【摘要】 以22个中籼稻品种(组合)为对象,研究了水稻倒伏的敏感期和敏感节位,及倒伏指数与茎秆性状的相关性。结果表明:水稻的倒伏敏感期是在齐穗后21～28d,敏感节位是基部第一个伸长节间;相关分析和通径分析表明倒伏指数与节间长、基部节间到穗顶的长和基部节间至穗顶的鲜重呈极显著正相关,与基部节间外径、基部抗折力、基部节间壁厚、单位节间干重和秆形指数呈极显著负相关。抗折力对倒伏指数的负向直接作用最大,其次是单位节间干重。说明改善水稻茎秆的质地结构、增加基部节间的充实度是提高水稻的抗倒伏能力的关键。更多还原

【Abstract】 22 rice cultivars was used to study the lodging sensitive period、the sensitive iternode and the correlation between the culm traits and lodging index. The Results indicate that the lodging sensitive period was 25d all so after full heading; the sensitive internode was first elongating internode from basal. The result of correlation and path analysis indicate that Lodging index was positive correlation with the length of internode、the length from the basal internode to top and the weight from the basal internode to top, and negatively correlation with the internode cross-sectional thickness、the thick of culm、the dry weight of 1cm internode and the breaking-resistant strength. The direct action of the breaking-resistant strength was largest and the second was the dry weight per unit internode. The results showed that the breaking-resistant strength of basal culms was a good parameter for quantifying the culms intensity.更多还原