Qian Lan-Hua, Wang Yue, Chen Min, Liu Jia, Lu Rui-Sen, Zou Xin, Sun Xiao-Qin, Zhang Yan-Mei
Suzhou Polytechnic Institute of Agriculture, Suzhou, China.
Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing, China.
Front Genet. 2021 Nov 9;12:771814. doi: 10.3389/fgene.2021.771814. eCollection 2021.
is an important crop in the Triticeae tribe of the Poaceae family, and it has unique agronomic characteristics and genome properties. It possesses resistance to many diseases and serves as an important resource for the breeding of other Triticeae crops. We performed a genome-wide study on to identify the largest group of plant disease resistance genes ( genes), the nucleotide-binding site-leucine-rich repeat receptor (NBS-LRR) genes. In its genome, 582 NBS-LRR genes were identified, including one from the RNL subclass and 581 from the CNL subclass. The NBS-LRR gene number in the genome is greater than that in barley and the diploid wheat genomes. chromosome 4 contains the largest number of NBS-LRR genes among the seven chromosomes, which is different from the pattern in barley and the genomes B and D of wheat but similar to that in the genome A of wheat. Further synteny analysis suggests that more NBS-LRR genes on chromosome 4 have been inherited from a common ancestor by and the wheat genome A than the wheat genomes B and D. Phylogenetic analysis revealed that at least 740 NBS-LRR lineages are present in the common ancestor of , and . However, most of them have only been inherited by one or two species, with only 65 of them preserved in all three species. The genome inherited 382 of these ancestral NBS-LRR lineages, but 120 of them have been lost in both and . This study provides the full NBS-LRR profile of the genome, which is a resource for breeding and indicates that can be an important material for the molecular breeding of other Triticeae crops.
是禾本科小麦族中的一种重要作物，具有独特的农艺性状和基因组特性。它对多种病害具有抗性，是其他小麦族作物育种的重要资源。我们对进行了全基因组研究，以鉴定最大的植物抗病基因群体（基因），即核苷酸结合位点富含亮氨酸重复序列受体（NBS-LRR）基因。在其基因组中，鉴定出582个NBS-LRR基因，包括1个来自RNL亚类和581个来自CNL亚类。基因组中的NBS-LRR基因数量多于大麦和二倍体小麦基因组。4号染色体在七条染色体中包含的NBS-LRR基因数量最多，这与大麦以及小麦的B和D基因组中的模式不同，但与小麦的A基因组中的模式相似。进一步的共线性分析表明，4号染色体上更多的NBS-LRR基因是由和小麦A基因组从共同祖先遗传而来的，而非小麦B和D基因组。系统发育分析表明，、和的共同祖先中至少存在740个NBS-LRR谱系。然而，其中大多数仅被一两个物种继承，只有65个在所有三个物种中都得以保留。基因组继承了这些祖先NBS-LRR谱系中的382个，但其中120个在和中都已丢失。本研究提供了基因组的完整NBS-LRR图谱，这是育种的资源，并表明可成为其他小麦族作物分子育种的重要材料。
