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Plant Cell, Vol. 13, 999-1010, May 2001, Copyright © 2001, American Society of Plant Physiologists

slender Rice, a Constitutive Gibberellin Response Mutant, Is Caused by a Null Mutation of the SLR1 Gene, an Ortholog of the Height-Regulating Gene GAI/RGA/RHT/D8

Akira Ikedaa,b, Miyako Ueguchi-Tanakaa, Yutaka Sonodaa, Hidemi Kitanoa, Masaji Koshiokac, Yuzo Futsuharab, Makoto Matsuokaa, and Junji Yamaguchia
a BioScience Center and Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
b Department of Agriculture, Meijo University, Tenpaku, Nagoya 468-8503, Japan
c National Research Institute of Vegetables, Ornamental Plants, and Tea, 60 Kusawa, Ano, Age, Mie 514-2328, Japan

Correspondence to: Junji Yamaguchi, jjyama{at}sci.hokudai.ac.jp (E-mail), 81-11-706-2737 (fax)

The rice slender mutant (slr1-1) is caused by a single recessive mutation and results in a constitutive gibberellin (GA) response phenotype. The mutant elongates as if saturated with GAs. In this mutant, (1) elongation was unaffected by an inhibitor of GA biosynthesis, (2) GA-inducible {alpha}-amylase was produced by the aleurone layers without gibberellic acid application, and (3) endogenous GA content was lower than in the wild-type plant. These results indicate that the product of the SLR1 gene is an intermediate of the GA signal transduction pathway. SLR1 maps to OsGAI in rice and has significant homology with height-regulating genes, such as RHT-1Da in wheat, D8 in maize, and GAI and RGA in Arabidopsis. The GAI gene family is likely to encode transcriptional factors belonging to the GRAS gene superfamily. DNA sequence analysis revealed that the slr1-1 mutation is a single basepair deletion of the nuclear localization signal domain, resulting in a frameshift mutation that abolishes protein production. Furthermore, introduction of a 6-kb genomic DNA fragment containing the wild-type SLR1 gene into the slr1-1 mutant restored GA sensitivity to normal. These results indicate that the slr1-1 mutant is caused by a loss-of-function mutation of the SLR1 gene, which is an ortholog of GAI, RGA, RHT, and D8. We also succeeded in producing GA-insensitive dwarf rice by transforming wild-type rice with a modified SLR1 gene construct that has a 17–amino acid deletion affecting the DELLA region. Thus, we demonstrate opposite GA response phenotypes depending on the type of mutations in SLR1.




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