204-02-21 ワシントン大学セントルイス校
◆研究者は、東南アジアの野生米の進化に雑草イネとの交雑が大きく貢献していることを報告した。米農家は、これらの雑草が栽培米との交雑によって有利になるように進化しており、例えば野生米遺伝子が自由に粉砕される種を生じさせるなど、種々のトリックを身に付けている。
<関連情報>
- https://source.wustl.edu/2024/02/weedy-rice-gets-competitive-boost-from-its-wild-neighbors/
- https://www.nature.com/articles/s41467-024-45447-0
東南アジアで雑草の適応を促進する野生作物との境界線の多孔性 Porous borders at the wild-crop interface promote weed adaptation in Southeast Asia
Lin-Feng Li,Tonapha Pusadee,Marshall J. Wedger,Ya-Ling Li,Ming-Rui Li,Yee-Ling Lau,Soo-Joo Yap,Sansanee Jamjod,Benjavan Rerkasem,Yan Hao,Beng-Kah Song & Kenneth M. Olsen
Nature Communications Published:21 February 2024
DOI:https://doi.org/10.1038/s41467-024-45447-0
Abstract
High reproductive compatibility between crops and their wild relatives can provide benefits for crop breeding but also poses risks for agricultural weed evolution. Weedy rice is a feral relative of rice that infests paddies and causes severe crop losses worldwide. In regions of tropical Asia where the wild progenitor of rice occurs, weedy rice could be influenced by hybridization with the wild species. Genomic analysis of this phenomenon has been very limited. Here we use whole genome sequence analyses of 217 wild, weedy and cultivated rice samples to show that wild rice hybridization has contributed substantially to the evolution of Southeast Asian weedy rice, with some strains acquiring weed-adaptive traits through introgression from the wild progenitor. Our study highlights how adaptive introgression from wild species can contribute to agricultural weed evolution, and it provides a case study of parallel evolution of weediness in independently-evolved strains of a weedy crop relative.
