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Quantitative trait mapping of plant architecture in two BC1F2 populations of Sorghum Bicolor × S. halepense and comparisons to two other sorghum populations
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...
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Published in: | Theoretical and applied genetics 2021-04, Vol.134 (4), p.1185-1200 |
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Main Authors: | , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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 BC
1
F
2
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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ISSN: | 0040-5752 1432-2242 |
DOI: | 10.1007/s00122-020-03763-1 |