Du Lei, Zhang Hao, Xin Wangsen, Ma Kejun, Du Dengxiang, Yu Changping, Liu Yongzhong
National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China.
Maize Breeding Research Institute, Shiyan Academy of Agricultural Sciences, Shiyan 442000, China.
Plants (Basel). 2021 Jul 31;10(8):1585. doi: 10.3390/plants10081585.
In the field, maize flowering time and height traits are closely linked with yield, planting density, lodging resistance, and grain fill. To explore the genetic basis of flowering time and height traits in maize, we investigated six related traits, namely, days to anthesis (AD), days to silking (SD), the anthesis-silking interval (ASI), plant height (PH), ear height (EH), and the EH/PH ratio (ER) in two locations for two years based on two doubled haploid (DH) populations. Based on the two high-density genetic linkage maps, 12 and 22 quantitative trait loci (QTL) were identified, respectively, for flowering time and height-related traits. Of these, ten QTLs had overlapping confidence intervals between the two populations and were integrated into three consensus QTLs (, , and ). Of these, , conferring flowering time, is located at 221.1-277.0 Mb on chromosome 1 and explained 10.0-12.5% of the AD and SD variation, and , conferring height traits, is located at 147.4-217.3 Mb on chromosome 5 and explained 11.6-15.3% of the PH and EH variation. These consensus QTLs, in addition to the other repeatedly detected QTLs, provide useful information for further genetic studies and variety improvements in flowering time and height-related traits.
在田间，玉米开花时间和株高性状与产量、种植密度、抗倒伏性和籽粒灌浆密切相关。为了探究玉米开花时间和株高性状的遗传基础，我们基于两个加倍单倍体（DH）群体，在两个地点连续两年对六个相关性状进行了调查，即散粉天数（AD）、吐丝天数（SD）、散粉-吐丝间隔（ASI）、株高（PH）、穗位高（EH）以及穗位高与株高之比（ER）。基于两张高密度遗传连锁图谱，分别鉴定出了12个和22个与开花时间和株高相关性状的数量性状位点（QTL）。其中，有10个QTL在两个群体间具有重叠的置信区间，并被整合为3个一致性QTL（、和）。其中，位于第1染色体221.1 - 277.0 Mb处，控制开花时间，解释了AD和SD变异的10.0 - 12.5%；位于第5染色体147.4 - 217.3 Mb处，控制株高性状，解释了PH和EH变异的11.6 - 15.3%。这些一致性QTL以及其他重复检测到的QTL，为进一步开展开花时间和株高相关性状的遗传研究及品种改良提供了有用信息。
