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Plant and Cell Physiology, 2002, Vol. 43, No. 10 1221-1228
© 2002 Oxford University Press

Genetic Control of Petiole Length in Arabidopsis thaliana

Hirokazu Tsukaya1,2,3, Toshiaki Kozuka2 and Gyung-Tae Kim4

National Institute for Basic Biology, 38 Nishigonaka, Myodaiji-cho, Okazaki, 444-8585 Japan

Shade-avoidance syndrome is characterized by the formation of elongated petioles and unexpanded leaf blades under low-intensity light, but the genetic basis for these responses is unknown. In this study, two-dimensional mutational analysis revealed that the gene for phytochrome B, PHYB, had opposing effects in the leaf petioles and leaf blades of Arabidopsis, while the ROT3, ACL2, and GAI genes influenced the length of leaf petioles more significantly than the length of leaf blades. Anatomical analysis revealed that the PHYB and ACL2 genes control the length of leaf petioles exclusively via control of the length of individual cells, while the GAI, GA1 and ROT3 genes appeared to control both the elongation and proliferation of petiole cells, in particular, under strong light. By contrast, both the size and the number of cells were affected by the mutations examined in leaf blades. The differential control of leaf petiole length and leaf blade expansion is discussed.

1 Corresponding author: E-mail, tsukaya@nibb.ac.jp; Fax, +81-564-55-7512.

2 School of Advanced Sciences, The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa, 240-0193 Japan.

3 Additional affiliation: Form and Function, PRESTO, Japan Science and Technology Corporation, 4-1-8 Honcho, Kawaguchi, 332-0012 Japan.

4 Present address: Faculty of Natural Resources and Life Sciences, Dong-A University, 840 Hadan-2-dong, Saha-gu, Pusan, 604-714 Korea.


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