中高秆弯曲穗型杂交粳稻抗倒伏能力分析

Analysis on Lodging Resistance of Japonica Hybrid Rice with Higher Stems and Drooping Panicles

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 capability of five japonica hybrid rice combinations with panicles, including Tiyou 418, Liaoyou 5218, Liaoyou 2005, Liaoyou 2006 and Liaoyou der higher fertility characteristt＇cs of 1 higher stems and drooping 2016 was investigated unconditions. The results showed that these japonica rice hybrids possessed ideal stalk physical odging val cross section, larger resistance, such as shorter basal and second internodes, longer major and minor axis of ooval cross section area, thicker walls and bigger wall cross section area of basal stems, resulting in stronger lodging resistance capability of the plants. By shortening the length of the first and second internodes, improving the physical intensity of basal stalks, lowering the position of panicles and increasing the length of panicles and the neck internodes properly, lodging resistance of japonica hybrid rice with higher stems and drooping panicles could be strengthened. Thus, the contradiction between lodging resistance and high biomass with higher plants could be settled at a higher yield level .