Genes & Genetic Systems
Online ISSN : 1880-5779
Print ISSN : 1341-7568
ISSN-L : 1341-7568
Short communications
Phytochrome dependent quantitative control of Hd3a transcription is the basis of the night break effect in rice flowering
Ryo IshikawaTomoko ShinomuraMakoto TakanoKo Shimamoto
Author information
JOURNALS FREE ACCESS FULL-TEXT HTML

2009 Volume 84 Issue 2 Pages 179-184

Details
Abstract

A short exposure to light during relative night (night break; NB) delays flowering in the short day plant rice. NB acts by downregulating Heading date 3a (Hd3a) expression. Because phytochrome B mutants do not respond to NB and their flowering time is not affected even under NB conditions, phyB is required for the suppression of Hd3a expression. The effect of NB is quantitatively controlled by light quality and by either light intensity or duration. However, the molecular mechanisms that regulate these interactions are poorly understood. Here, we examine the roles of phytochromes in the regulation of Hd3a transcription under NB conditions using monochromatic red, far-red and blue light. Red and blue light downregulated Hd3a expression, but far-red light NB did not. The effect of red light NB on Hd3a is dependent on photon fluence and is restored by subsequent far-red light irradiation. Our results suggest that quantitative effect of light on flowering in rice NB is mediated by the regulation of Hd3a transcription by phyB.

Information related to the author
© 2009 by The Genetics Society of Japan
Previous article Next article
feedback
Top