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Construction of Genetic Linkage Map and QTL Analysis of Sink-Size Traits in Pearl Millet (Pennisetum glaucum)

OAR@ICRISAT

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Relation http://oar.icrisat.org/7365/
http://dx.doi.org/10.5402/2013/471632
 
Title Construction of Genetic Linkage Map and QTL Analysis of Sink-Size Traits in Pearl Millet (Pennisetum glaucum)
 
Creator Vengadessan, V
Rai, K N
Bapu, J R K
Hash, C T
Bhattacharjee, R
Senthilvel, S
Vinayan, M T
Nepolean, T
 
Subject Millets
Genetics and Genomics
 
Description A linkage map, primarily based on SSCP-SNP markers, was constructed using 188 F2:3 mapping population progenies produced from a cross between two pearl millet inbred lines having diverse parentage. The skeleton linkage map covered 1019 cM and it comprised of 44 markers distributed across the seven linkage groups. Average adjacent-marker intervals ranged from 14 cM on LG1 to 38 cM on LG6, with an overall mean of 23 cM. Using the F2 linkage map and phenotypic data from the F2 and F2:3 generations of the mapping population, a total of 18 putative QTLs were detected for the three sink-size components. Eight QTLs explained 42.7% of observed phenotypic variation for panicle length using the F2:3 data set. For panicle diameter, 5 QTLs explained 45.8% of observed phenotypic variation. Similarly for grain size, 5 QTLs explained 29.6% of phenotypic variation. Genomic regions associated with panicle length, panicle diameter, and grain size were comapped on LG6 between Xpsms88 and Xpsms2270, indicating the existence of a gene or gene cluster. The QTLs for panicle length on LG2 and LG6 ( in both F2 and F2:3 data sets), for panicle diameter on LG2 and LG3 ( in the F2:3 data set), and for grain size on LG3 and LG6 ( in both F2 and F2:3 data sets) were identified as promising candidates for validation prior to possible application in marker-assisted breeding.
 
Publisher Hindawi Publishing Corporation
 
Date 2013
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/7365/1/ISRNGenetics_Construction_1-14_2013.pdf
Vengadessan, V and Rai, K N and Bapu, J R K and Hash, C T and Bhattacharjee, R and Senthilvel, S and Vinayan, M T and Nepolean, T (2013) Construction of Genetic Linkage Map and QTL Analysis of Sink-Size Traits in Pearl Millet (Pennisetum glaucum). ISRN Genetics, 2013. pp. 1-14. ISSN 2090-8687