Genetic Analysis of Seedling Growth under Cold Temperature Stress in Grain Sorghum
Genetic Analysis of Seedling Growth under Cold Temperature Stress in Grain Sorghum
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DOI：
10.2135/cropsci2001.4151438x
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发表时间：
2001-09
期刊：
影响因子：
2.3
通讯作者：
Jianming Yu;M. Tuinstra
中科院分区：
文献类型：
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作者：
Jianming Yu;M. Tuinstra
种植高粱[Sorcerium bicolor（L.）在季节早播种有助于延长生长季节，更有效地利用春末和初夏的降雨，但早播种会受到低温条件下幼苗活力差的阻碍。耐寒性的来源已经确定，但很少有人知道这个特性的遗传。本研究采用二次设计交配方案，对不同遗传多样性的高粱品系在低温条件下幼苗生长特性的配合力进行了测定。在田间早期和正常种植条件下对亲本系和杂交种进行了评估。测定的性状包括出苗率、出苗指数、叶片数、活力和干重。条目之间存在显著差异。在杂种间，这些差异主要是由于一般配合力的影响。这些结果表明，在高粱幼苗活力育种中，一般配合力比特殊配合力更重要。杂种优势对所测的所有苗期性状都有有利的影响。
Planting of grain sorghum [Sorghum bicolor (L.) Moench] earlier in the season should contribute to a longer growing season and more effective utilization of late spring and early summer rainfall, but early planting is hindered by poor seedling vigor under cold temperature conditions. Sources of cold tolerance have been identified, but little is known about the inheritance of this trait. This study was conducted to determine combining ability for seedling growth characteristics under cold temperature conditions in genetically diverse sorghum lines using a Design-II mating scheme. Parental lines and hybrids were evaluated under early and normal planting conditions in the field. The traits measured included emergence, emergence index, leaf number, vigor, and dry weight. Significant differences were observed among entries. Among hybrids, these differences were primarily due to effects of general combining ability. These results indicate that general combining ability is more important than specific combining ability in breeding for seedling vigor in sorghum. Heterosis had favorable effects on all seedling traits measured.