A major QTL for plant height is linked with bloom locus in sorghum [Sorghum bicolor (L.) Moench]

Title 
A major QTL for plant height is linked with bloom locus in sorghum [Sorghum bicolor (L.) Moench] 
Publication Type 
Journal Article 
Authors 
Madhusudhana R, Patil JV 
Year of Publication 
2013 
Volume 
191 
Journal 
Euphytica 
Issue 
Pagination 
259 - 268 
Date Published 
5/2013 
ISSN 
1573-5060 
URL 
http://link.springer.com/article/10.1007/s10681-012-0812-z 
Keywords 
Bloom trait, Dwarfing genes, Plant height, Sorghum 
DOI 
10.1007/s10681-012-0812-z 
Abstract 

Plant height is one of the most important agronomic traits in sorghum with its relevance for biomass, grain yield, fodder and lodging. To understand its genetic basis, the quantitative trait loci (QTL) were identified using a recombinant inbred line (RIL) population consisting of 168 RILs derived from the cross between the two sorghum inbred lines 296B (dwarf) and IS18551 (tall) over six seasons. Two major QTL were identified one each on chromosomes SBI-06 and SBI-07 corresponding to the Dw2 and Dw3 gene loci together accounting 41 % plant height variation. In addition, a morphological bloom trait locus which remained unlinked in the linkage map was found to be significantly linked with plant height in single marker analysis explaining 22 % of the trait variation. By comparing the map positions of Dw1, Dw2 and Dw3, the new locus for plant height linked with bloom is proposed as Dw4 locus. Both SSR and the morphological bloom loci linked with height QTL of the present study can be employed as effective tools in marker-assisted breeding for rapid conversion of selected inbred parent lines either as dwarf seed (male sterile) parents or taller pollinators for hybrid seed industry, or for developing high biomass lines in sweet sorghum for exploitation as high bio-fuel crop.

 
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