Plant and Cell Physiology Advance Access originally published online on January 19, 2005
Plant and Cell Physiology 2005 46(1):213-223; doi:10.1093/pcp/pci016
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© 2005 Oxford University Press
The Different Growth Responses of the Arabidopsis thaliana Leaf Blade and the Petiole during Shade Avoidance are Regulated by Photoreceptors and Sugar
1 Department of Biosystems Science, School of Advanced Science, The Graduate University for Advanced Studies, Hayama, Kanagawa, 240-0193 Japan
2 National Institute for Basic Biology, Center for Integrated Bioscience, Okazaki, Aichi, 444-8585 Japan
3 Faculty of Natural Resources and Life Sciences, Dong-A University, 840 Hadan-2-dong, Saha-gu, Pusan, 604-714 Korea
4 Laboratory for Genetic Regulatory Systems, Genomic Function Research Group, RIKEN Plant Science Center, 1-7-22 Suehiro-cho, Tsurumi, Yokohama, Kanagawa, 230-0045 Japan
During the shade-avoidance response, leaf blade expansion is inhibited and petiole elongation is enhanced. In this study, we examined the roles of photoreceptors and sugar on the differential growth of the leaf blade and petiole in shade conditions. Under the conditions examined, cell expansion, not cell division, played a major role in the differential leaf growth. The enhanced cell expansion in the leaf blade is associated with an increase in the ploidy level, whereas cell elongation was stimulated in the petiole in dark conditions without an increase in the ploidy level. Analysis of phytochrome, cryptochrome and phototropin mutants revealed that phytochromes and cryptochromes specifically regulate the contrasting growth patterns of the leaf blade and petiole in shade. Examination of the effects of photo-assimilated sucrose on the growth of the leaf blade and petiole revealed growth-promotional effects of sucrose that are highly dependent on the light conditions. The leaf blades of abscisic acid-deficient and sugar-insensitive mutants did not expand in blue light, but expanded normally in red light. These results suggest that both the regulation of light signals and the modulation of responses to sugar are important in the control of the differential photomorphogenesis of the leaf blade and petiole.
5 Present address: RIKEN, Center for Developmental Biology, 2-2-3 Minatojima-minamimachi, chuo-ku, Kobe 650-0047, Japan.
6 Corresponding author: E-mail, tsukaya{at}nibb.ac.jp; Fax, +81-564-55-7512.
(Received October 4, 2004; Accepted November 5, 2004)
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