水稻抗倒力及相关抗倒伏性状的QTL分析

QTL Analysis of Lodging Resistance Force and Lodging Resistance-Related Traits in Rice

以典型的籼粳交(窄叶青8号/京系17)的F1花培加倍单倍体为材料,考查了抗倒力、株围、株高、有效穗数、重心高和地上部生物量等抗倒伏相关性状。利用该群体的分子连锁图谱进行QTL区间作图分析,除地上部生物量外,其他5个性状均检测到了相关的QTL,其中与抗倒力、株围、有效穗数相关的QTL各1个,分别位于第8、8和12染色体上,贡献率分别为18.4%、12.6%和10.6%。与株高相关的QTL2个,位于第4和第8染色体上,贡献率分别为12.7%和12.5%。与重心高相关的QTL3个,位于第4、8和10染色体上,贡献率分别为12.5%、14.6%和10.0%。相关分析表明,抗倒力与株围、株高、重心高和地上部生物量均呈极显著正相关。

A set of 127 doubled haploid （DH） lines derived from a cross between an indica parent Zhaiyeqing 8 and a japonica variety Jingxi 17 were used to investigate the traits related to lodging resistance such as the lodging resistance force, plant perimeter, plant height, panicle number per plant, gravity center height and aboveground fresh biomass. The quantitative trait loci （QTLs） were identified based on the molecular linkage map. Except for aboveground fresh biomass, a total of eight QTLs affecting other five traits were detected. One QTL each for lodging resistance force, plant perimeter and panicle number per plant was detected on chromosomes 8, 8 and 12 with the explained variance of 18.4%, 12.6% and 10.6%, respectively. Two QTLs for plant height were located on chromosomes 4 and 8 with the explained variance of 12.7% and 12.5%, respectively. Three QTLs related to gravity center height were on chromosomes 4, 8 and 10 with the explained variance of 12.5%, 14.6% and 10.0 %, respectively. There were significant positive correlations between the lodging resistance force and plant perimeter, plant height, gravity center height and aboveground fresh biomass.