A Few Selected Approaches to Increase Genetic Diversity in Rice Breeding

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  • Yamamoto Toshio
    Institute of Plant Science and Resources, Okayama University
  • Furuta Tomoyuki
    Institute of Plant Science and Resources, Okayama University
  • Ogawa Daisuke
    Institute of Crop Science, National Agriculture and Food Research Organization
  • Yonemaru Jun-ichi
    Institute of Crop Science, National Agriculture and Food Research Organization
  • Kuniyoshi Daichi
    Laboratory of Plant Breeding, Research Faculty of Agriculture, Hokkaido University
  • Kishima Yuji
    Laboratory of Plant Breeding, Research Faculty of Agriculture, Hokkaido University

Bibliographic Information

Other Title
  • イネ育種における遺伝的多様性を拡大するための2,3のアプローチ
  • イネイクシュ ニ オケル イデンテキ タヨウセイ オ カクダイ スル タメ ノ 2,3 ノ アプローチ

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Abstract

We surveyed historical changes of genetic backgrounds of Japanese rice cultivars, and revealed that the genetic diversity has been gradually decreasing, which is caused by consecutive inbreeding within the recent cultivars. To address expanding demands for new rice varieties in the near future, and to improve effciency of breeding selection in quantitative traits, sufficient genetic variation should be included in the breeding populations. As a trial of maximizing potential genetic variation in a crossed population, we develped a multiparental population derived from 8-way crosses. The population covered wide range of phenotypic diversity, and suggested a possibility of breaking the corelations between grain length and width. Additionaly, we are developing genome shuffling population which is expected to break the tight linkage drag, and evaluating tetraploid lines which might be used for introduction of useful genes from wide relatives or adjusting phenotypic values by regulation of dosage effect.

Journal

  • Journal of Crop Research

    Journal of Crop Research 65 (0), 83-87, 2020

    The Society of Crop Science and Breeding in Kinki, Japan

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