高大韧稻茎秆的抗折力研究

The Breaking Resistance of Higher,Thicker,and Tougher Rice

以通过审定的高大韧稻新组合特优1012、中优253与2个大面积推广的杂交稻组合为材料,研究了高大韧稻与非高大韧稻的农艺性状和茎秆结构性状。结果表明,与矮秆水稻相比,高大韧稻特优1012、中优253的株高、剑叶长、宽,穗粒数、产量等都明显的高于其他的2个杂交组合;第一、二、三节间的抗折力更具有明显的优势。相关分析表明,水稻的抗折力与节间长度呈负相关,与节间粗度、厚度及干物重间呈正相关;其中抗折力与小维管束数目的相关系数最大,达0.974。

Two new higher, thicker, and tougher （HTT） rice hybrid combinations Teyou 1012, Zhongyou 253 with two wildly used hybrids were employed to study the agronomic traits and culm structure traits. The result showed that the HTT rice was superior to the other two hybrids in terms of plant height, the length and width of the flag leaf, the number of grains per panicle, and yield; and HTT rice were even more superior to the other two hybrids in terms of the breaking resistance of the first, second and third internode. The correla- tion analysis showed that the breaking resistance was negatively correlated with the length of the internodes, and positively correlated with the diameter, the wall thickness and the dry matter weight of the internodes; the correlation coefficient between the breaking resistance and the number of small vascular bundle was very high, 0.9744.