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The effects of mixed direct seeding of parental lines with different hull colors on the seed production of hybrid rice

机译：不同船体不同母线混合直接播种对杂交稻种子生产的影响

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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 2~6?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.
机译：杂交水稻种子的常规生产是基于播种和移植父母线（'单独播种和移植'，SST）。为了减少现场管理的劳动力投入，在直接将两个父母作为混合物（“混合直接播种”，MDS）的策略下实施了一种省力模型以产生杂种种子。该策略利用了“黄壳/红船体”对，确保在混合收获后可以容易地与雄性父母容易地分离出女性父母。为了评估MDS对种子生产的影响，测试了两对，P88S / G-4和Y58S / G-15，并与2015年和2016年的女性/雄性种子比的SST下的那些相​​比。两对同步开花的父母线，并且雄性无菌线在SST中呈现出高的总颗粒耗能率，范围为75.82％至93.27％。在成熟时，在种子父母上产生的杂种种子与来自花粉父母的那些收获，后来，在机器上以99.90％的正确率成功地分类。在MDS中，测试线的标题日期为2〜6？天。交叉率提高了8.59％和7.61％，总穗数分别增加了4.78％和5.80％。最终，MDS中的实际产量显着超过12.56％的P88S / G-4和8.95％的Y58S / G-15。该模型通过颜色分选成功地回收杂种种子，似乎有望降低杂种种子生产中的劳动力投入。

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