QTL identification for molecular breeding of fibre yield and fibre quality traits in jute |
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Authors: | Moumita Das Sumana Banerjee Niladri Topdar Avijit Kundu Reyazul Rouf Mir Debabrata Sarkar Mohit K. Sinha Harindra S. Balyan Pushpendra K. Gupta |
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Affiliation: | 1.Molecular Biology Laboratory, Department of Genetics and Plant Breeding,Ch. Charan Singh University,Meerut,India;2.Biotechnology Unit, Division of Crop Improvement,Central Research Institute for Jute and Allied Fibres (ICAR),Barrackpore,India;3.The Centre of Excellence in Genomics (CEG), International Crops Research, Institute for the Semi-Arid Tropics (ICRISAT),Greater Hyderabad,India |
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Abstract: | In jute (Corchorus olitorius), quantitative trait loci (QTL) analysis was conducted to study the genetics of eight fibre yield traits and two fibre quality traits. For this purpose, we used a mapping population consisting of 120 recombinant inbred lines (RILs) and also used a linkage map consisting of 36 SSR markers that was developed by us earlier (Das et al. 2011). The RIL population was derived from the cross JRO 524 (coarse fibre) × PPO4 (fine fibre) following single seed descent. Using single-locus analysis involving composite interval mapping, a total of 21 QTLs were identified for eight fibre yield traits whereas for fibre quality (fibre fineness), only one QTL was detected. The QTL for fibre fineness explained 8.31–10.56% of the phenotypic variation and was detected in two out of three environments. Using two-locus analysis involving QTLNetwork, as many as 11 M-QTLs were identified for seven fibre yield traits (excluding top diameter) and one M-QTL was identified for fibre fineness which accounted for 4.57% of the phenotypic variation. For six fibre yield traits, we detected 16 E-QTLs involved in nine QQ epistatic interactions. For fibre fineness, four E-QTLs involved in two QQ epistatic interactions and for fibre strength, six E-QTLs involved in three QQ epistatic interactions were identified. Eight out of the 11 M-QTLs observed for the fibre yield traits were also involved in QE interactions; for fibre fineness and fibre strength, no QE interactions were observed. |
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