A rice mutant with enhanced amylose content in endosperm without affecting amylopectin structure
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概要
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The <Wx>^b gene, one of the alleles at the rice waxy locus, responds to environmental temperatures during seed development and, as a result, the amylose content fluctuates and affects rice quality. Seeds of a low-amylose variety 'Snow Pearl' could be visibly distinguished depending on whether they matured in warm or cool temperatures; based on this, we isolated a mutant candidate, namely, the enhanced amylose content (ENA) mutant, which showed enhanced amylose content in the endosperm. The amylose contents of ENA mutants that matured at 20℃ and 26℃ were 6-7% higher than those of Snow Pearl. As the chain length distributions of amylopectin were almost identical between ENA and Snow Pearl, the mutation was not the amylose-extender mutation, but a new mutation that enhanced amylose content in the rice endosperm. Furthermore, ENA and Snow Pearl had a single nucleotide polymorphism on the third exon of the Wx gene and a single base change at the 5' splice junction of the first intron specific to the <Wx>^b gene. Genetic analysis revealed that enhanced amylose content is controlled by 2 recessive genes. Thus, we isolated a rice mutant with enhanced amylose content in the endosperm without affecting the amylopectin structure. As global warming or higher maturation temperatures decrease the amylose content in rice endosperms, the mutant obtained in this study would be useful in breeding programs to diversify grain quality and to understand the genetic and molecular mechanisms of amylose synthesis.
- 日本育種学会の論文
著者
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Ise Kazuo
Japan International Research Center for Agricultural Sciences
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Ise Kazuo
Japan International Res. Center For Agricultural Sciences
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SUZUKI Yasuhiro
National Institute for Fusion Science, Toki 509-5292, Japan
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Suzuki Yasuhiro
National Agriculture And Food Res. Organization (naro) National Inst. Of Crop Sci.
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Suzuki Yasuhiro
National Agriculture And Food Research Organization (naro) National Institute Of Crop Science
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Sano Yoshio
Graduate School of Agriculture, Hokkaido University
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Matsukura Ushio
National Agriculture and Food Research Organization (NARO), National Institute of Crop Science
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Aoki Noriaki
National Agriculture and Food Research Organization (NARO), National Institute of Crop Science
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Sato Hiroyuki
National Agriculture and Food Research Organization (NARO), National Institute of Crop Science
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Sano Yoshio
Graduate School Of Agriculture Hokkaido Univ.
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Sano Yoshio
Graduate School Of Agriculture Hokkaido University
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Matsukura Ushio
National Agriculture And Food Research Organization (naro) National Institute Of Crop Science:nation
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Aoki Noriaki
National Agriculture And Food Research Organization (naro) National Institute Of Crop Science
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佐藤 宏之
National Institute Of Crop Science
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Shimizu H
National Agricultural Research Center For Hokkaido Region
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Sato Hiroyuki
National Agriculture And Food Research Organization (naro) National Institute Of Crop Science:agricu
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Aoki Noriaki
National Institute Of Crop Science National Agriculture And Food Research Organization (naro)
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