A complete genetic linkage map and QTL analyses for bast fibre quality traits, yield and yield components in jute (corchorus olitorius

Topdar N., Kundu A., Sinha M.K., Sarkar D., Das M., Banerjee S., Kar C.S., Satya P., Balyan H.S., Mahapatra B.S., Gupta P.K

. We report the first complete microsatellite genetic map of jute (Corchorus olitorius L.; 2n = 2x = 14) using an F₆ recombinant inbred population. Of the 403 microsatellite markers screened, 82 were mapped on the seven linkage groups (LGs) that covered a total genetic distance of 799.9 cM, with an average marker interval of 10.7 cM. LG5 had the longest and LG7 the shortest genetic lengths, whereas LG1 had the maximum and LG7 the minimum number of markers. Segregation distortion of microsatellite loci was high (61 %), with the majority of them (76 %) skewed towards the female parent. Genomewide non-parametric single-marker analysis in combination with multiple quantitative trait loci (QTL)-models (MQM) mapping detected 26 definitive QTLs for bast fibre quality, yield and yield-related traits. These were unevenly distributed on six LGs, as colocalized clus-ters, at genomic sectors marked by 15 microsatellite loci. LG1 was the QTL-richest map sector, with the densest co-localized clusters of QTLs governing fibre yield, yield-related traits and tensile strength. Expectedly, favorable QTLs were derived from the desirable parents, except for nearly all of those of fibre fineness, which might be due to the creation of new gene combinations. Our results will be a good starting point for further genome analyses in jute.

Tsitologiya i Genetika 2013, vol. 47, no. 3, pp. 3-13

• Biotechnology Unit, Division of Crop Improvement, Central Research Institute for Jute and Allied Fibres (CRIJAF), Barrackpore, Kolkata 700120, West Bengal, India
• Molecular Biology Laboratory, Department of Genetics and Plant Breeding, Ch. Charan Singh University, Meerut 250004, Uttar Pradesh, India

E-mail: d.sarkar excite.com

Topdar N., Kundu A., Sinha M.K., Sarkar D., Das M., Banerjee S., Kar C.S., Satya P., Balyan H.S., Mahapatra B.S., Gupta P.K A complete genetic linkage map and QTL analyses for bast fibre quality traits, yield and yield components in jute (corchorus olitorius , Tsitol Genet., 2013, vol. 47, no. 3, pp. 3-13.

In "Cytology and Genetics":
N. Topdar, A. Kundu, M. K. Sinha, D. Sarkar, M. Das, S. Banerjee, C. S. Kar, P. Satya, H. S. Balyan, B. S. Mahapatra, P. K. Gupta A complete genetic linkage map and QTL analyses for bast fibre quality traits, yield and yield components in jute (Corchorus olitorius L.), Cytol Genet., 2013, vol. 47, no. 3, pp. 129-137
DOI: 10.3103/S0095452713030092