生物
光敏色素
光周期性
抑制因子
早晨
遗传学
生物钟
基因
航向(导航)
昼夜节律
基因表达
拟南芥
细胞生物学
植物
突变体
内分泌学
红灯
大地测量学
地理
作者
Hironori Itoh,Yasunori Nonoue,Masahiro Yano,Takeshi Izawa
出处
期刊:Nature Genetics
[Springer Nature]
日期:2010-06-13
卷期号:42 (7): 635-638
被引量:246
摘要
The critical day length triggering photoperiodic flowering is set as an acute, accurate threshold in many short-day plants, including rice. Here, we show that, unlike the Arabidopsis florigen gene FT, 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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