培育抗倒能力强的超高产品种是水稻高产、优质、安全生产的重要课题。本研究旨在探讨超级稻连粳7号的抗倒生理特性,为超高产育种提供理论依据。以抗倒伏超级稻连粳7号为试验材料,不抗倒品种中粳12-9为对照,设置不同氮素水平,以倒伏指数作为衡量植株抗倒伏能力的指标。在齐穗后25 d,研究水稻基部第1节间(I1)、第2节间(I2)、第3节间(I3)、第4节间(I4)抗倒伏能力和主要物理性状的差异,并对倒伏指数、抗折力与茎秆主要物理性状进行相关分析,结果表明超级稻连粳7号倒伏指数低、抗倒伏能力强的主要原因是:(1)I1和I2短,在试验范围内株高增高幅度小;(2)叶鞘干质量大,单位节间干质量大,茎秆的充实度好;(3)基部节间抗折力与茎壁厚、茎秆干质量、叶鞘干质量、单位节间干质量、节间至顶鲜质量呈显著或极显著正相关,与株高、重心高度、相对重心高度、茎秆粗、节间基部至顶长无显著相关关系。超级稻连粳7号基部节间短,茎秆充实程度好是抗折力大、倒伏指数小、抗倒伏能力强的直接原因。 Breeding anti-collapse ability of super-high-yield rice is high yield, high quality, safe production of an important issue. The purpose of this study was to investigate the lodging resistance trait of Super Rice Lianjing 7 and to provide a theoretical basis for super-high-yielding breeding. Taking Liangyou 7, an anti-lodging super rice, as test material, non-anti-down varieties, Zhongjing 12-9, were used as control to set different nitrogen levels, and the lodging index was taken as an index to measure the lodging resistance of plants. At 25 days after heading, the differences in lodging resistance and main physical traits between the first internode (I1), the second internode (I2), the third internode (I3), the fourth internode (I4) The results showed that the lodging index of super hybrid rice Lianjing 7 was low and the lodging resistance was strong. The main reasons were: (1) I1 and I2 were short, and in the experiment (2) The leaf sheath dry mass is large, the unit leaf dry mass is large and the stem fullness is good. (3) The ultimate strength of the basal internode is related to the wall thickness of the stem, the dry mass of the stem, There was a significant or very significant positive correlation between dry mass, dry weight per plant and fresh weight at internode, but no significant correlation with plant height, center of gravity, relative center of gravity, stem diameter and internode length from top to bottom. Super rice with japonica 7 on the basis of short internodes, stalk full of good degree of good anti-stress, lodging index is small, strong resistance to lodging the direct cause.