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转座子倒置重复序列在平衡玉米抗旱性和产量相关性状中的作用
作者:小柯机器人 发布时间:2022/10/14 19:03:21

华中农业大学Mingqiu Dai,Feng Li和Lin Li等研究人员共同合作近期取得重要工作进展,他们研究发现了转座子倒置重复序列在平衡玉米抗旱性和产量相关性状中的作用。相关论文2022年10月13日在线发表于《自然—生物技术》杂志上。

研究人员对玉米干旱和潮湿条件下的小RNA转录组(sRNAome)和转录组概况进行了全基因组分析,并发现了数十个环境特异性调节热点。8号染色体上干旱相关环境特异性超级eQTL热点(DRESH8)和DRESH8衍生的小干扰RNA靶点ZmMYBR38的转基因和分子研究,揭示了一个转座元件介导的倒置重复序列(TE-IR)衍生的sRNA和基因调节网络,它平衡了植物耐旱性和产量的相关性状。

一项全基因组分析显示,TE-IRs与干旱反应和产量相关的性状有关,在玉米驯化过程中被正向选择和扩展。这些结果表明,TE-IR介导的转录后调控是作物环境适应和产量相关性状之间权衡的一个关键分子机制,为培育耐胁迫能力更强但产量不受影响的作物提供了潜在的基因组靶点。

据介绍,目前对于玉米环境适应性和产量相关性状的选择所依据的基因组基础仍然知之甚少。

附:英文原文

Title: The role of transposon inverted repeats in balancing drought tolerance and yield-related traits in maize

Author: Sun, Xiaopeng, Xiang, Yanli, Dou, Nannan, Zhang, Hui, Pei, Surui, Franco, Arcadio Valdes, Menon, Mitra, Monier, Brandon, Ferebee, Taylor, Liu, Tao, Liu, Sanyang, Gao, Yuchi, Wang, Jubin, Terzaghi, William, Yan, Jianbing, Hearne, Sarah, Li, Lin, Li, Feng, Dai, Mingqiu

Issue&Volume: 2022-10-13

Abstract: The genomic basis underlying the selection for environmental adaptation and yield-related traits in maize remains poorly understood. Here we carried out genome-wide profiling of the small RNA (sRNA) transcriptome (sRNAome) and transcriptome landscapes of a global maize diversity panel under dry and wet conditions and uncover dozens of environment-specific regulatory hotspots. Transgenic and molecular studies of Drought-Related Environment-specific Super eQTL Hotspot on chromosome 8 (DRESH8) and ZmMYBR38, a target of DRESH8-derived small interfering RNAs, revealed a transposable element-mediated inverted repeats (TE-IR)-derived sRNA- and gene-regulatory network that balances plant drought tolerance with yield-related traits. A genome-wide scan revealed that TE-IRs associate with drought response and yield-related traits that were positively selected and expanded during maize domestication. These results indicate that TE-IR-mediated posttranscriptional regulation is a key molecular mechanism underlying the tradeoff between crop environmental adaptation and yield-related traits, providing potential genomic targets for the breeding of crops with greater stress tolerance but uncompromised yield.

DOI: 10.1038/s41587-022-01470-4

Source: https://www.nature.com/articles/s41587-022-01470-4

期刊信息

Nature Biotechnology:《自然—生物技术》,创刊于1996年。隶属于施普林格·自然出版集团,最新IF:31.864
官方网址:https://www.nature.com/nbt/
投稿链接:https://mts-nbt.nature.com/cgi-bin/main.plex