Bijiga, G
(1987)
Relationships among the F2 to F6 generations, and effect of spacing and selection in F4 on performance in F5 generation in chickpea.
PHD thesis, Andhra Pradesh Agricultural University.
Supervisors
| Supervisors Name | Supervisors ID |
|---|
| Jagdish, C A | APAU |
| van Rheenen, H A | ICRISAT |
| Singh, Onkar | ICRISAT |
| Singh, Murari | ICRISAT |
Abstract
Two experiments were conducted 1. to determine the
relationships among the F2 to F6 generations; and 2, to study the effect of spacing and selection in the F4 on the performance of F5 progenies of chickpea.The results showed that the F2 yield had a significant and positive correlation with the F3. This indicates that under this experimental conditions early generation yield testing at the F2 could have been used as a reliable predictor of the performances of the crosses at the F3 generation. Hence elimination of the poor yielding crosses can be achieved at the F2 to concentrate the efforts on the high yielding crosses at later generations. The mean yields of the F2 or F3 had no significant correlation with F4, F5 and F6 generations. Correlations obtained among the F2 to F6 generations for all the characters studied showed significant positive associations among the F2 to F6 generations for days to 50% flowering, maturity and seed weight. This shows that prediction for these characters can be made from the F2 or F3 generation. Correlations for other characters like plant height, primary and secondary branches, number of pods per plant, number of seeds per plant and seed yield per plant were not significantant indicating that these characters are not stable from generation to generation even under the same environment. Correlation studies between yield and yield components separately in F2, F3, F4, F5 and F6 revealed that all the characters studied except days to 50% flowering and maturity had significant positive associations with seed yield per plant. The correlation values between these characters and seed yield per plant increased with advanced generations up to F5 and then stablized. Spacing had a significant effect on selection in F4 as measured by the performance of the progenies in the F5 generation. Selection from wide spacing gave advantages of 0-208 and 9-288 over random selection and selection from close spacing.
Correlation studies between yield and other characters in
different spacings exhibited that yield per plant had a positive association with all the characters except for days to 50% flowering and maturity. Among these characters 20-seed weight had only significant association with seed yield per plot in F5 generations. The path coefficient analysis showed that seed weight had the maximum direct contribution to the yield per plot. Therefore, seed weight could be used as selection criterion in F4 to predict the performance of the F5 progenies. Selection from wide spacing (60cm x 20cm) would be more efficient in chickpea improvement than selection from crop spacing (30cm x 10cm)
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