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学者姓名：徐钟天
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Abstract ：
<正>槟榔（Areca catechu L.）黄化病（yellow leaf disease, YLD）于1914年首次在印度报道，1981年在海南省屯昌县发现
Keyword ：
areca palm latent totivirus areca palm latent totivirus ORFan ORFan RNA-dependent RNA polymerase RNA-dependent RNA polymerase Totivirus Totivirus
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| GB/T 7714 | 肖思云 , 牛晓庆 , 徐钟天 et al. 海南槟榔潜隐单组分病毒1的分子进化特征分析 [J]. | 植物病理学报 , 2025 , 55 (03) : 550-554 . |
| MLA | 肖思云 et al. "海南槟榔潜隐单组分病毒1的分子进化特征分析" . | 植物病理学报 55 . 03 (2025) : 550-554 . |
| APA | 肖思云 , 牛晓庆 , 徐钟天 , 田雨菁 , 谢源 , 杜振国 et al. 海南槟榔潜隐单组分病毒1的分子进化特征分析 . | 植物病理学报 , 2025 , 55 (03) , 550-554 . |
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Areca palm velarivirus 1 (APV1), the causal agent of yellow leaf disease (YLD), poses a serious threat to the economically important areca palm industry in the Hainan Province, China, yet its evolutionary dynamics remain poorly understood. Here, we performed a large-scale molecular survey by sequencing the coat protein (CP) gene from 364 APV1-infected samples collected across major cultivation regions of Hainan. Population genetic analyses revealed extremely high haplotype diversity (Hd = 0.997) but very low nucleotide diversity (pi = 0.017). Neutrality tests (Tajima's D = -2.266; Fu's FS = -23.697) and a unimodal mismatch distribution supported a scenario of recent demographic expansion from a restricted ancestral pool. Evolutionary analyses indicated that the CP gene is subject to strong purifying selection, although eight codons exhibited episodic positive selection, suggesting ongoing viral adaptation. Furthermore, we identified three distinct genetic clusters with significant geographic structuring, indicating that viral dissemination is shaped by local factors. Together, these results reveal a recent explosive invasion of APV1 characterized by rapid island-wide expansion and emerging local differentiation. This work provides novel insights into the evolutionary trajectory of APV1 and establishes a genomic basis for improved surveillance and management of YLD.
Keyword ：
areca palm areca palm areca palm velarivirus 1 areca palm velarivirus 1 demographic expansion demographic expansion genetic diversity genetic diversity natural selection natural selection population structure population structure
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| GB/T 7714 | Niu, Xiaoqing , Xu, Zhongtian , Lin, Zhaowei et al. Population Genetic Analysis Reveals Recent Demographic Expansion and Local Differentiation of Areca Palm Velarivirus 1 in Hainan Island [J]. | PLANTS-BASEL , 2025 , 14 (19) . |
| MLA | Niu, Xiaoqing et al. "Population Genetic Analysis Reveals Recent Demographic Expansion and Local Differentiation of Areca Palm Velarivirus 1 in Hainan Island" . | PLANTS-BASEL 14 . 19 (2025) . |
| APA | Niu, Xiaoqing , Xu, Zhongtian , Lin, Zhaowei , Tang, Qinghua , Du, Zhenguo , Gao, Fangluan . Population Genetic Analysis Reveals Recent Demographic Expansion and Local Differentiation of Areca Palm Velarivirus 1 in Hainan Island . | PLANTS-BASEL , 2025 , 14 (19) . |
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Yellow leaf disease (YLD) poses a significant challenge to areca palm cultivation, yet its etiology remains uncertain. During our investigation of YLD-affected areca palm plants, transcriptome sequencing revealed an RNA contig exhibiting striking similarities to the RNA-dependent RNA polymerase (RdRp) of ormycoviruses. Subsequent gene cloning techniques yielded the full-length sequence of this RNA, potentially representing either the complete or partial genome of a hitherto unidentified ormycovirus, tentatively named areca palm yellow leaf-associated ormycovirus (APYLaOMV). RT-PCR detection found that APYLaOMV is present in over 30% of YLD-affected areca palm samples but is absent in healthy ones, suggesting a potential link between APYLaOMV and YLD. In summary, these data could be valuable in understanding the etiology of YLD in areca palms.
Keyword ：
areca palm areca palm ORFan ORFan ormycovirus ormycovirus RNA-dependent RNA polymerase RNA-dependent RNA polymerase
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| GB/T 7714 | Niu, Xiaoqing , Xu, Zhongtian , Tian, Yujing et al. A Putative Ormycovirus That Possibly Contributes to the Yellow Leaf Disease of Areca Palm [J]. | FORESTS , 2024 , 15 (6) . |
| MLA | Niu, Xiaoqing et al. "A Putative Ormycovirus That Possibly Contributes to the Yellow Leaf Disease of Areca Palm" . | FORESTS 15 . 6 (2024) . |
| APA | Niu, Xiaoqing , Xu, Zhongtian , Tian, Yujing , Xiao, Siyun , Xie, Yuan , Du, Zhenguo et al. A Putative Ormycovirus That Possibly Contributes to the Yellow Leaf Disease of Areca Palm . | FORESTS , 2024 , 15 (6) . |
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The small brown planthopper, Laodelphax striatellus (Hemiptera: Delphacidae), is an efficient vector of several economically important plant viruses. In this study, a novel reovirus-like virus was identified in L. striatellus, named Laodelphax striatellus reovirus (LSRV). The complete genome of LSRV was 28,207 nt, comprising of ten segments encoded 11 deduced proteins. All genome segments were conserved with AGUAA at the 5 & PRIME;-terminal and GUUGUC at 3 & PRIME;-terminal and segment-specific inverted terminal repeats. In addition, genomic characteristics and phylogenetic analysis suggested that LSRV was a new member of genus Fijivirus. Importantly, LSRV was widely distributed in various tissues and highest expressed in adult heads. However, LSRV was unable to horizontal replication in rice plants. Moreover, typical profiles of LSRV-derived small interfering RNAs indicated host antiviral RNA interference pathway was involved in LSRV infection. In conclusion, LSRV may be considered as a new species of the genus Fijivirus in the order Reovirales.
Keyword ：
Fijivirus Fijivirus Insect-specific reovirus Insect-specific reovirus Laodelphax striatellus Laodelphax striatellus Laodelphax striatellus reovirus Laodelphax striatellus reovirus
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| GB/T 7714 | Lu, Gang , Zhang, Xiao-Di , Xu, Zhong-Tian et al. Complete sequence and genetic characterization of a novel insect-specific reovirus discovered from Laodelphax striatellus [J]. | VIROLOGY , 2022 , 570 : 117-122 . |
| MLA | Lu, Gang et al. "Complete sequence and genetic characterization of a novel insect-specific reovirus discovered from Laodelphax striatellus" . | VIROLOGY 570 (2022) : 117-122 . |
| APA | Lu, Gang , Zhang, Xiao-Di , Xu, Zhong-Tian , Ye, Zhuang-Xin , Zhang, Yan , Chen, Jian-Ping et al. Complete sequence and genetic characterization of a novel insect-specific reovirus discovered from Laodelphax striatellus . | VIROLOGY , 2022 , 570 , 117-122 . |
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BackgroundPlants are naturally associated with root microbiota, which are microbial communities influential to host fitness. Thus, it is important to understand how plants control root microbiota. Epigenetic factors regulate the readouts of genetic information and consequently many essential biological processes. However, it has been elusive whether RNA-directed DNA methylation (RdDM) affects root microbiota assembly.ResultsBy applying 16S rRNA gene sequencing, we investigated root microbiota of Arabidopsis mutants defective in the canonical RdDM pathway, including dcl234 that harbors triple mutation in the Dicer-like proteins DCL3, DCL2, and DCL4, which produce small RNAs for RdDM. Alpha diversity analysis showed reductions in microbe richness from the soil to roots, reflecting the selectivity of plants on root-associated bacteria. The dcl234 triple mutation significantly decreases the levels of Aeromonadaceae and Pseudomonadaceae, while it increases the abundance of many other bacteria families in the root microbiota. However, mutants of the other examined key players in the canonical RdDM pathway showed similar microbiota as Col-0, indicating that the DCL proteins affect root microbiota in an RdDM-independent manner. Subsequently gene analysis by shotgun sequencing of root microbiome indicated a selective pressure on microbial resistance to plant defense in the dcl234 mutant. Consistent with the altered plant-microbe interactions, dcl234 displayed altered characters, including the mRNA and sRNA transcriptomes that jointly highlighted altered cell wall organization and up-regulated defense, the decreased cellulose and callose deposition in root xylem, and the restructured profile of root exudates that supported the alterations in gene expression and cell wall modifications.ConclusionOur findings demonstrate an important role of the DCL proteins in influencing root microbiota through integrated regulation of plant defense, cell wall compositions, and root exudates. Our results also demonstrate that the canonical RdDM is dispensable for Arabidopsis root microbiota. These findings not only establish a connection between root microbiota and plant epigenetic factors but also highlight the complexity of plant regulation of root microbiota.
Keyword ：
Cell wall Cell wall DCL DCL Defense Defense Microbiome Microbiome RNA-directed DNA methylation RNA-directed DNA methylation Root microbiota Root microbiota Small RNA Small RNA
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| GB/T 7714 | Kaushal, Richa , Peng, Li , Singh, Sunil K. et al. Dicer-like proteins influence Arabidopsis root microbiota independent of RNA-directed DNA methylation [J]. | MICROBIOME , 2021 , 9 (1) . |
| MLA | Kaushal, Richa et al. "Dicer-like proteins influence Arabidopsis root microbiota independent of RNA-directed DNA methylation" . | MICROBIOME 9 . 1 (2021) . |
| APA | Kaushal, Richa , Peng, Li , Singh, Sunil K. , Zhang, Mengrui , Zhang, Xinlian , Vilchez, Juan, I et al. Dicer-like proteins influence Arabidopsis root microbiota independent of RNA-directed DNA methylation . | MICROBIOME , 2021 , 9 (1) . |
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Abstract ：
稻飞虱是水稻主要害虫,能够传播多种水稻病毒,严重威胁亚洲水稻生产.稻飞虱主要包括灰飞虱、褐飞虱和白背飞虱.灰飞虱传播水稻黑条矮缩病毒和水稻条纹病毒,褐飞虱传播水稻齿叶矮缩病毒和水稻草矮病毒,白背飞虱传播南方水稻黑条矮缩病毒.本文介绍了3种稻飞虱的基本特性及5种水稻病毒的基因功能和致病特征,详细阐述了稻飞虱与水稻病毒的互作机制,总结了病毒在稻飞虱体内的传播路线及传播障碍,为综合防控稻飞虱传播的水稻病毒病提供参考.
Keyword ：
互作 互作 分子机制 分子机制 水稻病毒 水稻病毒 病毒传播 病毒传播 稻飞虱 稻飞虱
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| GB/T 7714 | 赖坤龙 , 王海峰 , 徐钟天 et al. 稻飞虱传播水稻病毒机制的研究进展 [J]. | 福建农林大学学报(自然科学版) , 2021 , 50 (05) : 577-587 . |
| MLA | 赖坤龙 et al. "稻飞虱传播水稻病毒机制的研究进展" . | 福建农林大学学报(自然科学版) 50 . 05 (2021) : 577-587 . |
| APA | 赖坤龙 , 王海峰 , 徐钟天 , 崔娜 . 稻飞虱传播水稻病毒机制的研究进展 . | 福建农林大学学报(自然科学版) , 2021 , 50 (05) , 577-587 . |
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