不同种植密度条件下玉米茎秆穿刺强度QTL分析

QTL Analysis for Rind Penetrometer Resistance(RPR) in Maize under Different Plant Densities

以四287与四144为亲本组配的188个F2:3家系为材料,分别于2013、2014年在2个种植密度下调查茎秆穿刺强度,采用复合区间作图法进行QTL分析,研究玉米茎秆穿刺强度在不同种植密度下的遗传机制。结果表明,在2个种植密度下,共检测到13个与茎秆穿刺强度相关的QTL,分布于玉米的第1、2、3、4、6、7、8、9染色体上,单个QTL可解释3.8%~11.8%的表型变异,位于第6染色体检测到的QTL在所有环境中均能稳定表达。

To investigate the genetic basis for rind penetmmeter resistance（RPR） under different plant densities in maize, an F：：3 population with 188 families from the cross between Si287 and Si144 was developed. The 188 F3 lines were evaluated for PRP under two plant densities in 2013 and 2014. QTL analysis was carried out to determine the relationship between marker genotype and RPR evaluated using composite interval mapping（CIM）. A total of 13 QTLs were identified on chromosomes 1, 2, 3, 4, 6, 7, 8 and 9, each QTL explained phenotypic variation ranging from 3.8% to 11.8%. Among these, the QTL on chromosome 6 for RPR was detected in each environment.