Journal Article

Genetic Control of Petiole Length in <i>Arabidopsis thaliana</i>

Hirokazu Tsukaya, Toshiaki Kozuka and Gyung-Tae Kim

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 10, pages 1221-1228
Published in print October 2002 | ISSN: 0032-0781
Published online October 2002 | e-ISSN: 1471-9053 | DOI:
Genetic Control of Petiole Length in Arabidopsis thaliana

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry


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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.

Keywords: Keywords: Arabidopsis thaliana — Gibberellic acid — Leaf morphogenesis — Mutants — Petiole — Phytochrome — Photomorphogenesis — Shade avoidance.; Abbreviations: GA, gibberellic acids; GA3, gibberellin 3.

Journal Article.  5982 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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