Comparison of selection from F2 and F3-generation for yield improvement in mungbean
1990
Peerasak Srinives | Olarn Meesang | Rachain Thiraporn | Narong Singburaudom (Kasetsart Univ., Bangkok (Thailand). Kamphaeng Saen Campus. Faculty of Agriculture. Dept. of Agronomy)
Pedigree selection, beginning from F2 and F3 generations of mungbean, was practiced based on 1,000 seed weight from rainy season of 1986. The selected F7 and F8 lines were tested in the dry season of 1989. There was no variation in yield and yield components between F7 and F8 line groups. Variation between lines within group was high in these characters, except for number of pods per plant in the F8-line group. The variation between selected lines was due mainly to the difference between lines of the crosses rather than the starting generations. However, the starting generations might affect selection of some particular crosses. Consequently, the final selected lines may express variation in some traits due to the selected crosses. The selected F7-lines were shorter in plant height and days to maturity as compared to the F8-lines. The results also suggested that selection in mungbean lines of similar genotypes should be practiced beginning in the F2-generation to save the cost of labour, land and others by discarding a number of lines in earlier generations. This can be done without error from genetic instability of the F2-genotypes or segregation in the succeeding generations. Correlation study using the dry season data indicated positive association between yield and all major yield components, namely 1,000 seed weight, number of seeds per pod and number of pods per plant. Thus these characters should be considered together in selection for high yielding mungbean lines.
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