Geographical variation of the genes controlling hybrid breakdown and genetic differentiation of the chromosomal regions harboring these genes in Asian cultivated rice, Oryza sativa L.

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The geographical variation of two genes, <i>hwd1</i> and <i>hwd2</i>, controlling hybrid breakdown (F<sub>2</sub> weakness) was surveyed in 239 Asian rice cultivars. The cultivars with the genotype <i>Hwd1/Hwd1</i> <i>Hwd2/Hwd2</i> were predominant in South Asia and Southeast Asia, while those with the genotype <i>Hwd1/Hwd1</i> <i>hwd2/hwd2</i> were predominant in Japan, the Philippines, and Yunnan province, China. Only one cultivar from Laos had the genotype <i>hwd1/hwd1</i> <i>Hwd2/Hwd2</i>. Preferential association was found between the presence or absence of <i>hwd2</i> and the two major cultivar groups (indica and japonica) based on diagnostic RFLP markers. Dominant homozygotes were frequent in indica rice cultivars, while recessive homozygotes were frequent in japonica rice cultivars. This association was not clear for cultivars from the center of genetic diversity of rice, ranging from Vietnam to Bangladesh. Polymorphisms were surveyed for RFLP markers on chromosomes 10 and 7, harboring <i>hwd1</i> and <i>hwd2</i> loci, respectively. The region around <i>hwd2</i> tended to be differentiated in allelic combination among cultivars into the indica and japonica rice groups. No such trend was found around the <i>hwd1</i> region. These facts suggest the hybrid breakdown controlled by this genic system is a rare phenomenon and consequently did not contribute to cultivar differentiation of rice.<br>

収録刊行物

  • Genes & genetic systems

    Genes & genetic systems 73(4), 211-217, 1998-08

    The Genetics Society of Japan

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各種コード

  • NII論文ID(NAID)
    10003762784
  • NII書誌ID(NCID)
    AA11077421
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13417568
  • NDL 記事登録ID
    4598855
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z53-W539
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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