Liu Qi-hua, Zhou Xue-biao, Yang Lian-qun, Li Tian, Zhang Jian-jun
Shandong Rice Research Institute, Ji'ning 272177, Shandong, China.
Ying Yong Sheng Tai Xue Bao. 2009 Sep;20(9):2135-41.
In a pot experiment, rice plants were shaded during the period from transplanting to booting, aimed to study the effects of early growth stage shading on the rice growth at grain-filling stage. Comparing with the control, early growth stage shading decreased the tiller number by 26.72%, but increased the flag leaf area and soluble sugar content by 33.86% and 30.23%, respectively. The filled-grain number per panicle, 1000-grain mass, ultimate brown rice mass, and maximum and average grain-filling rates decreased by 8.65%, 4.81%, 9.74%, 20.22%, and 19.13%, and the effective panicle number and grain yield declined by 25.26% and 39.56%, respectively. The peak time of grain-filling rate (Tm) advanced 1.66 days, while the grain-filling time (T99) prolonged 6.80 days. For shading-tolerance variety, its flag leaf Chl a, Chl b, and Chl (a + b) contents at early and mid grain-filling stages, and the protein N and soluble sugar contents and Chl a/b in its flag leaves at grain-filling stage all increased under early growth stage shading, and the ultimate brown rice mass and 1000-grain mass maintained at the similar levels as the control. Consequently, its grain yield reduction rate was lower than that of shading-sensitive variety.
在盆栽试验中，水稻植株在移栽至孕穗期进行遮光处理，旨在研究生育前期遮光对水稻灌浆期生长的影响。与对照相比，生育前期遮光使分蘖数减少了26.72%，但使剑叶面积和可溶性糖含量分别增加了33.86%和30.23%。每穗实粒数、千粒重、最终糙米质量以及最大和平均灌浆速率分别降低了8.65%、4.81%、9.74%、20.22%和19.13%，有效穗数和籽粒产量分别下降了25.26%和39.56%。灌浆速率峰值时间（Tm）提前了1.66天，而灌浆时间（T99）延长了6.80天。对于耐荫品种，在生育前期遮光条件下，其灌浆前期和中期剑叶叶绿素a、叶绿素b和叶绿素（a + b）含量，以及灌浆期剑叶蛋白质氮、可溶性糖含量和叶绿素a/b均增加，最终糙米质量和千粒重维持在与对照相似的水平。因此，其籽粒产量降低率低于对光敏感品种。
