Food legume breeding: improving yield, quality and usefulness of lentils and lablab beans [Bangladesh]
1990
Newaz, M.A. | Newaz, N. | Farooque, M.A.
The results of 1988/89 experimentations which included five experiments on lentil and three experiments on lablab bean (or country bean) are reported. Under germplasm trials 650 lentil and 146 lablab bean lines of local and exotic origins were evaluated and characterized. In lentil, phenological studies with six sowing dates during Nov.-Dec. affirmed a genetic variation of tolerance to late sowing effect. Genotype-weeding interaction studies suggested that lentil genotypes could linearly profit from weeding in terms of yield and G X W interaction was weakly expressed in one character, pods/plant only. Selection trials with early, high yielding and bold seeded lentil genotypes showed bold seeded or macrosperm types were generally poor yielding and late maturing. Seed protein content ranged from 24.3% to 27.2% among ten lentil genotypes studied in a yield trial. Yield data was not conclusive as the trial was affected by unfavourable weather. Results of lablab bean studies with two sowing dates-mid May and mid July, illustrated that off-season early sowing (as in May) of local genotypes did not enhance flowering appreciably nor give any pod yield benefits; in two genotypes pod production was rather depressed with excessive vegetative growth when sowing was ahead of season. Flowering behaviour was periodically fixed in two exotic genotypes unlike the local beans. The genetic studies using filial and back-crossed progenies of a bean cross between local and exotic genotypes indicated greater role of additive gene action for flowering and pod yield while for protein content both additive and dominance genetic components were equally important.
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