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对中高秆弯曲穗型杂交粳稻组合辽优5218、屉优418、辽优2005、辽优2006、辽优2016在较高肥力条件下的抗倒伏能力进行了分析。结果表明,这些中高秆弯曲穗型杂交粳稻组合具有抗倒伏能力较强的理想茎秆物理性状:地上部第1,2伸长节间长度短,穗颈节间和稻穗较长,基部茎秆截面椭圆长轴、短轴较长,面积较大,茎壁较厚,茎壁截面积大,植株表现抗倒伏能力强;在育种和栽培实践中,通过减少第1,2伸长节间长度,增强茎秆基部物理强度,降低穗位,增加穗长和穗颈节间长度等,可以提高中高秆弯曲穗型杂交粳稻植株的抗倒性,使倒伏与株高和生物产量的矛盾在更高产水平上得到统一。
The lodging resistance of middle-high stalks with curved panicle type japonica hybrid rice Liaoyou 5218, Youyou 418, Liaoyou 2005, Liaoyou 2006 and Liaoyou 2016 was analyzed. The results showed that these combinations of mid-high-stalk and bent-ear panicle japonica hybrid rice had the ideal physical characteristics of lodging resistance with strong lodging resistance: the length of the first and second elongate internodes were short, the internodes and ear were longer, The short axis of the stalk section is longer, the area is larger, the stem wall is thicker, the cross-sectional area of the stem wall is larger, and the plant has the ability of lodging resistance. In breeding and cultivation practice, Length, the physical strength of the base of the stalk, the decrease of the ear position, the increase of the spike length and the length of the panicle neck, etc. can increase the lodging resistance of the hybrid tall rice with medium and high stalk, and the contradiction between plant height and biomass Higher level of production to be unified.