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选取4个超高产杂交稻组合,对其茎秆特征与抗倒性的关系进行了研究。结果表明:蜡熟期(成熟前15~20 d)为倒伏发生的敏感始期;株高、短轴直径、倒2节间长度和倒4节间长度与茎秆承载能力的偏相关系数达到显著或极显著水平;株高的增加虽然能增强茎秆的承载能力,但挫折重并没有增加;短轴直径对增强茎秆的承载能力较长轴直径更重要;缩短基部节间长度(特别是缩短倒2节间和倒4节间的长度)增加顶部节间长度能增强茎秆承载能力。在超高产水稻抗倒伏育种中,宜选择和培育中秆、圆秆、基部节间短、倒1节间长的亲本和组合。
Four super-high-yielding hybrid rice combinations were selected to study the relationship between stalk traits and lodging resistance. The results showed that the wax ripening stage (15-20 days before maturity) was the sensitive initial stage of lodging. The partial correlation coefficients of plant height, short axis diameter, length of 2 internodes and length of 4 inverses and the bearing capacity of stalks reached significant Or extremely significant level. Although the increase of plant height could enhance the bearing capacity of stalks, the increase of stalk weight did not increase. The short axis diameter was more important for enhancing the bearing capacity of stalks than the longer axis diameter. Shortening the length of basal internode Shorten the length between the 2 and 4 inverted sections) Increasing the length of the internode increases the stalk carrying capacity. In super high yielding rice lodging breeding, should select and cultivate medium stalk, round stalk, basal internodes short, down 1 internodes of parents and combinations.