Comparative genomics of orobanchaceous species with different parasitic lifestyles reveals the origin and stepwise evolution of plant parasitism  

作　　者：Yuxing Xu Jingxiong Zhang Canrong Ma Yunting Lei Guojing Shen Jianjun Jin Deren A.R.Eaton' Jianqiang Wu 

机构地区：[1]Department of Economic Plants and Biotechnology,Yunnan Key Laboratory for Wild Plant Resources,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China [2]CAS Center for Excellence in Biotic Interactions,University of Chinese Academy of Sciences,Beijing 100049,China [3]Department of Ecology,Evolution and Environmental Biology,Columbia University,New York,NY 10027,USA

出　　处：《Molecular Plant》2022年第8期1384-1399,共16页分子植物（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China(32000179 Y.X.);the Strategic Priority Research Program of Chinese Academy of Sciences(XDPB16 J.W.);the CAS"Light of West China"Program(G.S.);the Special Research Assistant of Chinese Academy of Sciences(Y.X.and J.Z.);the Postdoctoral Directional Training Foundation of Yunnan Province(Y.X.).

摘　　要：Orobanchaceae is the largest family of parasiticplants,containing autotrophic and parasiticplants with all degrees of parasitism.This makes it byfar the best family for studying the origin and evolution of plant parasitism.Here we provide three high-quality genomes of orobanchaceous plants,the autotrophic Lindenbergia luchunensis and the holoparasitic plants Phelipanche aegyptiaca and Orobanche cumana.Phylogenomic analysis of these three genomes together with those previously published and the transcriptomes of other orobanchaceous species createda robust phylogeneticframework forOrobanchaceae.We found that an ancient whole-genome duplication(WGD;about 73.48million years ago),which occurred earlierthan theoriginof Orobanchaceae,mighthave contributed totheemergence of parasitism.However,no WGD events occurred in any lineage of orobanchaceous parasites except for Striga after divergence from their autotrophic common ancestor,suggesting that,in contrast with previous speculations,WGD is not associated with the emergence of holoparasitism.We detected evident convergent gene loss in all parasites within Orobanchaceae and between Orobanchaceae and dodder Cuscuta australis.The gene families in the orobanchaceous parasites showed a clear pattern of recent gains and expansions.The expanded gene families are enriched in functions related to the development of the haustorium,suggesting that recent gene family expansions may have facilitated the adaptation of orobanchaceous parasites to different hosts.This study illustrates a stepwise pattern in the evolution of parasitism in the orobanchaceous parasites and will facilitate future studieson parasitism and the control of parasitic plants in agriculture.

关 键 词：GENOMICS OROBANCHACEAE PARASITISM whole-genome duplication gene loss gene family expansion 

分 类 号：Q94[生物学—植物学]