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Genetic Analysis of Recombinant Inbred Lines for Sorghum bicolor × Sorghum propinquum

Journal Article · · G3
 [1];  [2];  [3];  [2];  [2];  [2];  [2];  [2];  [2];  [3];  [3];  [3];  [2]
  1. University of Georgia, Athens, GA (United States); DOE/OSTI
  2. University of Georgia, Athens, GA (United States)
  3. US Department. of Agriculture (USDA), Lubbock, TX (United States)
We describe a recombinant inbred line (RIL) population of 161 F5 genotypes for the widest euploid cross that can be made to cultivated sorghum (Sorghum bicolor) using conventional techniques, S. bicolor · Sorghum propinquum, that segregates for many traits related to plant architecture, growth and development, reproduction, and life history. The genetic map of the S. bicolor · S. propinquum RILs contains 141 loci on 10 linkage groups collectively spanning 773.1 cM. Although the genetic map has DNA marker density well-suited to quantitative trait loci mapping and samples most of the genome, our previous observations that sorghum pericentromeric heterochromatin is recalcitrant to recombination is highlighted by the finding that the vast majority of recombination in sorghum is concentrated in small regions of euchromatin that are distal to most chromosomes. The advancement of the RIL population in an environment to which the S. bicolor parent was well adapted (indeed bred for) but the S. propinquum parent was not largely eliminated an allele for short-day flowering that confounded many other traits, for example, permitting us to map new quantitative trait loci for flowering that previously eluded detection. Additional recombination that has accrued in the development of this RIL population also may have improved resolution of apices of heterozygote excess, accounting for their greater abundance in the F5 than the F2 generation. The S. bicolor · S. propinquum RIL population offers advantages over earlygeneration populations that will shed new light on genetic, environmental, and physiological/biochemical factors that regulate plant growth and development.
Research Organization:
US Department. of Agriculture (USDA), Lubbock, TX (United States); University of Georgia, Athens, GA (United States)
Sponsoring Organization:
Government of India; Indian Council of Agricultural Research; U.S. Department of Agriculture (USDA); USDOE
OSTI ID:
1627945
Journal Information:
G3, Journal Name: G3 Journal Issue: 1 Vol. 3; ISSN 2160-1836
Publisher:
Genetics Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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Biofuel and energy crops: high-yield Saccharinae take center stage in the post-genomics era journal June 2013
Genetic analysis of inflorescence and plant height components in sorghum (Panicoidae) and comparative genetics with rice (Oryzoidae) journal April 2015
Sweet sorghum as biofuel feedstock: recent advances and available resources journal June 2017
Genome-wide association mapping of total antioxidant capacity, phenols, tannins, and flavonoids in a panel of Sorghum bicolor and S. bicolor × S. halepense populations using multi-locus models journal December 2019
Sweet sorghum ideotypes: genetic improvement of the biofuel syndrome journal July 2015
Admixture mapping in interspecific Populus hybrids identifies classes of genomic architectures for phytochemical, morphological and growth traits journal June 2019
Construction of a high-density genetic map using specific-locus amplified fragments in sorghum journal January 2017
Quantitative Trait Loci Mapping of Agronomic and Yield Traits in Two Grain Sorghum Biparental Families journal June 2017
Genetic analysis of rhizomatousness and its relationship with vegetative branching of recombinant inbred lines of Sorghum bicolor × S. propinquum journal May 2015