爆米花爆褶的QTL分析及两种环境下QTL的一致性

LI Yu-Ling, DONG Yong-Bin, NIU Su-Zhen
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引用次数: 21

摘要

爆褶是爆米花最重要的品质性状。以玉米自交系丹232与玉米自交系N04杂交获得的259个F2:3家族为材料,在2种环境下进行了重复试验,对其爆褶进行了评价。从筛选到的613对SSR引物中,筛选出183对构建遗传连锁图谱,遗传距离为1 762.2 cM (cM),平均每个标记的遗传距离为9.63 cM。利用复合区间作图(CIM)方法鉴定了数量性状位点(QTL),并对其遗传效应进行了估计。采用多区间映射法计算检测到的qtl之间的相互作用。总共检测到22个qtl,其中只有5个qtl在两个环境下是共同的。单个QTL对表型变异的贡献率在3.07% ~ 12.84%之间,两种环境下所有QTL的总贡献率分别为66.46%和51.90%。qPF-6-1、qPF-8-1和qPF-1-3三个qtl的贡献率大于10%。多数qtl的加性效应大于显性效应。春播表现出加性效应、部分显性效应、显性效应和过显性效应的qtl分别为4个、5个、0个和2个,夏播表现出2个、5个、2个。表达AA、DA或DD互作的qtl对或maker区间仅为2.60%。
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QTL Analysis of Popping Fold and the Consistency of QTLs Under Two Environments in Popcorn

Popping fold (PF) is the most important quality trait in popcorn. In this study, a total of 259 F2:3 families, derived from the cross between a dent corn inbred Dan232 and a popcorn inbred N04, were evaluated for their popping folds in replicated experiments under two environments. Of 613 simple sequence repeat (SSR) primer pairs screened, 183 pairs were selected to construct a genetic linkage map with the genetic distance of 1 762.2 cM (centimorgan) and on average 9.63 cM every marker. Quantative trait loci (QTL) were identified, and their genetic effects were estimated using CIM (composite interval mapping) method. The interactions among QTLs detected were calculated using MIM (multiple interval mapping) method. In all, 22 QTLs were detected, and only 5 of them were common under two environments. Contribution to phenotypic variation of a single QTL varied from 3.07% to 12.84%, and total contributions of all QTLs under two environments were 66.46% and 51.90%, respectively. Three QTLs (qPF-6-1, qPF-8-1 and qPF-1-3) with more than 10% contributions were observed. The additive effects were larger than dominant effects for most QTLs. The amount of QTLs showing additive, partially dominant, dominant and over-dominant effects were 4, 5, 0, 2 in spring sowing and 2, 5, 2, 2 in summer sowing, respectively. There were only 2.60% pairs of QTLs or maker intervals expressing AA, DA or DD interactions.

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