Summary
Distribution of two complementary genes Hwc-1 and Hwc-2 causing F1 weakness was examined using 159 native rice cultivars and 30 strains of wild relatives collected from various sites of tropical Asia including the Himalayan foothills. Hwc-1 is carried by a Peruvian cultivar, Jamaica, a tester cultivar of this experiment. It was not found in the tested cultivars and strains. Hwc-2 was widely distributed in the Japonica types tested. No wild strains had either Hwc-1 or Hwc-2. Hwc-2 was infrequent in the Japonica types collected from Southern Asian countries. Hwc-2 was estimated to be indigenous to the Japonica types, may be linked with certain gene(s) related to adaptation.
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Sato, Y.I., Morishima, H. Studies on the distribution of complementary genes causing F1 weakness in common rice and its wild relatives. 2. Distribution of two complementary genes, Hwc-1 and Hwc-2 gene in native cultivars and its wild relatives of tropical Asia. Euphytica 36, 425–431 (1987). https://doi.org/10.1007/BF00041485
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DOI: https://doi.org/10.1007/BF00041485