文献类型： 外文期刊

第一作者： Tan Yanning

作者： Tan Yanning;Xu Ke;Sun Zhizhong;Yu Dong;Sun Xuewu;Sheng Xiabing;Yuan Guangjie;Yuan Dingyang;Liu Ling;Sheng Xiabing;Yuan Guangjie;Zeng Jia;Duan Meijuan

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关键词： Hybrid rice; hybrid rice seed production; red-hull line; colour sorting; direct seeding

期刊名称：PLANT PRODUCTION SCIENCE （ 影响因子：2.222； 五年影响因子：2.175 ）

ISSN： 1343-943X

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收录情况： SCI

摘要： Conventional production of hybrid rice seeds is based on sowing and transplanting parental lines separately ('separate seeding and transplanting', SST). To decrease the labour inputs of field management, a labour-saving model was implemented under a strategy of directly seeding the two parents as a mixture ('mixed direct seeding', MDS) to produce hybrid seeds. The strategy utilized a 'yellow-hull/red-hull' pair, ensuring that the female parent could be easily separated from the male parent after mixed harvesting. To assess the effects of MDS on seed production, two pairs, P88S/G-4 and Y58S/G-15, were tested and compared with those under SST at the same female/male seed ratio of 5:1 in 2015 and 2016. The parental lines for two pairs flowered synchronously, and the male sterile lines presented a high total stigma exertion rate in SST that ranged from 75.82% to 93.27%. At maturity, the hybrid seeds generated on seed parents were harvested together with those from pollen parents, and later, the hybrids were successfully colour sorted at a correctness rate of more than 99.90% on a machine. In MDS, the heading date of tested lines was advanced by 2 similar to 6 days. The outcrossing rate was improved by 8.59% and 7.61%, and the total panicle number increased by 4.78% and 5.80%, respectively. Ultimately, the actual yield in MDS significantly exceeded that in SST by 12.56% for P88S/G-4 and 8.95% for Y58S/G-15. This model succeeded in recycling hybrid seeds via color sorting and seems promising for decreasing labour inputs in hybrid seed production. [GRAPHICS] .

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