Journal
JOURNAL OF EXPERIMENTAL BOTANY
Volume 69, Issue 9, Pages 2355-2365Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jxb/ery014
Keywords
Arabidopsis; DWARF14; phytohormone; receptor; rice; strigolactone
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Funding
- National Key R&D Program of China [2016YFA0500501]
- National Natural Science Foundation of China [31421001, 91635301]
- China Association for Science and Technology
- Postdoctoral Fellowship of Tsinghua-Peking Joint Center for Life Sciences
- China Postdoctoral Science Foundation
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Strigolactones (SLs) act as an important class of phytohormones to regulate plant shoot branching, and also serve as rhizosphere signals to mediate interactions of host plants with soil microbes and parasitic weeds. SL receptors in dicots, such as DWARF14 in Arabidopsis (AtD14), RMS3 in pea, and ShHTL7 in Striga, serve as unconventional receptors that hydrolyze SLs into a D-ring-derived intermediate CLIM and irreversibly bind CLIM to trigger SL signal transduction. Here, we show that D14 from the monocot rice can complement Arabidopsis d14 mutant and interact with the SL signaling components in Arabidopsis. Our results further reveal that rice D14, similar to SL receptors in dicots, also serves as an unconventional hormone receptor that generates and irreversibly binds the active form of SLs. These findings uncover the conserved functions of D14 proteins in monocots and dicots.
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