Relationships between hard-seededness and seed weight in mungbean (Vigna radiata) assessed by QTL analysis

M.E. Humphry, C.J. Lambrides, S.C. Chapman, E.A.B. Aitken, B.C. Imrie, R.J. Lawn, C.L. Mcintyre, Chunji Liu

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    Abstract

    Weather damage reduces the value of commercial mungbean, but hard-seededness can reduce the level of damage. However, attempts to breed large- and hard-seeded mungbean varieties have been unsuccessful. To understand the relationship between seed weight and hard-seededness, these traits were investigated using a quantitative trait loci (QTL) mapping approach with a recombinant inbred population derived from a cross between a completely soft-seeded variety and a completely hard-seeded genotype. The two parental genotypes also had a sixfold difference in seed weight. QTL analyses revealed four loci for hard-seededness and I I loci for seed weight. Two of the hardseededness loci co-localized with seed weight QTL. When seed weight was used as a covariate in the analysis of hard-seededness from the field data, two of the four hard-seeded QTL remained significant with the effect at one of these remaining unchanged. These results explain why retaining hard-seededness in large seeded mungbean lines has been unsuccessful. The existence of a persistent locus, however, indicated that breeding large and persistently hard-seeded varieties of mungbean may be possible.
    Original languageEnglish
    Pages (from-to)292-298
    JournalPlant Breeding
    Volume124
    Issue number3
    DOIs
    Publication statusPublished - 2005

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    Humphry, M. E., Lambrides, C. J., Chapman, S. C., Aitken, E. A. B., Imrie, B. C., Lawn, R. J., ... Liu, C. (2005). Relationships between hard-seededness and seed weight in mungbean (Vigna radiata) assessed by QTL analysis. Plant Breeding, 124(3), 292-298. https://doi.org/10.1111/j.1439-0523.2005.01084.x