Vol. 85 No: 5

Title:
Quantitative trait loci for photosynthetic pigment concentration in a doubled-haploid population of Pak Choi (Brassica rapa ssp. chinensis var. communis Tsen et Lee)

Authors:
Q. WANG, X.L. HOU, J.F. GENG, Y. CHENG, Q.Y. BAN, J.W. ZOU and G.C. BARKER

pp: 421-426

Abstract:
Quantitative trait loci (QTL) mapping and marker development are essential steps in any molecular breeding programme. In this study, QTL for photosynthetic pigment concentration were identified using a doubled-haploid (DH) population of 112 lines derived from an F1 hybrid of Pak Choi, ‘Shulv’, obtained from a cross between Brassica rapa lines SW-13 and SU-124 through microspore culture. QTL mapping was carried out using a modification to the map of ‘Shulv’. Alignment of the linkage groups was carried out with those of reference B. rapa maps, allowing the assignment of these groups as A01 – A10. In total, 11 QTL were associated with photosynthetic pigment concentration and identified on linkage groups A05, A08, and A10.The maximum phenotypic variance for a single QTL was 38.0%. Markers closely linked to these QTL could assist in the development of Pak Choi cultivars with increased yield, due to having improved photosynthetic capabilities.

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