Journal
SCIENCE
Volume 349, Issue 6247, Pages 540-543Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab1140
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Funding
- University of Georgia (UGA) Research Foundation
- NSF [IOS-1350561, DEB-1149350, DBI-0701748, IOS-1238057]
- NSF Graduate Research Fellowship
- National Institute of Food and Agriculture grant [135997]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) KAKENHI [221S0002, 25711019, 25128716, 24228008]
- Alberta Ministry of Innovation and Advanced Education
- Alberta Innovates Technology Futures Innovates Centres of Research Excellence
- Musea Ventures
- BGI-Shenzhen
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1350561] Funding Source: National Science Foundation
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [1238057] Funding Source: National Science Foundation
- Grants-in-Aid for Scientific Research [25711019, 15K21750, 15H05959, 15H05955] Funding Source: KAKEN
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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.
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