不同植物生长调节剂对水稻灌浆进程及产量形成的影响

Effects of Different Plant Growth Regulators on Rice Grain Filling Process and Yield Formation

通过植物生长调节剂处理调控水稻灌浆进程和产量形成过程,可为进一步阐明水稻灌浆特征、合理调控灌浆进程、充分发挥高产潜力和抗逆生理研究提供理论依据。本研究以籼型杂交稻为试验材料,采用Richards方程拟合,比较海藻糖、黄腐酸、复硝酚钠处理对稻穗各部位籽粒灌浆特征及产量的影响差异。结果表明:1) 植物生长调节剂处理下,各部位籽粒灌浆起始势(R0)、最大灌浆速率(GRmax)、平均灌浆速率(GRmean)、最终粒重(A)均显著提高,活跃灌浆期(D)和有效灌浆期(t99)则明显延长。2) 植物生长调节剂对水稻单株穗数、千粒重、结实率影响并不显著,但显著提升了每穗粒数,进而导致单株颖花量和库容量均显著提高(P 【0.05),进而提高粒重和产量。3) 外源喷施复硝酚钠处理对产量增长效果影响最为显著,其次为黄腐酸,再次为海藻糖。

Regulating rice filling process and yield formation process through plant growth regulator treatment can provide a theoretical basis for further elucidating rice filling characteristics, rationally regulating the filling process, giving full play to high yield potential and stress resistance physiological research. In this study, indica hybrid rice was used as the test material, and the Richards equation was used to compare the effects of trehalose, fulvic acid, and sodium nitrophenolate treatments on the grain filling characteristics and yield of rice panicles. The results showed that: 1) Under the treatment of plant growth regulators, the initial grain-filling potential (R0), maximum grain-filling rate (GRmax), mean grain-filling rate (GRmean), the final grain weight (A) in each part were significantly increased, and active grain-filling period (D) and effective grain-filling period (t99) were obviously prolonged. 2) Plant growth regulators have no significant effect on the number of ears per plant, thousand-grain weight, and seed setting rate, but they significantly increase the number of grains per panicle, which in turn leads to a significant increase in the amount of spikelets per plant and the storage capacity (P