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

信息来源:     发布时间:2022-10-14

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


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.

全文链接:https://www.nature.com/articles/s41587-022-01470-4

 


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