Genome sequencing and analysis of the peanut b-genome progenitor (Arachis ipaensis)

Peanut (Arachis hypogaea L.), an important leguminous crop, is widely cultivated in tropical and subtropical regions. Peanut is an allotetraploid, having A and B subgenomes that maybe have originated in its diploid progenitors Arachis duranensis (A-genome) and Arachis ipaensis (B-genome), respectively. We previously sequenced the former and here present the draft genome of the latter, expanding our knowledge of the unique biology of Arachis. The assembled genome of A. ipaensis is ~1.39 Gb with 39,704 predicted protein-encoding genes. A gene family analysis revealed that the FAR1 family may be involved in regulating peanut special fruit development. Genomic evolutionary analyses estimated that the two progenitors diverged ~3.3 million years ago and suggested that A. ipaensis experienced a whole-genome duplication event after the divergence of Glycine max. We identified a set of disease resistance-related genes and candidate genes for biological nitrogen fixation. In particular, two and ...

花生（Arachis hypogaea L.）作为重要的豆科作物，广泛种植于热带及亚热带地区。花生为异源四倍体（allotetraploid），拥有A和B两个亚基因组（subgenomes），其起源可能分别来自二倍体祖先（diploid progenitors）——花生属杜兰尼ensis（Arachis duranensis，A基因组）与花生属ipaensis（Arachis ipaensis，B基因组）。我们此前已完成前者的测序，本文则呈现后者的基因组草图（draft genome），此举拓展了我们对花生属独特生物学特性的认知。组装得到的A. ipaensis基因组大小约为1.39 Gb，预测含39704个蛋白质编码基因（protein-encoding genes）。基因家族分析（gene family analysis）显示，FAR1家族可能参与调控花生特有的果实发育过程。基因组进化分析（genomic evolutionary analyses）估算，两个祖先物种约在330万年前分化，并表明A. ipaensis在大豆（Glycine max）分化后经历过一次全基因组复制事件（whole-genome duplication event）。我们鉴定出一组抗病相关基因（disease resistance-related genes）及生物固氮（biological nitrogen fixation）候选基因。特别地，两个及……