Perera, A.M. (1998) A Study of Waterlogging Tolerance in Short-Duration Pigeonpea(Cajanus Cajan(L.) Millspaugh). PhD thesis, University of Birmingham.
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Abstract
Waterlogging inflicts considerable stress on the pigeonpea crop and causes serious yield losses. The present study investigates the genetical control of phenotypic variation expressed under waterlogged conditions in 6 pigeonpea crosses, produced by crossing tolerant and waterlogging susceptible lines. Altogether 22 traits representing various facets of morphological variability were scored on an individual plant basis and comparisons of the parental and FI means revealed that the additive and dominance effects were present for a large number of these traits in each cross. Heterosis was also observed in one or more crosses for all except two traits (ILN and NTRl), indicating that the FIS perform better than their parents on many occasions. Maximum heterosis was observed for plant height (PHO) and days to lenticel formation (DYL) where 5 of the 6 crosses showed heterosis. However, heterosis was significant on only 5 occasions, in crosses 2 and 4 for DYL and in cross 6 for PH3, PH4 and NFL. Analysis of the parental, F1, Fz, F3, Bcl,]a nd BC,.g~en erations further indicated that the genetical control of various traits is very complex indeed. Epistasis was detected for 86 (out of 126) cross/trait combinations and there was no trait for which epistasis was absent in all 6 crosses. Predominantly duplicate epistasis is prevailing in these crosses, suggesting that there will be better prospects of extracting superior inbred lines and only a marginal advantage in breeding hybrid varieties. In general, crosses between tolerant and susceptible lines show higher variation than those produced from tolerant lines and the former crosses are more suitable for further breeding. Finally, there is no apparent association between plant Vigour and tolerance to waterlogging. Therefore, plant vigour does not seem to be directly involved in determining tolerance to waterlogging in pigeonpea.
| Item Type: | Thesis (PhD) |
|---|---|
| Author Affiliation: | The University of Birmingham, United Kingdom. |
| Subjects: | Plant Protection Statistics and Experimentation Plant Physiology and Biochemistry > Plant Physiology |
| Divisions: | Pigeonpea |
| Depositing User: | Mr Balakrishna Garadasu |
| Date Deposited: | 28 Jul 2013 11:00 |
| Last Modified: | 28 Jul 2013 11:00 |
| URI: | http://eprints.icrisat.ac.in/id/eprint/11252 |
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