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探讨了杂交晚稻不同产量性能品种苗期秧苗弱化处理后大田期恢复正常管理下分蘖及内源激素动态,产量及其构成因素的差异性,结果表明2个水稻品种低素质秧苗条件下的产量及其构成因素均呈现不同程度下降,超级稻品种五丰优T025和对照品种昌优10号低素质秧苗较正常秧苗产量、单株有效穗数、每穗总粒数、结实率、千粒质量分别下降5.03%和6.97%、12.11%和10.50%、5.84%和7.21%、4.46%和9.0%、2.52%和4.05%;低素质秧苗下,五丰优T025较昌优10号单株茎蘖数上升速度快,苗峰值高,下降更为平缓;2个水稻品种大田倒二叶ABA含量均随生育推进持续升高,ZR含量持续下降,IAA和GA3含量先升后降,抽穗期达峰值;低秧苗素质下五丰优T025各生育阶段ABA含量明显低于昌优10号,ZR含量均明显高于后者;总体上,五丰优T025正常秧苗下各生育阶段IAA和GA3含量高于低素质秧苗,昌优10号则相反;2个水稻品种不同秧苗素质下分蘖盛期至抽穗期生长促进类激素总和(IAA+ZR+GA3)与ABA的比值呈上升走势,后开始下降;2个水稻品种齐穗后生长促进类激素IAA、ZR、GA3与生长抑制类激素ABA的比值均是正常秧苗低于低素质秧苗。双季杂交晚稻秧苗期生理性胁迫—大田恢复解除下反弹性生长补偿能力与品种产量稳定性能密切相关。
The differences of tillering, endogenous hormones, yield and their components in hybrid rice with different yield and qualities after seedling weakened at late seedling stage were studied. The results showed that the yield, The components of which all showed different degrees of decline. The super rice Cultivars Wufengyou T025 and the control variety Changyou10 were better than the normal seedlings, the effective spikes per panicle, the total grains per panicle, the seed setting rate and the grain weight per thousand Decreased by 5.03% and 6.97%, 12.11% and 10.50%, 5.84% and 7.21%, 4.46% and 9.0%, 2.52% and 4.05%, respectively. Under low-quality seedlings, The ABA content in the second leaf of two rice cultivars continued to increase with the growth and development, while the content of ZR decreased continuously. The content of IAA and GA3 first increased and then decreased, reaching the peak value at heading stage. Under low seedling quality, the content of ABA in all five growth stages of Wufengyou T025 was significantly lower than that of Changyou 10, and the content of ZR was significantly higher than that of the latter. Overall, the contents of IAA and GA3 in all growth stages of Wufengyou T025 Quality seedlings, Changyou 10, on the contrary; 2 rice The ratio of IAA + ZR + GA3 to ABA increased from tillering stage to heading stage at different tillering stages and then began to decrease. After heading, the two rice cultivars promoted the IAA, ZR, GA3 and growth inhibition hormone ABA ratio are normal seedlings lower than the low-quality seedlings. Physiological Stresses of Seedling Stage in Double - season Hybrid Late Rice Seedlings - The ability of springback compensatory growth compensation under field recovery was closely related to the yield stability of cultivars.