Breeding behavior of Vigna radiata - Vigna mungo hybrid progenies for crop improvement in mungbean

Breeding behavior of Vigna radiata - Vigna mungo hybrid progenies for crop improvement in mungbean

Shanhua, Tainan AVRDC Taiwan

1988

p.187-199

SB205.M8A5 1987

Interspecific crosses between V. radiata x V. mungo were obtained. In F2 the percentage of aborted seed, incidence of plant death and sterile plants were high but gradually reduced from F2 to F4. Wide variation was evident in F2 in plant height, number of branches, clusters and pods, pod length and seeds/pod. Seventy-nine percent of the F2, 24% of the F3 and 20% of the F4 segregants showed more black gram traits. Based on yield of the F11 to F13 generations, four progenies, CoGB.2, CoGB.10, CoGB.11 and CoGB.17 were identified as stable genotypes and were carried over to the advanced yield trials. V. radiata and V. mungo can be regarded as highly-compatible species with gross genome homology. Hybrid sterility and breakdown largely work as isolation mechanisms. There is, however, evidence of a prefertilization barrier. The recombination of useful traits from both species is possible through interspecific hybridization. The characters that could be transferred from black gram to mungbean are large seed size, better capacity, high harvest index and resistance to bruchids and mungbean yellow mosaic virus. The interspecific derivatives offer scope for selection for high grain yield. Results of the isozyme variability existing between and within the species and in the F2 of the cross V. radiata x V. mungo are also reported. Interspecific crosses between Vigna species Vigna radiata var. sublobata and V, trilobata were studied at Tamil Nadu Agricultural University. It was found that the 100-seed weight of the species of Vigna could be doubled. The study suggests that success of the interspecific cross can be increased by using many different genotypes rather than by crossing extensively one or two selected specific cultivars. [AS]

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