Differential Effects of Post-Flowering Drought Stress on Growth and Yield of the Basic Generations of Two Common Bean (Phaseolus Vulgaris L.) Populations
Journal Title: STAR Journal - Year 2013, Vol 2, Issue 1
Abstract
Information on the response of basic generations of a population to drought stress may help in designing effective breeding procedure and identification of selection criteria that can be used to develop suitable cultivars. This study was carried out to assess the differential effects of drought stress initiated at flowering stage on the growth, physiological and yield related traits of six basic generations of two common bean populations made of crosses between pairs of drought resistant and susceptible parents (Roba-1 X SER-16; Melka-Dima X SAB623). On average, the stress imposed reduced the various characters examined in the range of 3% (pod length) to 28% (seed yield). Canopy temperature and chlorophyll content, however, increased in response to the stress. When generations of the two populations were compared, those obtained from Melka-Dima X SAB-623 were more sensitive to drought than Roba 1 X SER-16 counterparts. In both crosses, the drought susceptible parents (Roba 1 and Melka-Dima) had the highest drought-induced reduction in growth, stomatal conductance and all yield related traits whereas P1, F1 and BC1 exhibited better performance under drought stress for the different characters studied. Under drought, F1 generation produced higher seed yield than F2 and the two parents, indicating the presence hetrosis under the stress condition. With geometric means of 3722 and 4077, F1 and P1 were found to be the most drought resistant generations in Roba 1 X SER-16 and Melka-Dima X SAB-623 crosses, respectively. Superior performance under drought stress of these generations was associated with the maintenance of higher stomatal conductance, leaf area and aboveground biomass as well as greater ability to remobilize biomass to reproductive sinks (pods and seeds).
Authors and Affiliations
Abebe Hinkossa| Bule Hora University, Post Box No: 144, Bule Hora, Ethiopia, Setegn Gebeyehu| National Bean Research Program, Melkassa Agricultural Research Center, Post Box No: 436, Adama, Ethiopia, Habtamu Zelleke| Haramaya University, Post Box No: 76, Haramaya, Ethiopia
Keywords
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- EP ID EP9502
- DOI http://dx.doi.org/10.4314%2Fstar.v2i1.98839
- Views 396
- Downloads 19
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