Reddy, B.V.S. and Prasad Rao, N.G. (1971) Genetic Analysis of some Exotic × Indian Crosses in Sorghum V. Character Association and Response to Selection in Advanced Generation Progenies. Indian Journal of Genetics and Plant Breeding, 31 (3). pp. 510-520.
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Abstract
Yield performance and nature of character association in a sample of F4 and F5 segregates derived from some exotic × Indian cross combinations of sorghum were studied in relation to the parents involved and the corresponding F1 hybrids. The F1 hybrids represented some of the high yielding exotic × Indian combinations. The segregating families were not the most superior lines available, but represented a range of variation for height, maturity and yield between the parental extremes. 1. The family means are generally superior to the dwarf, exotic parents and sometimes to the mid parental values as well as high parents, but they were not generally superior to the corresponding F1 hybrids. There was transgression of parental limits but not transgression of the F1 with the exception of panicle length in most families and secondary branches in a few crosses. The differences within a family were also significant indicating that sufficient homozygosity and homogeneity were not attained and that further response to selection is feasible. The superior progenies generally tended towards lateness and tallness. 2. Phenotypic and genotypic correlations based pn parents, F5 segregates and a combination of parents and F6 offspring clearly established the positive relationships between flowering and yield, plant height and yield, flowering and plant height, and yield and secondary branches of the panicle. The correlation coefficients based on F5 generation are particularly significant since the association was maintained after five generations of selection. 3. Partitioning of the correlation coefficients through path analysis indicated that in the parental group both direct and indirect effects of plant height and flowering were pronounced. On the other hand in the F5 progenies, while the direct effects are pronounced, the indirect effects of flowering and height were dissipated. The indirect effect of other components like grain weight assumed greater importance. 4. Studies on correlated response further revealed the interrelationships of flowering, plant height, yield and secondary branches which appear to be the most important components of fitness. 5. Evaluation of various selection schemes revealed that selection for flowering and height were more effective than selecting for yield itself. Selection based on yield, flowering and plant height was as effective as selection based on all the six components under study.
| Item Type: | Article |
|---|---|
| Author Affiliation: | All India Coordinated Sorghum. Improvement Project, I.A.R.I. Regional Research Station, Hyderabad, 30, A.P. |
| Subjects: | Plant Production Crop Improvement |
| Divisions: | Sorghum |
| Depositing User: | Mr. SanatKumar Behera |
| Date Deposited: | 30 May 2012 10:09 |
| Last Modified: | 30 May 2012 10:09 |
| Official URL: | http://www.indianjournals.com/ijor.aspx?target=ijo... |
| URI: | http://eprints.icrisat.ac.in/id/eprint/5952 |
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