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PLANT PHYSIOLOGY , Vol 115, Issue 2 419-426, Copyright © 1997 by American Society of Plant Biologists

DEVELOPMENT AND GROWTH REGULATION

The massugu1 Mutation of Arabidopsis Identified with Failure of Auxin-Induced Growth Curvature of Hypocotyl Confers Auxin Insensitivity to Hypocotyl and Leaf

M. K. Watahiki and K. T. Yamamoto
Division of Biological Science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, 060 Japan

Unilateral application of indole-3-acetic acid (IAA) in a lanolin base to hypocotyls of partially etiolated seedlings of wild-type Arabidopsis thaliana induced growth curvature in a dose-dependent manner. The effects of IAA in concentrations from 1 to 1000 [mu]M were studied, with maximum IAA-induced curvature at 100 [mu]M. Three IAA-insensitive mutants were isolated and are all in the same locus, massugu1 (msg1). They did not undergo hypocotyl growth curvature at any of the IAA concentrations tested. msg1 is recessive and is located on chromosome 5. msg1 hypocotyl growth is resistant to 2,4-dichlorophenoxyacetic acid (2,4-D), but the roots are as sensitive to 2,4-D as the wild type. Growth of the hypocotyl was inhibited to essentially the same extent as the wild type by 6-benzylaminopurine, abscisic acid, and l-aminocyclopropane-1-carboxylate, an ethylene precursor. The msg1 leaves were also resistant to 2,4-D-induced chlorosis. The gravitropic response of the msg1 hypocotyl takes much more time to initiate and achieve the wild-type degree of curvature, whereas the msg1 roots responded normally to gravity. The mature plants and the etiolated seedlings of msg1 were generally wild type in appearance, except that their rosette leaves were either epinastic or hyponastic. msg1 is the first auxin-insensitive mutant in which its effects are mostly restricted to the hypocotyl and leaf, and msg1 also appears to be auxin specific.


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