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学者姓名：张志兴
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Abstract ：
Context: Ratoon rice relies on stubble axillary buds for secondary harvesting, but mechanical harvesting damages stubbles, while improper water and nitrogen management exacerbates nitrogen loss and yield instability. Objective: To alleviate rolling damage and improve the efficiency of bud-promoting fertilizer (BPF) in machineharvested low stubble ratoon rice (MHLR), crop management strategies were explored through yield formation and nitrogen loss assessments. Methods: A two-year, three-factor split-split plot experiment was conducted. Main plots were soil drying degree (Heavy drying, HD; Light drying, LD), subplots were main crop nitrogen management (Postponed nitrogen application; Traditional nitrogen), and sub-subplots were BPF rates (0, 45, 90 kg N ha-1). Results: Compared to traditional nitrogen application, postponed nitrogen application boosted root surface area (RSA) by 6.43 % and post - anthesis dry matter by 9.1 %, and increased main crop yield by 3.59 %. Postponed nitrogen application lessened dependence on BPF. Under PNN0 (HD, postponed nitrogen, 0 kg N ha-1 BPF), stubble quality and ratoon ability in the non - rolling zone did not decline significantly compared to NN90 (HD, traditional nitrogen, 90 kg N ha-1 BPF). Postponed nitrogen application enhanced the non - rolling zone' s ratoon yield by 6.18 %. In wet grain-filling years, HD improved the rolling zone' s ratoon crop yield by 36.31 %. BPF increased ratoon crop yield, but higher rates provided no further significant gains and even significantly increased total nitrogen losses. Notably, PNN0 achieved an annual yield comparable to that of NN90. Compared with NN90, PNN0 significantly reduced annual cumulative ammonia volatilization (31.11 %), N2O emissions (35.01 %), and nitrogen leaching loss (21.46 %). Results from the 1 5N fertilizer tracing indicated that, in comparison to NN90, PNN0 significantly enhanced the proportion of 1 5N fertilizer accumulated in plants by 21.20% and reduced the proportion of 1 5N fertilizer loss by 25.92%. Conclusion: Within MHLR systems, postponed nitrogen application combined with heavy soil drying and no BPF stabilized annual yield while minimizing nitrogen losses.
Keyword ：
Mechanized harvesting Mechanized harvesting Nitrogen losses Nitrogen losses Ratoon rice Ratoon rice Yield Yield
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| GB/T 7714 | Lan, Chaojie , Xu, Hailong , Qin, Bin et al. Optimizing water and nitrogen management to balance yield and nitrogen loss in mechanically harvested low-stubble ratoon rice [J]. | FIELD CROPS RESEARCH , 2026 , 336 . |
| MLA | Lan, Chaojie et al. "Optimizing water and nitrogen management to balance yield and nitrogen loss in mechanically harvested low-stubble ratoon rice" . | FIELD CROPS RESEARCH 336 (2026) . |
| APA | Lan, Chaojie , Xu, Hailong , Qin, Bin , Li, Jinying , Zhang, Bianhong , Zou, Jingnan et al. Optimizing water and nitrogen management to balance yield and nitrogen loss in mechanically harvested low-stubble ratoon rice . | FIELD CROPS RESEARCH , 2026 , 336 . |
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The ratoon rice cultivation system exhibits high-yield and low-emission characteristics, with carbon (C) sequestration and emissions in paddy fields being influenced by rhizosphere microorganisms. However, the relationship between these effects and microbial nutritional strategies remains unclear. This study utilized four rice varieties with distinct growth durations as materials to analyze the effects and mechanisms of yield formation, rhizosphere microbial dynamics, and net ecosystem carbon budget (NECB) in the main crop (MC), ratoon season rice (RSR), and single mid-late rice (LR) during 2023-2024. Results showed that the daily average yield of ratoon rice (MC+RSR) increased by 77.65 %-86.82 % compared to LR. Analysis of photosynthate allocation revealed that RSR exhibited 72.09 % and 77.35 % reductions in rhizodeposition compared to MC and LR, respectively. Analysis of microbial trophic strategies revealed a 55.54 % and 32.36 % increase in autotroph abundance in RSR relative to MC and LR. Investigation of greenhouse gas intensity (GHGI) and NECB confirmed that the ratoon rice system (MC+RSR) reduced its daily carbon emission index by 52.74 %-56.08 % compared to LR. The MC+RSR system acted as a carbon sink, sequestering 3.12-10.47 t CO2-eq ha-1 , whereas LR functioned as a carbon source, emitting 3.08-4.48 t CO2-eq ha-1 . Therefore, ratoon rice system extends the utilization period of light and thermal resources, enhances yield, and achieves carbon budget surplus. The increase in autotrophic bacteria and corresponding decrease in heterotrophic bacteria represent a critical rhizosphere microecological resilience response to soil carbon sequestration and emission reduction.
Keyword ：
Carbon balance surplus Carbon balance surplus Emission reduction Emission reduction Rhizosphere microecology Rhizosphere microecology Rice ratooning Rice ratooning
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| GB/T 7714 | Li, Jinying , Xu, Hailong , Qin, Bin et al. Mechanisms of high yield formation and carbon budget surplus in ratoon rice and its rhizosphere microecological responses [J]. | FIELD CROPS RESEARCH , 2025 , 333 . |
| MLA | Li, Jinying et al. "Mechanisms of high yield formation and carbon budget surplus in ratoon rice and its rhizosphere microecological responses" . | FIELD CROPS RESEARCH 333 (2025) . |
| APA | Li, Jinying , Xu, Hailong , Qin, Bin , Zhang, Bianhong , Chen, Mengying , Weng, Peiying et al. Mechanisms of high yield formation and carbon budget surplus in ratoon rice and its rhizosphere microecological responses . | FIELD CROPS RESEARCH , 2025 , 333 . |
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Rice paddies are a major, persistent source of atmospheric methane (CH4), emission rates depend on the partitioning of photosynthate carbon between the rice plant and the rhizosphere microbiome. Although ratoon season rice (RR) is shown to emit far less CH4 than main-crop rice (MC), the mechanisms have remained unresolved. This work conducts a 2-year field experiment in which RR is compared with MC and with late rice (LR) synchronized to the RR heading stage. Relative to MC and LR, RR lowers daily CH4 flux by 91%, raises daily grain yield by 34%-57%, and increases net economic return by 90%-136%. Mechanistically, 13C-labelling reveals that RR diverted more newly fixed carbon to the grain and less to the rhizosphere, thereby restricting acetate availability for methanogens. Rhizosphere metagenomics show reduced abundance of Methanobacteriaceae and down-regulation of methanogenic genes in RR. This carbon-reallocation pattern is underpinned by an abscisic acid (ABA)-mediated interaction between OsCIPK2 and OsSWEET1A, which simultaneously curtailed carbon efflux from roots and enhanced grain filling. This study is the first to establish a comprehensive framework of "ABA regulation-carbon allocation-microbial function-emission reduction and efficiency enhancement." It provides targetable strategies for carbon allocation and microbial management within climate-smart rice farming systems.
Keyword ：
distribution of photosynthate distribution of photosynthate methane emissions methane emissions methanogenic bacteria methanogenic bacteria ratoon season rice ratoon season rice yield yield
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| GB/T 7714 | Zou, Jingnan , Xu, Hailong , Qin, Bin et al. Ratoon Season Rice Reduces Methane Emissions by Limiting Acetic Acid Transport to the Rhizosphere and Inhibiting Methanogens [J]. | ADVANCED SCIENCE , 2025 . |
| MLA | Zou, Jingnan et al. "Ratoon Season Rice Reduces Methane Emissions by Limiting Acetic Acid Transport to the Rhizosphere and Inhibiting Methanogens" . | ADVANCED SCIENCE (2025) . |
| APA | Zou, Jingnan , Xu, Hailong , Qin, Bin , Lan, Chaojie , Li, Jinying , Zhang, Bianhong et al. Ratoon Season Rice Reduces Methane Emissions by Limiting Acetic Acid Transport to the Rhizosphere and Inhibiting Methanogens . | ADVANCED SCIENCE , 2025 . |
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The perennial rice (PR) cultivation system is an ecologically sustainable and environmentally-friendly approach that offers enhanced resource efficiency, thereby presenting the potential to supplant traditional double-cropping rice (DR) and ratoon rice (RR) systems in China's southeastern region. However, there is still a dearth of comprehensive studies examining the yield, carbon and nitrogen footprints, economic benefits, and carbon budget balance associated with PR. This study systematically compares the performance of PR, DR, and RR cultivation systems in terms of yield, direct greenhouse gas (GHG) emissions, carbon and nitrogen footprint, net ecological-economic benefits (NEEB), and net ecosystem carbon balance (NECB), based on field trials conducted from 2022 to 2024. The results from three years of research indicated that the annual yield of PR was comparable to that of DR and RR. However, PR exhibited a significant reduction in direct GHG emissions, which were 21.7 %-25.91 % lower than those of DR. Similarly, the carbon and nitrogen footprint of PR were reduced by 19.34 %-25.87 % and 7.12 %-9.17 %, respectively, while the carbon and nitrogen footprint per unit yield decreased by 16.76 %-28.02 % and 7.29 %-9.17 %. Additionally, the annual energy input of PR was reduced by 26.74 % and 2.10 % compared to DR and RR. In terms of economic benefits, the NEEB of PR was 83.24 % higher than that of DR and 10.85 % greater than that of RR. Furthermore, NECB of PR was significantly higher than that of DR and RR, with increases ranging from 15.77 % to 37.87 % and from 15.30 % to 43.45 %, respectively. These advantages were primarily attributed to reductions in methane emissions (CH4), ammonia volatilization (NH3), and lower indirect agricultural inputs. The findings suggest that despite the comparable yield of PR to that of DR and RR over the three-year trial, its significant advantages in terms of carbon and nitrogen footprints, energy input, and economic benefits indicate that PR represents a highly promising sustainable agricultural model for the southeastern region of China. It has the potential to maintain high productivity while reducing resource inputs and environmental pressures. In the future, further optimization of PR breeding and cultivation management may result in higher and more stable yields while maintaining low energy inputs and environmental costs.
Keyword ：
Carbon and nitrogen footprint Carbon and nitrogen footprint Net ecological-economic benefits Net ecological-economic benefits Perennial rice Perennial rice Rice cultivation systems Rice cultivation systems
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| GB/T 7714 | Xu, Hailong , Zhang, Bianhong , Qin, Bin et al. Evaluating the sustainability potential of perennial rice in southeastern China by comparing yield, environmental impacts and economic benefits [J]. | AGRICULTURE ECOSYSTEMS & ENVIRONMENT , 2025 , 390 . |
| MLA | Xu, Hailong et al. "Evaluating the sustainability potential of perennial rice in southeastern China by comparing yield, environmental impacts and economic benefits" . | AGRICULTURE ECOSYSTEMS & ENVIRONMENT 390 (2025) . |
| APA | Xu, Hailong , Zhang, Bianhong , Qin, Bin , Li, Jinying , Lan, Chaojie , Zou, Jingnan et al. Evaluating the sustainability potential of perennial rice in southeastern China by comparing yield, environmental impacts and economic benefits . | AGRICULTURE ECOSYSTEMS & ENVIRONMENT , 2025 , 390 . |
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Continuous improvement of rice breeding methods and consecutive innovation of cultivation technology in China has resulted in a significant increase in the proportion of ratooning rice planting mode. Therefore, ratoon rice has become a prominent rice planting pattern in China. This study reviewed the current situation and prospects regarding ratoon rice's high-yielding formation and physiological mechanisms. We focused on four key aspects: screening and breeding of ratoon rice cultivars, classification, determining suitable stubble height, and water and fertilizer management considerations for rice ratooning. Additionally, we delved into characteristics related to dry matter production and allocation in ratoon rice. This study also explored the regenerative activity and root vigor within the rhizosphere zone while evaluating their relationship with micro-ecological characteristics specific to ratoon rice. We propose the implementation of proper regulation precise over the rhizosphere environment aimed at scaling up sustainable progress in the realm of research, aimed at expanding the utilization of mechanized low-cut stubbles (< 25 cm) for the advancement of the ratoon rice sector. This process is essential for stimulating the availability of vital soil nutrients to promote timely sprouting axillary buds while facilitating tiller growth coordination along with bud elongation, collectively referred to as achieving 'four highs' (high regeneration coefficient, high effective panicle percentage, high harvest index, and high daily yield) alongside 'one low' (low carbon emission) for safe and sustainable development purposes. Furthermore, we have also put forward corresponding policy recommendations in light of the challenges encountered during the development process of the ratoon rice industry.
Keyword ：
Axillary bud sprout Axillary bud sprout C sequestration and mitigation C sequestration and mitigation Left stubble height Left stubble height Mechanization Mechanization Ratooning rice Ratooning rice Regeneration ability Regeneration ability
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| GB/T 7714 | Ting Chen , Peiying Weng , Chaojie Lan et al. Studies and prospectives of mechanically harvested ratooning rice in China [J]. | Technology in Agronomy , 2024 , 4 (e015) : 1-11 . |
| MLA | Ting Chen et al. "Studies and prospectives of mechanically harvested ratooning rice in China" . | Technology in Agronomy 4 . e015 (2024) : 1-11 . |
| APA | Ting Chen , Peiying Weng , Chaojie Lan , Fallah Nyumah , Chunlin Guo , Wenfang Lin et al. Studies and prospectives of mechanically harvested ratooning rice in China . | Technology in Agronomy , 2024 , 4 (e015) , 1-11 . |
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Ratoon rice utilizes the axillary buds sprouting from the remaining stubble of the main crop after harvest to form panicles, enabling a second harvest. However, mechanized harvesting often resulted in damage to the rice stubbles in the rolling zone, potentially leading to reduced yield. Enhancing the number of tillers in the rolling zone through optimized agronomic measures was crucial for achieving higher yield. However, research on water and fertilizer management corresponding to low stubble ratoon rice under mechanized harvesting was limited. A two-factor experiment was conducted to assess the impacts of water regimes (flooded, FL; alternate wetting and drying, AWD) and nitrogen fertilizer management (0 kg N ha-1, CK; Tiller promotion fertilizer 90 kg N ha-1, N; Delayed nitrogen application: Tiller promotion fertilizer 60 kg N ha-1 + Booting stage fertilizer 30 kg N ha-1, SN) on the yield formation, greenhouse gas emissions, and carbon footprint of low stubble ratoon rice. The results indicated significant effects of water regimes and nitrogen fertilizer on yield. Compared to N-FL, SN-AWD significantly increased average annual yield by 25.39%. The increment in tillers in the rolling zone ranged from 36.58% to 72.72% under AWD compared to flooding, and SN-AWD significantly increased the ratoon ability of the basal first and second nodes compared to N-FL. Soil quality index and ecosystem multifunctionality under SN-AWD increased by 32.37% and 9.05 times, respectively, compared to N-FL, resulting in significant increases in root length, root surface area, and root volume, consequently enhancing pre-anthesis and post-anthesis dry matter accumulation and ultimately improving yield. Although N2O emissions increased under SN-AWD compared to N-FL, CH4 cumulative emissions decreased significantly by 37.86% on average over two years, leading to a 23.02% reduction in total greenhouse gas emissions and a 38.62% reduction in carbon footprint. SN-AWD attained maximum net ecosystem economic benefit (NEEB), increasing by 35.42% compared to N-FL. Overall, the comprehensive analysis suggested that SN-AWD was a sustainable water and fertilizer management approach beneficial for balancing ratoon season yields, environmental footprint, and economic benefits. © 2024, The Authors. All rights reserved.
Keyword ：
Carbon footprint Carbon footprint Ecosystems Ecosystems Emission control Emission control Floods Floods Gas emissions Gas emissions Greenhouse gases Greenhouse gases Harvesting Harvesting Nitrogen fertilizers Nitrogen fertilizers Sustainable development Sustainable development Water conservation Water conservation
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| GB/T 7714 | Lan, Chaojie , Zou, Jingnan , Xu, Hailong et al. Enhanced Strategies for Water and Fertilizer Management to Optimize Yields and Promote Environmental Sustainability in the Mechanized Harvesting of Ratoon Rice in Southeast China [J]. | SSRN , 2024 . |
| MLA | Lan, Chaojie et al. "Enhanced Strategies for Water and Fertilizer Management to Optimize Yields and Promote Environmental Sustainability in the Mechanized Harvesting of Ratoon Rice in Southeast China" . | SSRN (2024) . |
| APA | Lan, Chaojie , Zou, Jingnan , Xu, Hailong , Qin, Bin , Li, Jinying , Chen, Ting et al. Enhanced Strategies for Water and Fertilizer Management to Optimize Yields and Promote Environmental Sustainability in the Mechanized Harvesting of Ratoon Rice in Southeast China . | SSRN , 2024 . |
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Abstract ：
Ratoon rice utilizes the axillary buds sprouting from the remaining stubble of the main crop after harvest to form panicles, enabling a second harvest. However, mechanized harvesting often resulted in damage to the rice stubbles in the rolling zone, potentially leading to reduced yield. Enhancing the number of tillers in the rolling zone through optimized agronomic measures was crucial for achieving higher yield. However, research on water and fertilizer management corresponding to low stubble ratoon rice under mechanized harvesting was limited. A two-factor experiment was conducted to assess the impacts of water regimes (flooded; alternate wetting and drying) and nitrogen fertilizer management (0 kg N ha(-1); Tiller promotion fertilizer 90 kg N ha(-1); Split nitrogen application: Tiller promotion fertilizer 60 kg N ha(-1) + Booting stage fertilizer 30 kg N ha(-1)) on the yield formation, greenhouse gas emissions, and carbon footprint of low stubble ratoon rice. The results indicated significant effects of water regimes and nitrogen fertilizer on yield. Compared to single application of tillerpromoting fertilizer coupled with continuous flooding (N-FL), Split application of tiller-promoting fertilizer coupled with alternate wetting and drying (SN-AWD) significantly increased average annual yield by 25.4%. SNAWD significantly increased the ratoon ability of the basal first and second nodes compared to N-FL. The soil quality index and ecosystem multifunctionality under SN-AWD increased by an average of 32.37% and 10.16 times, respectively, compared to N-FL. This increase resulted in significant enhancements in root length and root surface area, consequently improving pre-anthesis and post-anthesis dry matter accumulation and ultimately enhancing yield. Although N2O emissions increased under SN-AWD compared to N-FL, CH4 cumulative emissions decreased significantly by 37.86% on average over two years, leading to a 23.02% reduction in total greenhouse gas emissions and a 38.62% reduction in carbon footprint per unit grain. SN-AWD attained maximum net ecosystem economic benefit (NEEB), increasing by 35.42% compared to N-FL. Overall, the comprehensive analysis suggested that SN-AWD was a sustainable water and fertilizer management approach beneficial for balancing ratoon season yields, environmental footprint, and economic benefits.
Keyword ：
Axillary bud Axillary bud Carbon footprint Carbon footprint Greenhouse gas emissions Greenhouse gas emissions Ratoon rice Ratoon rice Yield Yield
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| GB/T 7714 | Lan, Chaojie , Zou, Jingnan , Xu, Hailong et al. Enhanced strategies for water and fertilizer management to optimize yields and promote environmental sustainability in the mechanized harvesting of ratoon rice in Southeast China [J]. | AGRICULTURAL WATER MANAGEMENT , 2024 , 302 . |
| MLA | Lan, Chaojie et al. "Enhanced strategies for water and fertilizer management to optimize yields and promote environmental sustainability in the mechanized harvesting of ratoon rice in Southeast China" . | AGRICULTURAL WATER MANAGEMENT 302 (2024) . |
| APA | Lan, Chaojie , Zou, Jingnan , Xu, Hailong , Qin, Bin , Li, Jinying , Chen, Ting et al. Enhanced strategies for water and fertilizer management to optimize yields and promote environmental sustainability in the mechanized harvesting of ratoon rice in Southeast China . | AGRICULTURAL WATER MANAGEMENT , 2024 , 302 . |
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Although thousands of genes have been identified or cloned in rice (Oryza sativa) in the last two decades, the majority of them have only been separately characterized in specific varieties or single-gene modified backgrounds, thus limiting their practical application. We developed an optimized multiplex genome editing (MGE) toolbox that can efficiently assemble and stably express up to twelve sgRNA targets in a single plant expression vector. In this study, we established the MGE-based Rapid Directional Improvement (MRDI) strategy for directional improvement of complex agronomic traits in one small-scale rice transformation. This approach provides a rapid and practical procedure, encompassing sgRNA assembly, transgene-free screening and the creation of promising germplasm, by combining the precision of gene editing with phenotype-based field breeding. The MRDI strategy was used to generate the full diversity of twelve main agronomic genes in rice cultivar FXZ for the directional improvement of its growth duration and plant architecture. After applying the MRDI to FXZ, ideal plants with the desired traits of early heading date reduced plant height, and more effective panicles were generated without compromising yield, blast resistance and grain quality. Furthermore, the results of whole-genome sequencing (WGS), including the analysis of structural variations (SVs) and single nucleotide variations (SNVs) in the MGE plants, confirmed the high specificity and low frequency of unwanted mutations associated with this strategy. The MRDI breeding strategy would be a robust approach for exploring and applying crucial agronomic genes, as well as for generating novel elite germplasm in the future.
Keyword ：
heading date heading date multiplex genome editing multiplex genome editing plant architecture plant architecture rapid directional improvement rapid directional improvement rice rice
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| GB/T 7714 | Wei, Yidong , Zhang, Haomin , Fan, Jiaxing et al. Multiplex-genome-editing based rapid directional improvement of complex traits in rice [J]. | PLANT BIOTECHNOLOGY JOURNAL , 2024 , 22 (9) : 2624-2628 . |
| MLA | Wei, Yidong et al. "Multiplex-genome-editing based rapid directional improvement of complex traits in rice" . | PLANT BIOTECHNOLOGY JOURNAL 22 . 9 (2024) : 2624-2628 . |
| APA | Wei, Yidong , Zhang, Haomin , Fan, Jiaxing , Cai, Qiuhua , Zhang, Zhixing , Wang, Jinlan et al. Multiplex-genome-editing based rapid directional improvement of complex traits in rice . | PLANT BIOTECHNOLOGY JOURNAL , 2024 , 22 (9) , 2624-2628 . |
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Grain-filling of rice spikelets (particularly for the later flowering inferior spikelets) is an important characteristic that affects both quality and yield. Rice ratooning technology is used to cultivate a second crop from dormant buds that sprout from stubble left after the first harvest. This study used two rice varieties, the conventional indica rice 'Jinhui 809' and the hybrid indica-japonica rice 'Yongyou 1540', to assess the impact of rice ratooning on grain-filling. The results indicated that the grain-filling process in inferior spikelets of ratoon season rice (ISR) showed significant improvement compared to inferior spikelets of main crop (late season) rice (ISL). This improvement was evident in the earlier onset of rapid grain-filling, higher seed-setting percentage, and improved grain quality. A label-free quantitative proteomic analysis using mass spectrometry identified 1724 proteins with significant abundance changes, shedding light on the molecular mechanisms behind the improved grain-filling in ISR. The functional analysis of these proteins indicated that ratooning stimulated the metabolic processes of sucrose-starch, trehalose, and hormones in rice inferior spikelets, leading to enhanced enzyme activities related to starch synthesis, elevated concentrations of trehalose-6-phosphate (T6P), indole-3-acetic acid (IAA) and zeatin riboside (ZR) during the active grain-filling phase. This research highlighted the importance of the GF14f protein as a key regulator in the grain-filling process of ISR. It revealed that GF14f transcriptional and protein levels declined more rapidly in ISR compared to ISL during grain-filling. Additionally, the GF14f-RNAi plants specific to the endosperm exhibited improved quality in inferior spikelets. These findings suggest that the enhancement of starch synthesis, increased levels of IAA, ZR, and T6P, along with the rapid decrease in GF14f protein, play a role in enhancing grain-filling in ratoon season rice.
Keyword ：
GF14f protein GF14f protein Grain-filling Grain-filling Grain quality Grain quality Proteome Proteome Rice ratooning Rice ratooning Starch synthesis Starch synthesis
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| GB/T 7714 | Zeng, Yuhang , Zi, Hongjuan , Wang, Zhaocheng et al. Comparative Proteomic Analysis Provides New Insights into Improved Grain-filling in Ratoon Season Rice [J]. | RICE , 2024 , 17 (1) . |
| MLA | Zeng, Yuhang et al. "Comparative Proteomic Analysis Provides New Insights into Improved Grain-filling in Ratoon Season Rice" . | RICE 17 . 1 (2024) . |
| APA | Zeng, Yuhang , Zi, Hongjuan , Wang, Zhaocheng , Min, Xiumei , Chen, Mengying , Zhang, Bianhong et al. Comparative Proteomic Analysis Provides New Insights into Improved Grain-filling in Ratoon Season Rice . | RICE , 2024 , 17 (1) . |
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Crop roots are colonized by large numbers of microorganisms, collectively known as the root-microbiome, which modulate plant growth, development and contribute to elemental nutrient uptake. In conditions of nitrogen limitation, the over-expressed Calcineurin B-like interacting protein kinase 2 (OsCIPK2) gene with root-specific promoter (RC) has been shown to enhance growth and nitrogen uptake in rice. Analysis of root-associated bacteria through high-throughput sequencing revealed that OsCIPK2 has a significant impact on the diversity of the root microbial community under low nitrogen stress. The quantification of nifH gene expression demonstrated a significant enhancement in nitrogen-fixing capabilities in the roots of RC transgenetic rice. Synthetic microbial communities (SynCom) consisting of six nitrogen-fixing bacterial strains were observed to be enriched in the roots of RC, leading to a substantial improvement in rice growth and nitrogen uptake in nitrogen-deficient soils. Forty and twenty-three metabolites exhibiting differential abundance were identified in the roots and rhizosphere soils of RC transgenic rice compared to wild-type (WT) rice. These findings suggest that OSCIPK2 plays a role in restructuring the microbial community in the roots through the regulation of metabolite synthesis and secretion. Further experiments involving the exogenous addition of citric acid revealed that an optimal concentration of this compound facilitated the growth of nitrogen-fixing bacteria and substantially augmented their population in the soil, highlighting the importance of citric acid in promoting nitrogen fixation under conditions of low nitrogen availability. These findings suggest that OsCIPK2 plays a role in enhancing nitrogen uptake by rice plants from the soil by influencing the assembly of root microbial communities, thereby offering valuable insights for enhancing nitrogen utilization in rice cultivation.
Keyword ：
Metabolites Metabolites Nitrogen uptake Nitrogen uptake OsCIPK2 OsCIPK2 Rhizosphere soil Rhizosphere soil Root microbiome Root microbiome Synthetic microbial communities Synthetic microbial communities
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| GB/T 7714 | Chen, Mengying , Feng, Shizhong , Lv, He et al. OsCIPK2 mediated rice root microorganisms and metabolites to improve plant nitrogen uptake [J]. | BMC PLANT BIOLOGY , 2024 , 24 (1) . |
| MLA | Chen, Mengying et al. "OsCIPK2 mediated rice root microorganisms and metabolites to improve plant nitrogen uptake" . | BMC PLANT BIOLOGY 24 . 1 (2024) . |
| APA | Chen, Mengying , Feng, Shizhong , Lv, He , Wang, Zewen , Zeng, Yuhang , Shao, Caihong et al. OsCIPK2 mediated rice root microorganisms and metabolites to improve plant nitrogen uptake . | BMC PLANT BIOLOGY , 2024 , 24 (1) . |
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