Spontaneous Brassinolide-insensitive Barley Mutants 'uzu' Adapted to East Asia

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概要

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• The uzu gene shows typical semi-dwarf plant type and has resulted in lodging resistance and improved canopy structure in barley (Hordeum vulgare L.). The geographic distribution of 'uzu' lines is limited in East Asia including Japan, Korean peninsula and China. For many years, majority of cultivated six-rowed barley varieties in southern Japan were 'uzu' type. Inheritance of the uzu gene, located on chromosome 3H, is monogenic recessive and the expression is pleiotropic during developmental process. In cereal crop plants, several semidwarf genes have been widely used in breeding programs to increase productivity and it is known that several of these semi-dwarf genes were derived from gibberellin (GA)-related mutations. The barley dwarfing gene uzu is independent to GA. This characteristics are known earlier. In this study, we characterized uzu gene in molecular aspects. As the result of comprehensive study using several pairs of isogenic lines, we found the morphological and physiological similarities of barley uzu gene to rice dwarf mutant, d61. D61 encodes OsBRI1, which is homologous gene for Brassinosteroid insensitive 1 in Arabidopsis. We also found that 'uzu' lines specific single nucleotide polymorphism (SNP) contributed for amino acid substitution in barley homologous sequence of OsBRI1, HvBRI1. Linkage analysis using a segregating population for uzu showed the co-segregation between uzu and HvBRI1. Furthermore, as the results of derived cleaved amplified polymorphic sequences (dCAPS) marker analysis using more than 260 'uzu' landraces and the genomic sequencing analysis of HvBRI1 gene derived from 19 barley accessions, all the 'uzu' lines investigated in this study had the same SNP in putative kinase domain of HvBRI1. On the basis of these findings, we discussed the phylogeny of 'uzu' landraces in East Asia.

著者

• KITANO Hidemi

  Bioscience and Biotechnology Center, Nagoya University

• Chono Makiko

  Department Of Wheat And Barley Research National Institute Of Crop Science

• Chono Makiko

  National Institute Of Crop Science (nics)

• Honda Ichiro

  Department Of Gastroenterological Surgery Chiba Cancer Center

• Kitano Hidemi

  Bioscience And Biotechnology Center Nagoya University

• Kitano H

  Nagoya Univ. Nagoya Jpn

• Kitano Hidemi

  Grad. Sch. Bioagr. Sci. Nagoya Univ.

• Honda Ichiro

  National Institute of Vegetable and Tea Science, National Agriculture and Food Research Organization

• TAKEDA Kazuyoshi

  Research Institute for Bioresources, Okayama University

• Kezuka Takeshi

  Department Of Ophthalmology Tokyo Medical University

• Takeda K

  Department Of Immunology Juntendo University School Of Medicine

• Kato Hisaharu

  Department Of Bioscience Fukui Prefectural University

• Kitano Hidemi

  Bioscience And Biotechnology Center Nagoya Univ.

• SAISHO Daisuke

  Research Institute for Bioresources (RIB), Okayama University

• Saisho Daisuke

  Research Institute For Bioresources Okayama University

• Saisho Daisuke

  Research Institute For Bioresources (rib) Okayama University

• Tanno Ken-ichi

  Research Institute for Bioresources, Okayama University

• Tanno Ken-ichi

  Research Institute For Bioresources Okayama University

• Kitano Hidemi

  Nagoya University School Of Agricultural Science

• Honda Ichiro

  National Institute Of Crop Science (nics)

• Takeda Kazuyoshi

  Research Institute For Bioresources Okayama University

• Chono Makiko

  Naro Institute Of Crop Science

• Takeda Kazuyoshi

  Research Institute Bioresource Okayama University

• Honda Ichiro

  National Agriculture Research Center

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