Wei Jin-Lian, Pan Xiao-Hua, Deng Qiang-Hui
Ministry of Agriculture Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Jiangxi Agricultural University, Nanchang 330045, China.
Ying Yong Sheng Tai Xue Bao. 2010 Feb;21(2):331-7.
Two experimental glass-houses were utilized to study the effects of nighttime temperature increase (NTI) at different growth stages on the grain yield of double season rice. The NTI from the stage of sowing to panicle differentiation (primary branch differentiation) improved the tillering of rice, and increased the effective panicles. An average 1 degrees C rise in the minimum nighttime temperature (MNT) at this stage increased the grain yield of early and late rice by 10.02% - 13.18% and 6.52% - 7.78% (P < 0.01), respectively. The NTI from the stage of panicle differentiation to heading (10% panicle heading from flag leaf sheath) promoted the spikelet abortion, and reduced the number of developed spikelet. An average 1 degrees C rise in MNT at this stage decreased the grain yield of early and late rice by 3.76% - 6.67% and 3.66% - 6.94% (P < 0.01), respectively. NTI from the stage of heading to maturity decreased the filled grain rate of early rice remarkably, but had an opposite effect on late rice. An average 1 degrees C rise in MNT at this stage induced a grain yield loss by 2.07% - 5.61% (P < 0.05) and a grain yield gain by 1.63% - 2.28% (P < 0.05) for early and late rice, respectively. All the results illustrated that there existed obvious differences in the effects of NTI at different growth stages on the grain yield of double season rice.
利用两个实验温室研究了不同生长阶段夜间温度升高（NTI）对双季稻产量的影响。从播种到幼穗分化（一次枝梗分化）阶段的NTI提高了水稻的分蘖能力，并增加了有效穗数。在此阶段，夜间最低温度（MNT）平均升高1℃，早稻和晚稻产量分别提高10.02% - 13.18%和6.52% - 7.78%（P < 0.01）。从幼穗分化到抽穗（剑叶叶鞘抽出10%的穗）阶段的NTI促进了颖花败育，减少了发育颖花的数量。在此阶段，MNT平均升高1℃，早稻和晚稻产量分别降低3.76% - 6.67%和3.66% - 6.94%（P < 0.01）。从抽穗到成熟阶段的NTI显著降低了早稻的结实率，但对晚稻有相反的影响。在此阶段，MNT平均升高1℃，早稻产量损失2.07% - 5.61%（P < 0.05），晚稻产量增加1.63% - 2.28%（P < 0.05）。所有结果表明，不同生长阶段的NTI对双季稻产量的影响存在明显差异。
