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Rajkumar,University of Agricultural Sciences, Dharwad | Fakrudin B.,University of Agricultural Sciences, Dharwad | Kavil S.P.,University of Agricultural Sciences, Dharwad | Girma Y.,Haramaya University | And 10 more authors.
Physiology and Molecular Biology of Plants | Year: 2013

Root system is a vital part of plants for absorbing soil moisture and nutrients and it influences the drought tolerance. Identification of the genomic regions harbouring quantitative trait loci (QTLs) for root and yield traits, and the linked markers can facilitate sorghum improvement through marker-assisted selection (MAS) besides the deeper understanding of the plant response to drought stress. A population of 184 recombinant inbred lines (RILs), derived from E36-1 × SPV570, along with parents were phenotyped for component traits of yield in field and root traits in an above ground rhizotron. High estimates of heritability and genetic advance for all the root traits and for most of the yield traits, presents high scope for improvement of these traits by simple selection. A linkage map constructed with 104 marker loci comprising 50 EST-SSRs, 34 non-genic nuclear SSRs and 20 SNPs, and QTL analysis was performed using composite interval mapping (CIM) approach. A total of eight and 20 QTLs were mapped for root and yield related traits respectively. The QTLs for root volume, root fresh weight and root dry weight were found co-localized on SBI-04, supported by a positive correlation among these traits. Hence, these traits can be improved using the same linked markers. The lack of overlap between the QTLs of component traits of root and yield suggested that these two sets of parameters are independent in their influence and the possibility of combining these two traits might enhance productivity of sorghum under receding moisture condition. © 2013 Prof. H.S. Srivastava Foundation for Science and Society.

Gejli K.,Main Agricultural Research Station | Shanker Goud I.,Main Agricultural Research Station | Boraiah K.M.,Main Agricultural Research Station
Helia | Year: 2011

The present investigation was undertaken to assess the combining ability for dwarfness among the given testers and also to estimate the extent of heterosis for ten different characters in 90 hybrids which were derived by crossing ten diverse cms lines with nine dwarf testers in a line × tester mating design during rabi 2008-09. The resultant hybrids and parents along with standard check RSFH-130 were evaluated for plant height and other yield contributing traits. CMS-107A among lines and R-411R among testers were found to be best general combiners for dwarfness and other yield contributing traits. The best cross combinations for seed yield per plant CMS-104A × RHA-288 and oil content CMS-131A × R-186-1 with high sca effect have been identified. The cross CMS-105A × R-186-1 recorded a significant heterosis over better parent (-10.65%) for plant height and seed yield and the cross CMS-X × R-4-2-Br recorded a significant heterosis over standard check (-37.30%) for plant height.

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