Journal
NATURE GENETICS
Volume 42, Issue 7, Pages 635-U115Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ng.606
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Funding
- Ministry of Agriculture, Forestry and Fisheries of Japan [GPN0001]
- Ministry of Education, Culture, Sports, Science and Technology [20770040]
- Grants-in-Aid for Scientific Research [20770040] Funding Source: KAKEN
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The critical day length triggering photoperiodic flowering is set as an acute, accurate threshold in many short-day plants, including rice(1,2). Here, we show that, unlike the Arabidopsis florigen gene FT3, the rice florigen gene Hd3a (Heading date 3a) is toggled by only a 30-min day-length reduction. Hd3a expression is induced by Ehd1 (Early heading date 1) expression when blue light coincides with the morning phase set by OsGIGANTEA(OsGI)-dependent circadian clocks. Ehd1 expression is repressed by both night breaks under short-day conditions and morning light signals under long-day conditions. Ghd7 (Grain number, plant height and heading date 7) was acutely induced when phytochrome signals coincided with a photosensitive phase set differently by distinct photoperiods and this induction repressed Ehd1 the next morning. Thus, two distinct gating mechanisms-of the floral promoter Ehd1 and the floral repressor Ghd7-could enable manipulation of slight differences in day length to control Hd3a transcription with a critical day-length threshold.
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