叶鞘对杂交水稻茎秆抗倒能力的影响研究

为了明确叶鞘对杂交水稻茎秆抗倒能力的影响,选取4个杂交水稻品种,研究了其基部节间包鞘及去鞘的抗折力差异和基部节间叶鞘的包茎层数、包茎厚度、存活数量及其与节间包鞘抗折力的相关性.结果表明,基部节间包鞘的抗折力是去鞘的1.4～1.9倍,去鞘后的抗折力较包鞘的降幅24.3％-46.8％,叶鞘在齐穗期对抗倒性弱的品种影响大,而...

Effects of Leaf Sheath on Stem Lodging Resistance of Hybrid Rice

To clarify the effects of leaf sheath on the stem lodging resistance of hybrid rice,four hybrid rice varieties were selected to study the difference of the breaking-resistant strength of basal internodes with and without leaf sheath,the number of leaf sheath layers,the thickness of leaf sheath and the survival leaf sheath number of basal internodes and their correlation to the breaking-resistant strength of basal internodes.The results showed that the breaking-resistant strength of basal internodes with leaf sheath was 1.4~1.9 times that of basal internodes without leaf sheath,and the breaking-resistant strength of basal internodes was reduced by 24.3%~46.8% when the leaf sheath was removed.The leaf sheath had a greater impact on the varieties with weak lodging resistance at heading stage,but on the varieties with strong lodging resistance at mature stage.From heading stage to mature stage,the number of leaf sheath layers,the thickness of leaf sheath and the number of survival leaf sheath all showed a downward trend,the values of leaf sheath characteristics of the varieties with strong lodging-resistance were significantly or very significantly greater than those of the varieties with weak lodging-resistance,and the decreasing range of the varieties with weak lodging-resistance was greater than that of the varieties with strong lodging-resistance.The number of leaf sheath layers,the thickness of leaf sheath and the number of survival leaf sheath were all significantly and positively correlated with the breakingresistant strength of basal internodes with leaf sheath.It is indicated that leaf sheath can significantly improve the lodging resistance of basal internodes of rice,mainly by improving plant morphological and physiological indexes such as the increase in the number of enclosed leaf sheath layers,thickness of leaf sheath,activity of leaf sheath.