Publication Date:
2015-08-01
Description:
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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Conn, Caitlin E -- Bythell-Douglas, Rohan -- Neumann, Drexel -- Yoshida, Satoko -- Whittington, Bryan -- Westwood, James H -- Shirasu, Ken -- Bond, Charles S -- Dyer, Kelly A -- Nelson, David C -- New York, N.Y. -- Science. 2015 Jul 31;349(6247):540-3. doi: 10.1126/science.aab1140.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Genetics, University of Georgia, Athens, GA 30602, USA. ; School of Chemistry and Biochemistry, The University of Western Australia, Crawley, Western Australia 6009, Australia. ; RIKEN Center for Sustainable Resource Science, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan. ; Department of Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA 24061, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26228149" target="_blank"〉PubMed〈/a〉
Keywords:
Arabidopsis/*metabolism/*parasitology
;
Arabidopsis Proteins/*classification/genetics/metabolism
;
*Biological Evolution
;
Gene Dosage
;
Germination
;
Heterocyclic Compounds, 1-Ring/*metabolism
;
Host-Parasite Interactions
;
Hydrolases/*classification/genetics/metabolism
;
Lactones/*metabolism
;
Orobanchaceae/*enzymology/genetics/growth & development
;
Phylogeny
;
Plant Growth Regulators/*metabolism
;
Plant Roots/metabolism/parasitology
;
Plants, Genetically Modified/genetics/metabolism
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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