水稻核心种质资源茎秆抗倒伏性研究

为了探究不同株高、重心高度及基部茎秆性状对水稻抗倒伏能力的影响,以533份水稻核心种质资源为试验材料,在2种栽培条件下,对10个性状进行相关分析和通径分析,结果表明:低株高水稻基部第1节间壁厚和基部抗折力对倒伏指数有协同作用,低株高水稻抗倒伏茎秆性状改良应集中在基部第1节间茎粗、壁厚,高株高水稻倒伏性更易受株高和重心高度的影响,高株高水稻抗倒伏性状改良应集中在基部第2节间茎粗,增强水稻茎秆基部抗折力是提高不同株高水稻抗倒伏能力的途径之一。

Stem lodging resistance of rice core germplasm

In order to explore the effects of different plant height,center of gravity height and basal stem traits on lodging resistance of rice,10 traits of 533 rice core germplasm under two cultivation modes including pot culture and field culture were analyzed with correlation and path analysis. The results showed that the first internode wall thickness and basal stem breaking resistant strength of the low plant rice had synergy on the lodging index,indicating that improving lodging resistance of low-plant rice should focus on the first internode stem thickness and wall thickness. The lodging of high-plant rice is more affected by plant height and height of gravity center,indicating that improving lodging resistance of high-plant rice should concentrate in the second internode stem thickness. The improvement of lodging resistance of rice germplasm with different plant height can be achieved by enhancing the bending strength of rice basal stem. It will provide an important reference for improving lodging resistance of rice with different plant height.