QTL mapping of stay-green in two sorghum recombinant inbred populations

The stay-green trait is a reported component of tolerance to terminal drought stress in sorghum. To map quantitative trait loci (QTLs) for stay-green, two sorghum recombinant inbred populations (RIPs) of 226 F(3:5) lines each were developed from crosses (1) IS9830 x E36-1 and (2) N13 x E36-1. The co...

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Published in:Theoretical and applied genetics 2002-12, Vol.106 (1), p.133-142
Main Authors: HAUSSMANN, B. I. G, MAHALAKSHMI, V, REDDY, B. V. S, SEETHARAMA, N, HASH, C. T, GEIGER, H. H
Format: Article
Language:English
Subjects:
Agricultural production
Biological and medical sciences
Chromosome Mapping
Classical genetics, quantitative genetics, hybrids
Crop residues
Dehydration - genetics
Dehydration - metabolism
Edible Grain - genetics
Edible Grain - metabolism
Fundamental and applied biological sciences. Psychology
Genetic aspects
Genetics of eukaryotes. Biological and molecular evolution
Identification and classification
Marker assisted selection
Plant genetics
Plants, Genetically Modified
Pteridophyta, spermatophyta
Quantitative Trait Loci
Seasons
Seeds
Sorghum
Vegetals
Water - metabolism
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Summary:The stay-green trait is a reported component of tolerance to terminal drought stress in sorghum. To map quantitative trait loci (QTLs) for stay-green, two sorghum recombinant inbred populations (RIPs) of 226 F(3:5) lines each were developed from crosses (1) IS9830 x E36-1 and (2) N13 x E36-1. The common parental line, E36-1 of Ethiopian origin, was the stay-green trait source. The genetic map of RIP 1 had a total length of 1,291 cM, with 128 markers (AFLPs, RFLPs, SSRs and RAPDs) distributed over ten linkage groups. The map of RIP 2 spanned 1,438 cM and contained 146 markers in 12 linkage groups. The two RIPs were evaluated during post-rainy seasons at Patancheru, India, in 1999/2000 (RIP 2) and 2000/2001 (RIP 1). The measures of stay-green mapped were the green leaf area percentages at 15, 30 and 45 days after flowering (% GL15, % GL30 and % GL45, respectively). Estimated repeatabilities for % GL15, % GL30 and % GL45 amounted to 0.89, 0.81 and 0.78 in RIP 1, and 0.91, 0.88 and 0.85 in RIP 2, respectively. The number of QTLs for the three traits detected by composite interval mapping ranged from 5 to 8, explaining 31% to 42% of the genetic variance. In both RIPs, both parent lines contributed stay-green alleles. Across the three measures of the stay-green trait, three QTLs on linkage groups A, E and G were common to both RIPs, with the stay-green alleles originating from E36-1. These QTLs were therefore consistent across the tested genetic backgrounds and years. After QTL validation across sites and verification of the general benefit of the stay-green trait for grain yield performance and stability in the target areas, the corresponding chromosomal regions could be candidates for marker-assisted transfer of stay-green into elite materials.
ISSN:0040-5752
1432-2242
DOI:10.1007/s00122-002-1012-3