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Regulation of Photoperiodic Flowering by Arabidopsis Photoreceptors
Todd Mockler, Hongyun Yang, XuHong Yu, Dhavan Parikh, Ying-chia Cheng, Sarah Dolan and Chentao Lin
Proceedings of the National Academy of Sciences of the United States of America
Vol. 100, No. 4 (Feb. 18, 2003), pp. 2140-2145
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/3138498
Page Count: 6
You can always find the topics here!Topics: Plants, Photoperiod, Photoreceptors, Flowering, Circadian rhythm, Physiological regulation, Visible spectrum, Flowers, Wavelengths, Plant cells
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Photoperiodism is a day-length-dependent seasonal change of physiological or developmental activities that is widely found in plants and animals. Photoperiodic flowering in plants is regulated by photosensory receptors including the red/far-red light-receptor phytochromes and the blue/UV-A light-receptor cryptochromes. However, the molecular mechanisms underlying the specific roles of individual photoreceptors have remained poorly understood. Here, we report a study of the day-length-dependent response of cryptochrome 2 (cry2) and phytochrome A (phyA) and their role as day-length sensors in Arabidopsis. The protein abundance of cry2 and phyA showed a diurnal rhythm in plants grown in short-day but not in plants grown in long-day. The short-day-specific diurnal rhythm of cry2 is determined primarily by blue light-dependent cry2 turnover. Consistent with a proposition that cry2 and phyA are the major day-length sensors in Arabidopsis, we show that phyA mediates far-red light promotion of flowering with modes of action similar to that of cry2. Based on these results and a finding that the photoperiodic responsiveness of plants depends on light quality, a model is proposed to explain how individual phytochromes and cryptochromes work together to confer photoperiodic responsiveness in Arabidopsis.
Proceedings of the National Academy of Sciences of the United States of America © 2003 National Academy of Sciences