---

期 刊 ：植物遗传资源学报 2016年 17卷 5期

关键词：直立穗突变体；抗倒伏性；遗传力；配合力；

Keywords:Erect Impact Mutant, Lodging Resistance, Heritability, Combining Ability,

摘 要 ：为研究直立穗突变体R1338和R334在抗倒伏特性方面的遗传力与配合力，选用弯曲穗型不育系川农1A、ABG15s和两个含有DEP1直立穗基因的直立穗不育系E69A、E102A，与蜀恢498及其直立穗突变体R1338、R334进行不完全双列杂交，比较F1基部各节的抗倒伏特性。发现F1基部各节抗折力与倒伏指数呈极显著负相关性，抗折力与茎节的直径和茎壁厚度成极显著正相关；通过回归分析发现影响水稻基部节抗倒伏能力的主要影响因子为茎节的抗折力和弯曲力矩，抗折力越大、弯曲力矩越小其倒伏指数也就越低；2个直立穗突变体基部节倒伏指数的一般配合力效应值均低于野生型，其中R1338的倒伏指数的一般配合力效应值更低一些。因此利用直立穗亲本配组可以显著杂交后代的抗倒伏能力。

Abstract:To study the heritability and combining ability of lodging resistance for erect panicle mutant of R1338 and R334, the incomplete diallel developed on Shuhui 498 and its erect panicle mutant R1338, R334, and two type CMS one is Chuannong 1A, ABG15s for bending panicle, and anther are E69A, E102A for erect panicle which both contain DEP1 erect panicle gene, for comparing the lodging resistance of the base stem of F1. It get that flexural strength and the lodging index of base stem of F1 showed a significant negative correlation. In contrast, the flexural strength and diameter and wall thickness of stem showed a significant positive correlation. By regression analysis showed that the major factors are flexural strength bending moment for lodging resistance of rice base stem. The lodging index reduced with increasing bending force and bending moment and reduce. GCA value of two upright panicle mutant basal lodging index was lower than that of wild type, and R1338 is the lowest. So for combination to choose erect panicle parents can easier get significantly hybrids lodging capacity.

---