期刊
THEORETICAL AND APPLIED GENETICS
卷 134, 期 4, 页码 1185-1200出版社
SPRINGER
DOI: 10.1007/s00122-020-03763-1
关键词
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资金
- USDA Biotechnology Risk Assessment Program [2012-01658]
- NIFA Global Food Security CAP [2015-68004-23492]
- United States Agency for International Development (USAID) Bureau for Resilience and Food Security as part of Feed the Future Innovation Lab for Climate Resilient Sorghum [AID-OAA-A-13-00044]
Comparing populations derived from polyploid Sorghum halepense and its progenitors helped improve understanding of plant architecture, revealing genetic novelty in S. halepense that may be valuable for sorghum improvement. Analysis of quantitative traits in tetraploid S. halepense showed potential opportunities for sorghum improvement through the discovery of new alleles associated with elite sorghum traits. The abundance of unique QTLs in S. halepense populations, potentially arising from polyploidy and 'diploidization' processes, indicate a rich collection of novel alleles that could be beneficial for sorghum enhancement.
Key message Comparing populations derived, respectively, from polyploid Sorghum halepense and its progenitors improved knowledge of plant architecture and showed that S. halepense harbors genetic novelty of potential value for sorghum improvement Vegetative growth and the timing of the vegetative-to-reproductive transition are critical to a plant's fitness, directly and indirectly determining when and how a plant lives, grows and reproduces. We describe quantitative trait analysis of plant height and flowering time in the naturally occurring tetraploid Sorghum halepense, using two novel BC1F2 populations totaling 246 genotypes derived from backcrossing two tetraploid Sorghum bicolor x S. halepense F-1 plants to a tetraploidized S. bicolor. Phenotyping for two years each in Bogart, GA and Salina, KS allowed us to dissect variance into narrow-sense genetic (QTLs) and environmental components. In crosses with a common S. bicolor BTx623 parent, comparison of QTLs in S. halepense, its rhizomatous progenitor S. propinquum and S. bicolor race guinea which is highly divergent from BTx623 permit inferences of loci at which new alleles have been associated with improvement of elite sorghums. The relative abundance of QTLs unique to the S. halepense populations may reflect its polyploidy and subsequent 'diploidization' processes often associated with the formation of genetic novelty, a possibility further supported by a high level of QTL polymorphism within sibling lines derived from a common S. halepense parent. An intriguing hypothesis for further investigation is that polyploidy of S. halepense following 96 million years of abstinence, coupled with natural selection during its spread to diverse environments across six continents, may provide a rich collection of novel alleles that offer potential opportunities for sorghum improvement.
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