Morphological and cytogenetical studies of the hybrids between Oryza sativa and Oryza officinalis

Yan HuiHuang; Hu HuiYing; Fu Qiang; Yu HanYong; Tang ShenXiang; Xiong ZhenMin; Min ShaoKai

Chinese Journal of Rice Science 10(3): 138-142


ISSN/ISBN: 1001-7216
Accession: 002899800

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Three interspecific crosses were carried out involving 2 accessions of O. officinalis, with resistance to brown planthopper (BPH) [Nilaparvata lugens], and 2 improved susceptible lines of Oryza sativa, and F1, F2 and BC1F1 hybrids were produced via embryo culture. The F1 hybrids showed traits characteristic of O. officinalis, such as purple stigmas, long awns and BPH resistance, and were male-sterile due to the low frequency of chromosome pairing (0.77 bivalents) or failure of anther formation. However, one F2 plant was obtained, with a chromosome number of 2n = 46. BC1F1 plants resulting from backcrossing to O. sativa were allotriploid (AAC), with a chromosome configuration of 12.25I + 11.85II + 0.01III at metakinesis I.