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学者姓名：李胜兰
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Abstract ：
To better understand the effects of ground-level ozone (O3) on nutrients and stoichiometry in different plant organs, urban tree species Celtis sinensis, Cyclocarya paliurus, Quercus acutissima, and Quercus nuttallii were subjected to a constant exposure to charcoal-filtered air (CF), nonfiltered air (NF), or NF + 40, 60, or 80 nmol O3 mol-1 (NF40, NF60, and NF80) starting early in the summer of the growing season. At the end of summer, net CO2 assimilation rate (A), stomatal conductance (gs), leaf mass per area (LMA), and/or leaf greenness (SPAD) either were not significantly affected by elevated O3 or were even higher in some cases during the summer compared with the CF or NF controls. LMA was significantly lower in autumn only after the highest O3 exposures. Compared to NF, NF40 caused a large increase in gs across species in late summer and more K and Mn in stems. At the end of the growing season, nutrient status and stoichiometric ratios in different organs were variously altered under O3 stress; many changes were large and often species-specific. Across O3 treatments, LMA was primarily associated with C and Mg levels in leaves and Ca levels in leaves and stems. NF40 enriched K, P, Fe, and Mn in stems, relative to NF, and NF60 enhanced Ca in leaves relative to CF and NF40. Moreover, NF resulted in a higher Ca/Mg ratio in leaves of Q. acutissima only, relative to the other O3 regimes. Interestingly, across species, O3 stress led to different nutrient modifications in different organs (stems + branches vs leaves). Thus, ambient and/or elevated O3 exposures can alter the dynamics and distribution of nutrients and disrupt stoichiometry in different organs in a species-specific manner. Changes in stoichiometry reflect an important defense mechanism in plants under O3, and O3 pollution adds more risk to ecological stoichiometries in urban areas.
Keyword ：
Air pollution Air pollution Ground-level ozone Ground-level ozone Micronutrients Micronutrients Nutrient cycling Nutrient cycling Urban green Urban green
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| GB/T 7714 | Zhang, Kun , Li, Shenglan , Li, Shuangjiang et al. Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass [J]. | JOURNAL OF FORESTRY RESEARCH , 2025 , 36 (1) . |
| MLA | Zhang, Kun et al. "Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass" . | JOURNAL OF FORESTRY RESEARCH 36 . 1 (2025) . |
| APA | Zhang, Kun , Li, Shenglan , Li, Shuangjiang , Shang, Bo , Saitanis, Costas J. , Xu, Yansen et al. Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass . | JOURNAL OF FORESTRY RESEARCH , 2025 , 36 (1) . |
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Abstract ：
White lupin (Lupinus albus L.) produces cluster roots to acquire more phosphorus under phosphorus deficiency. Bacillus amyloliquefaciens SQR9 contributes to plant growth, but whether and how it promotes cluster root formation in white lupin remain unclear. Here, we investigated the roles of SQR9 in cluster root formation under low phosphorus conditions using a microbial mutant and virus-induced gene silencing (VIGS) in white lupin. SQR9 substantially enhanced cluster root formation under low phosphorus conditions. The ysnE gene encodes an auxin biosynthesis enzyme in SQR9 and was associated with cluster root formation, as ysnE-defective SQR9 did not trigger cluster root formation. SQR9 inoculation induced the expression of PIN-formed2 (LaPIN2, encoding an auxin transporter) and YUCCA4 (LaYUC4, encoding an auxin biosynthesis enzyme) in white lupin roots. VIGS-mediated knockdown of LaPIN2 and LaYUC4 prevented wild-type SQR9-induced cluster root formation in white lupin. Finally, white lupin LaYUC4-derived auxin and SQR9-derived auxin pools were both transported by LaPIN2, promoting cluster root formation under low phosphorus conditions. Taken together, we propose that B. amyloliquefaciens promotes cluster root formation in white lupin under low phosphorus conditions by stimulating auxin biosynthesis and transport. Our results provide insights into the interplay between bacteria and root auxin in crop phosphorus use efficiency. Bacillus amyloliquefaciens produces auxin and promotes auxin biosynthesis in white lupin under low phosphorus conditions, triggering cluster root formation.
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| GB/T 7714 | Yang, Jinyong , Li, Shenglan , Zhou, Xiangxue et al. Bacillus amyloliquefaciens promotes cluster root formation of white lupin under low phosphorus by mediating auxin levels [J]. | PLANT PHYSIOLOGY , 2025 , 197 (2) . |
| MLA | Yang, Jinyong et al. "Bacillus amyloliquefaciens promotes cluster root formation of white lupin under low phosphorus by mediating auxin levels" . | PLANT PHYSIOLOGY 197 . 2 (2025) . |
| APA | Yang, Jinyong , Li, Shenglan , Zhou, Xiangxue , Du, Chongxuan , Fang, Ju , Li, Xing et al. Bacillus amyloliquefaciens promotes cluster root formation of white lupin under low phosphorus by mediating auxin levels . | PLANT PHYSIOLOGY , 2025 , 197 (2) . |
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| GB/T 7714 | Zhang, Kun , Li, Shenglan , Li, Shuangjiang et al. Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass (vol 36, 29, 2025) [J]. | JOURNAL OF FORESTRY RESEARCH , 2025 , 36 (1) . |
| MLA | Zhang, Kun et al. "Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass (vol 36, 29, 2025)" . | JOURNAL OF FORESTRY RESEARCH 36 . 1 (2025) . |
| APA | Zhang, Kun , Li, Shenglan , Li, Shuangjiang , Shang, Bo , Saitanis, Costas J. , Xu, Yansen et al. Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass (vol 36, 29, 2025) . | JOURNAL OF FORESTRY RESEARCH , 2025 , 36 (1) . |
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Extreme heat and elevated ozone (O3) significantly affect plant growth and secondary metabolism, including biogenic volatile organic compound (BVOC) emissions. However, the impact of the extreme heat events (EHs) on the O3-induced BVOC emissions remains unclear. Here, Quercus nuttallii(an isoprene emitter) and Q. acutissima (a monoterpene emitter) were exposed to five O3 treatments for three months and subjected to a two-week EH. The emission rates of isoprene and monoterpenes, their synthesis capacities, and reactive oxygen species (ROS) levels were determined to investigate how heat stress modulates O3 effects. Both BVOC types showed a hormetic response to O3, with low doses of O3 stimulating emissions and high doses suppressing them. Isoprene (Hedges'g = 2.91) and monoterpene (Hedges'g = 2.52) emission rates were inhibited by short-term EH across the five O3 treatments. However, isoprene emission rates generally recovered during the post-EH period, except under the highest O3 exposure (NF80). EH also shifted isoprene's response to O3 from being synthesis-driven to ROS-driven. Although the monoterpene emission rate response to O3 was driven by synthesis capacity in the pre-EH period, this response became less explainable by either factor post-EH. These findings emphasize the profound effects of EH on the BVOC response to O3, providing crucial insights for predicting regional BVOC emissions under future climate scenarios.
Keyword ：
air pollution air pollution ecologicaltrade-off ecologicaltrade-off hormetic response hormetic response isoprene emission isoprene emission monoterpene emission monoterpene emission
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| GB/T 7714 | Li, Shuangjiang , Yuan, Xiangyang , Li, Shenglan et al. Extreme Heat Event Alters BVOC Responses to Elevated Ozone: From Physiology to Emission Patterns [J]. | ENVIRONMENTAL SCIENCE & TECHNOLOGY , 2025 , 59 (24) : 12132-12144 . |
| MLA | Li, Shuangjiang et al. "Extreme Heat Event Alters BVOC Responses to Elevated Ozone: From Physiology to Emission Patterns" . | ENVIRONMENTAL SCIENCE & TECHNOLOGY 59 . 24 (2025) : 12132-12144 . |
| APA | Li, Shuangjiang , Yuan, Xiangyang , Li, Shenglan , Zhou, Yuqing , Wang, Shenglei , Zhang, Kun et al. Extreme Heat Event Alters BVOC Responses to Elevated Ozone: From Physiology to Emission Patterns . | ENVIRONMENTAL SCIENCE & TECHNOLOGY , 2025 , 59 (24) , 12132-12144 . |
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Surface ozone (O3) 3 ) poses a significant threat to urban vegetation health, and assessing the O3 3 risk across woody species is of vital importance for maintaining the health of urban infrastructure. In the present study, Jarvis-type stomatal conductance model was parameterized for ten urban species in northern China. Incorporating the effects of time of day and diurnal O3 3 concentration significantly enhanced the model performance. For different plant functional types (greening trees, greening shrubs, and orchard-grown trees), three parameterizations were established to estimate stomatal O3 3 uptake (POD1, 1 , phytotoxic O3 3 dose over an hourly threshold of 1 nmol m- 2 s-1).-1 ). The differences in POD1 1 between greening trees and shrubs were primarily due to the difference in their stomatal sensitivity to light. Orchard-grown trees displayed the lowest O3 3 removal capacity (lowest value of POD1) 1 ) because of their shorter growing season despite of high stomatal conductance. These results indicated that plant phenology and light responsiveness determined stomatal O3 3 uptake, and the three parameterizations developed here could be applicable to various urban species in northern regions. Among climatic factors for O3 3 risk assessment, O3 3 concentration was the most important factor determining annual variation of POD1, 1 , which was primarily driven by air temperature. However, when O3 3 pollution decreased, O3 3 concentration exhibited less dependence on temperature and more dependence on light. These findings provide crucial insights for urban policy-makers and environmental scientists aiming to mitigate O3 3 pollution effects and enhance urban vegetation health.
Keyword ：
Functional type Functional type North China North China Ozone Ozone Stomatal ozone uptake Stomatal ozone uptake Urban trees Urban trees
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| GB/T 7714 | Li, Shenglan , Ma, Yanze , Yang, Xilai et al. Phenology- and light-based parameterization of stomatal conductance model for urban woody species in northern China [J]. | ENVIRONMENTAL RESEARCH , 2024 , 260 . |
| MLA | Li, Shenglan et al. "Phenology- and light-based parameterization of stomatal conductance model for urban woody species in northern China" . | ENVIRONMENTAL RESEARCH 260 (2024) . |
| APA | Li, Shenglan , Ma, Yanze , Yang, Xilai , Zhang, Lei , Xu, Yan , Yuan, Xiangyang et al. Phenology- and light-based parameterization of stomatal conductance model for urban woody species in northern China . | ENVIRONMENTAL RESEARCH , 2024 , 260 . |
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