聚寶殿角子機娛樂場-解放軍報
Molecular Plant:薏米基因組The Coix genome provides insights into Panicoideae evolution and papery hull domesticationFirst author: Chao Guo; Affiliations: Sichuan Agricultural University (四川農業大學): Chengdu錛 ChinaCorresponding author: Shufeng ZhouCoix is a grass crop domesticated as early as Neolithic era. It is still widely cultivated for both highly nutritional food and medicinal use. However錛 the genetic study and breeding of this crop are hindered by lack of a sequenced genome. Here we report de novo sequencing and assembly of the 1錛619 Mb genome of Coix錛 and annotation of 75.39% repeats and 39錛629 protein-coding genes. Comparative genomics analysis showed that Coix is more closely related to sorghum rather than maize錛 but intriguingly only Coix and maize had a recent whole genome duplication event which was not detected in sorghum. We further constructed a genetic map and mapped several important traits especially the strength of hull. Selection of papery hull (thin錛 easy-dehulling) from the stony one (thick錛 hard-dehulling) in wild progenitors was a key step in Coix domestication. The papery hull makes seed easier to process and germinate. Anatomic and global transcriptome analysis revealed that the papery hull is resulted from inhibition of cell division and wall biogenesis. We also successfully demonstrated that seed hull pressure resistance is controlled by two major quantitative trait loci (QTLs)錛 which are associated with hull thickness and color錛 respectively. The two QTLs were further fine mapped within intervals of 250 Kb and 146 Kb錛 respectively. These resources provide a platform for evolutionary studies and will facilitate molecular breeding of this important crop.薏米是一個在新石器時代就已經被馴化的草類作物。現在,薏米仍作為營養食物和醫藥用途被廣泛種植。然而,由于缺乏全基因組序列,