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Early harvesting improves seed vigour of hybrid rice seeds

机译：早期收获提高了杂交水稻种子的种子活力

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摘要

Maturity stage in harvesting time greatly affects seed vigour. This work aimed to scientific harvesting time of hybrid rice for being high vigour with high & stable seed yield. Field experiments of different harvesting time were conducted in 2013–2014, and germination percentage (GP), vigour index (VI), seed moisture content and 1000-grain weight was determined. Both GP and VI progressively increased to peaks and then began to decline with harvesting time delayed, and the regression coefficients of varieties were ranged from 0.7214 to 0.9066. In addition, difference values between tangent points (ΔX) of GP were higher than that of VI according to the quadratic functions. Based on seed vigour through the divided range from 75% to 125% of peak value, optimum harvesting time of IIY-416, JY-167, Yliangyou-1 (YLY-1) ranged from 17 to 27, 15 to 23 and 17 to 23 days after the completion of artificial pollination (DACAP), respectively. Moreover, when seedlots harvested from 17 to 23 DACAP, no significant difference was found on 1000-grain weight and the seed moisture content was kept relatively low (19–25%). Therefore, it can be concluded that hybrid rice seed can be earlier-harvest based on seed vigour, and 17 to 23 DACAP can be recommended as optimum harvesting time during hybrid rice seed production.
机译：收获期的成熟阶段极大地影响种子活力。这项工作旨在科学地培育杂交水稻，使其具有高活力，高产量和稳定的种子产量。在2013-2014年进行了不同收获时间的田间试验，确定了发芽率（GP），活力指数（VI），种子含水量和1000粒重。随着收获时间的延迟，GP和VI均逐渐升高至峰值，然后开始下降，品种的回归系数介于0.7214至0.9066之间。另外，根据二次函数，GP的切点之间的差值（ΔX）高于VI的切点之间的差值。根据种子活力的峰值范围（最大值的75％至125％），IIY-416，JY-167，Yliangyou-1（YLY-1）的最佳收获时间范围为17至27、15至23和17至分别完成人工授粉（DACAP）后的23天。此外，当收获17至23 DACAP的种田时，在1000粒重上没有发现显着差异，并且种子含水量保持相对较低（19–25％）。因此，可以得出结论，杂交稻种子可以根据种子的活力而提前收获，建议在杂交稻种子生产过程中将17到23 DACAP作为最佳收获时间。

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