不同环境条件下水稻生育期和株高的QTL分析

Comparative Mapping of Quantitative Trait Loci for Heading Date and Plant Height in Cultivated Rice (Oryza sativa L.) across Environments

利用籼稻品种窄叶青 8号 (ZYQ8)和粳稻品种京系 17(JX17)为亲本构建的加倍单倍体 (doubled haploid,DH)群体及其分子连锁图谱 ,在 5个环境中对生育期和株高进行 QTL 比较分析。结果表明 ,共检测到 10个 QTL,两种环境以上能重复检出的 QTL9个 ,这些 QTL 在不同的环境中的加性效应方向一致 ,但遗传效应差异较大 ;其中没有 1个QTL 在 5种环境中均能定位 ,表明数量性状基因的表达易受环境的影响。根据不同环境条件的主要差异和 QTL 表现 ,初步确定第 8染色体上影响生育期的 QTL q H D8和株高相关的 QTL q PH8在长日条件下表现遗传效应 ;第 1和第 10染色体上分别控制生育期和株高的 QTL q H D1和 q PH10在短日下发挥作用。

A doubled haploid (DH) population derived from indica/japonica cross and its genetic linkage map were employed to map quantitative trait loci (QTL) underlying rice heading date and plant height in five environments. A total of 10 QTLs for heading date (HD) and plant height (PH) were detected that were significant in at least one environment, 9 were significant in two environment, but no one were significant in all five environments. Evidence of genotype by environment interaction was found and the interaction was trait dependent. According to QTL×environments interaction effects, a major QTL, qHD8 and a mini QTL, qPH8 on chromosome 8 might express under long photoperiod condition, while two mini QTL, qHD1 and qPH10 on chromosome 1 and 10, respectively, might do under short photoperiod.