Convergent evolution of strigolactone perception enabled host detection in parasitic plants

被引：232

作者：

Conn, Caitlin E. ^{[1
]}

Bythell-Douglas, Rohan ^{[2
]}

Neumann, Drexel ^{[1
]}

Yoshida, Satoko ^{[3
]}

Whittington, Bryan ^{[4
]}

Westwood, James H. ^{[4
]}

Shirasu, Ken ^{[3
]}

Bond, Charles S. ^{[2
]}

Dyer, Kelly A. ^{[1
]}

Nelson, David C. ^{[1
]}

机构：

[1] Univ Georgia, Dept Genet, Athens, GA 30602 USA

[2] Univ Western Australia, Sch Chem & Biochem, Crawley, WA 6009, Australia

[3] RIKEN, Ctr Sustainable Resource Sci, Tsurumi Ku, Yokohama, Kanagawa 2300045, Japan

[4] Virginia Tech, Dept Plant Pathol Physiol & Weed Sci, Blacksburg, VA 24061 USA

来源：

SCIENCE | 2015年 / 349卷 / 6247期

基金：

美国国家科学基金会; 美国食品与农业研究所;

关键词：

SEED-GERMINATION; ARABIDOPSIS; KARRIKIN; OROBANCHE; HORMONES; DWARF14; STRIGA; INHIBITION; RESPONSES; SIGNAL;

D O I：

10.1126/science.aab1140

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Obligate parasitic plants in the Orobanchaceae germinate after sensing plant hormones, strigolactones, exuded from host roots. In Arabidopsis thaliana, the alpha/beta-hydrolase D14 acts as a strigolactone receptor that controls shoot branching, whereas its ancestral paralog, KAI2, mediates karrikin-specific germination responses. We observed that KAI2, but not D14, is present at higher copy numbers in parasitic species than in nonparasitic relatives. KAI2 paralogs in parasites are distributed into three phylogenetic clades. The fastest-evolving clade, KAI2d, contains the majority of KAI2 paralogs. Homology models predict that the ligand-binding pockets of KAI2d resemble D14. KAI2d transgenes confer strigolactone-specific germination responses to Arabidopsis thaliana. Thus, the KAI2 paralogs D14 and KAI2d underwent convergent evolution of strigolactone recognition, respectively enabling developmental responses to strigolactones in angiosperms and host detection in parasites.

引用

页码：540 / 543

页数：4

共 24 条

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