Journal
SCIENCE
Volume 350, Issue 6257, Pages 203-207Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aac9476
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Funding
- National Science and Engineering Research Council of Canada
- Grants-in-Aid for Scientific Research [15KT0031, 15K07102] Funding Source: KAKEN
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Strigolactones are naturally occurring signaling molecules that affect plant development, fungi-plant interactions, and parasitic plant infestations. We characterized the function of 11 strigolactone receptors from the parasitic plant Striga hermonthica using chemical and structural biology. We found a clade of polyspecific receptors, including one that is sensitive to picomolar concentrations of strigolactone. A crystal structure of a highly sensitive strigolactone receptor from Striga revealed a larger binding pocket than that of the Arabidopsis receptor, which could explain the increased range of strigolactone sensitivity. Thus, the sensitivity of Striga to strigolactones from host plants is driven by receptor sensitivity. By expressing strigolactone receptors in Arabidopsis, we developed a bioassay that can be used to identify chemicals and crops with altered strigolactone levels.
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