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The discovery determination and utilization of the hubei china photosensitive genic male sterile rice oryza sativa ssp japonica



The discovery determination and utilization of the hubei china photosensitive genic male sterile rice oryza sativa ssp japonica



Acta Genetica Sinica 13(2): 107-112



In 1973, in the field of the single cropping late Geng-type rice (O. sativa subsp. japonica) cv. Nongken 58, the author found one spontaneous male-sterile plant. The tillers of this material heading before Sept. 3 were sterile, but fertile after Sept. 8. Results obtained from many years experiments are as follows: (1) The F1 of the male-sterile plant when crossed with any Geng-type rice produces fertile plants under long-day or short-day conditions. (2) The F1 of reciprocal crosses produces no sterile plant under long-day or short-day conditions. (3) The Geng-type sterile plant when crossed with Geng-type hybrid F1 produces both sterile and fertile plants in a ratio of 1:1 under a long-day condition. (4) The F2 Geng-rice hybrids, whether from crosses or reciprocal crosses are segregated into about 1/4 sterile plants and 3/4 fertile plants under a long-day condition. In 1984, Deng Jingyang made analysis of the data obtained and took this phenomena to be controlled by a pair of photosensitive recessive male-sterile key-genes not hitherto reported, which is given the name Hubei photosensitive genic male-sterile rice. Photosensitive male-sterile rice is a typical example of physiological genetics, and can be used for multiple breeding in the following aspect: (1) It can be utilized to create heterosis. The sterile material can reproduce itself by selfing under short-day condition, and the crosses can be made under long-day condition to produce hybrids. The male parents can be obtained by extensive screening (including the use of newly-bred varieties and strains). It is simpler and more economical than the present three-line-hybrid-rice of nucleo-cytoplasmic interaction; (2) Following the utilization of F1 heterosis, superior fertile plants from the offsprings can be selected to obtain new varieties; (3) It also can be employed in the composite crossing and recurrent selection for the accumulation of useful genes to improve populations so that outstanding varieties can be bred; (4) It is a more convenient and efficient in making crosses between Xian-type rice (Subsp. indica) and Geng- type rice.

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Accession: 006630010

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