Abstract
Key message
QTL mapping by two DH mapping populations deciphered allelic variations for five different seed glucosinolate traits in B. juncea.
Abstract
Allelic variations for five different seed glucosinolate (GS) traits, namely % propyl, % butyl, % pentyl, aliphatics and total GS content were studied through QTL analysis using two doubled haploid (DH) mapping populations. While the high GS parents in two populations differed in their profiles of seed aliphatic GS, the low GS parents were similar. Phenotypic data of seed GS traits from three environments of the two populations were subjected to QTL analysis. The first population (referred to as DE population) detected a total of 60 QTL from three environments which upon intra-population meta-QTL analysis were merged to 17 S-QTL (Stable QTL) and 15 E-QTL (Environment QTL). The second population (referred to as VH population) detected 58 QTL from the three environments that were merged to 15S-QTL and 16E-QTL. In both the populations, majority of S-QTL were detected as major QTL. Inter-population meta-analysis identified three C-QTL (consensus QTL) formed by merging major QTL from the two populations. Candidate genes of GS pathway were co-localized to the QTL regions either through genetic mapping or through in silico comparative analysis. Parental allelic variants of QTL or of the co-mapped candidate gene(s) were determined on the basis of the significantly different R 2 values of the component QTL from the two populations which were merged to form C-QTL. The results of the study are significant for marker-assisted transfer of the low GS trait and also for developing lines with lower GS than are present in Brassica juncea.
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Acknowledgments
The study was funded by the National Dairy Development Board (NDDB) and also partly supported by the Department of Biotechnology, Government of India, through the award of a Centre of Excellence on Brassica breeding. K. Rout and M. Sharma acknowledge the receipt of research fellowship from the NDDB and UGC, respectively.
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Communicated by Carlos F. Quiros.
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Rout, K., Sharma, M., Gupta, V. et al. Deciphering allelic variations for seed glucosinolate traits in oilseed mustard (Brassica juncea) using two bi-parental mapping populations. Theor Appl Genet 128, 657–666 (2015). https://doi.org/10.1007/s00122-015-2461-9
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DOI: https://doi.org/10.1007/s00122-015-2461-9