Manga , V. and Pantulu, J.V. (1974) Chiasma frequency in homozygotes and heterozygotes of pearl millet. Proceedings: Plant Sciences , 80 (3). pp. 105-120.
![[img]](http://eprints.icrisat.ac.in/style/images/fileicons/application_pdf.png) |
PDF
- Published Version
Restricted to ICRISAT researchers only |
Abstract
Four inbreds of pearl millet and their F1 hybrids, obtained by crossing the inbreds in all possible combinations, were grown in two seasons—the stress season and the non-stress season—to study whether there are any differences in the genotype environment interactions between the inbreds and their F1 hybrids. The mean chiasma frequency of the inbreds was lower and the variation of the mean chiasma frequency was more in the stress conditions than in the non-stress conditions. In both seasons the heterozygotes showed limited variation among their means, and larger mean chiasma frequencies when compared to the inbreds. The differences between the inbreds in their interaction with the seasons were significant. Different hybrids interacted with the seasons in a significantly different manner from each other. However, the differences between the inbreds as a group and hybrids as a group interacted with the environment in a large measure. When examined with the means, the significant differences between hybrids and inbreds in their interaction with the seasons showed that the hybrids were relatively stable over seasons as compared to the inbreds. The intercell variation within each plant was also examined as a variable to detect differences if any between genotypes, particularly to find out if the hybrids have a different type of variation as compared to the inbreds. The analysis revealed that the inbreds as a group are having larger means for this variable over hybrids. The hybrids have much less intercell variation within individual plants and nearly twice the buffering capacity of the inbreds. The hybrids and inbreds interacted similarly to the environment for the intercell variation. Diallel analysis carried out to study the genetic nature of heterosis for chiasma frequency revealed average overdominance for this character and the overdominance was shown to be at least partly due to non-allelic gene action.
| Item Type: | Article |
|---|---|
| Author Affiliation: | Department of Botany, Andhra University, Waltair, India |
| Subjects: | Crop Improvement |
| Divisions: | Millet |
| Depositing User: | Library ICRISAT-InfoSAT |
| Date Deposited: | 06 Mar 2012 06:31 |
| Last Modified: | 06 Mar 2012 06:31 |
| Official URL: | http://dx.doi.org/10.1007/BF03052369 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/3487 |
Actions (login required)
 |
View Item |
