NDLI: GA-sensitive dwarf1-1D (gsd1-1D) Defines a New Mutation that Controls Endogenous GA Levels in Arabidopsis

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GA-sensitive dwarf1-1D (gsd1-1D) Defines a New Mutation that Controls Endogenous GA Levels in Arabidopsis

Content Provider	Springer Nature Link
Author	Ayele, Belay T. Magome, Hiroshi Lee, Sumin Shin, Kihye Kamiya, Yuji Soh, Moon Soo Yamaguchi, Shinjiro
Copyright Year	2013
Abstract	Gibberellin (GA) regulates diverse plant growth and developmental processes. A number of GA inactivation mechanisms and the associated enzyme-encoding genes and transcriptional regulators have been identified in plants. Identification of a novel dominant GA-sensitive mutant of Arabidopsis, GA-sensitive dwarf1-1D (gsd1-1D), exhibiting phenotypes typical of GA-deficient mutants, including semidwarfism and smaller and dark green leaves, has been reported previously. Unlike the severe GA-deficient mutants such as ga1-3, gsd1-1D seeds displayed a normal GA-sensitive germination phenotype. To gain insights into how the gsd1-1D mutation affects GA metabolism, we performed dose-response studies with several GA biosynthetic intermediates. The results implied that the gsd1-1D mutation preferentially affects the activity of the non-13-hydroxylated bioactive GA, GA4. Our gene expression analysis indicated upregulation of GA2ox1 in the gsd1-1D mutant relative to that in the wild-type and GA-deficient ga3ox1/ga3ox2 mutant; however, this does not appear to be the major cause for the phenotype exhibited by gsd1-1D as the basal level of GA2ox1 expression is low. Measurement of endogenous levels of GAs showed a substantial decrease in the amounts of non-13-hydroxylated GA precursors and GA4 and their respective catabolites in gsd1-1D. Although to a lesser extent, the levels of some 13-hydroxylated GA precursors and bioactive GA1 were also reduced by the gsd1-1D mutation. Taken together, our results suggest that GSD1 is involved in the GA inactivation process and thereby regulates the levels of bioactive GAs in Arabidopsis.
Starting Page	340
Ending Page	354
Page Count	15
File Format	PDF
ISSN	07217595
Journal	Journal of Plant Growth Regulation
Volume Number	33
Issue Number	2
e-ISSN	14358107
Language	English
Publisher	Springer US
Publisher Date	2013-11-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Arabidopsis Gene expression Gibberellin gsd1-1D gsd1-2r Hormone treatment Mutation Plant Sciences Plant Anatomy/Development Plant Physiology Agriculture
Content Type	Text
Resource Type	Article
Subject	Plant Science Agronomy and Crop Science

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