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, 105 (1), 160-166

Development of a Mungbean ( Vigna Radiata) RFLP Linkage Map and Its Comparison With Lablab ( Lablab Purpureus) Reveals a High Level of Colinearity Between the Two Genomes

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Development of a Mungbean ( Vigna Radiata) RFLP Linkage Map and Its Comparison With Lablab ( Lablab Purpureus) Reveals a High Level of Colinearity Between the Two Genomes

E. Humphry et al. Theor Appl Genet.

Abstract

A genetic linkage map of mungbean ( Vigna radiata, 2n = 2 x = 22) consisting of 255 RFLP loci was developed using a recombinant inbred population of 80 individuals. The population was derived from an inter-subspecific cross between the cultivated mungbean variety 'Berken' and a wild mungbean genotype 'ACC 41' ( V. radiata subsp. sublobata). The total length of the map, which comprised 13 linkage groups, spanned 737.9 cM with an average distance between markers of 3.0 cM and a maximum distance between linked markers of 15.4 cM. The mungbean map was compared to a previously published map of lablab ( Lablab purpureus, 2n = 2 x = 24) using a common set of 65 RFLP probes. In contrast to some other comparative mapping studies among members of the Fabaceae, where a high level of chromosomal rearrangement has been observed, marker order between mungbean and lablab was found to be highly conserved. However, the two genomes have apparently accumulated a large number of duplications/deletions after they diverged.

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