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Distribution of the genes causing F2 chlorosis in rice cultivars of the Indica and Japonica types

Chlorotic plants were segregated in F₂ populations in varietal crosses of common rice. The genetic basis and distribution of the genes causing F₂ chlorosis in native cultivars were studied to examine the role of the F₂ chlorosis in varietal differentiation of rice. It was proven that this F₂ chlorosis was controlled by a set of duplicate genes, hca-1 and hca-2. The hca-2 gene was widely distributed in native cultivars of the Japonica type, while many Indica types carried its dominant allele hca-2 ⁺. Japanese cultivar J-147 carried hca-2. The hca-1 gene was frequently distributed in cultivars containing the Hwc-2 gene for F₁ weakness. We concluded that F₂ chlorosis does not cause or promote varietal differentiation in rice.

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1. National Institute of Genetics, 411, Mishima, Japan

   Y. I. Sato & H. Morishima

1. Y. I. Sato
2. H. Morishima

Communicated by G.S. Khush

Sato, Y.I., Morishima, H. Distribution of the genes causing F₂ chlorosis in rice cultivars of the Indica and Japonica types. Theoret. Appl. Genetics 75, 723–727 (1988). https://doi.org/10.1007/BF00265594

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• Received: 15 February 1987

• Accepted: 03 November 1987

• Issue Date: May 1988

• DOI: https://doi.org/10.1007/BF00265594

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