Identification of drought selection indices of common bean (Phaseolus vulgaris L.) genotypes in the Southern Highlands of Tanzania
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Date
2019-12-05
Journal Title
Journal ISSN
Volume Title
Publisher
African Journal of Agricultural Research
Abstract
A study was conducted to evaluate common bean (Phaseolus vulgaris L.) genotypes for drought
tolerance in the Southern Highlands of Tanzania. Treatments included 18 genotypes laid out in a 3×18
split plot arranged in randomized complete block design with three replications. The data on yield
under water stress and non-water stress treatments were used to calculate indices that can be used for
predicting tolerant genotypes. This was accomplished by ranking the yield indices within the selection
indices. Results showed that, selection index, YI, identified BFS60, KG104-72 and SER16 as the most
tolerant genotypes, while STI, MP and GM identified SER16, BFS60 and KG104-72. Another index, SSPI,
identified RCB266, 41-EX-VAM and SER83 as most sensitive genotypes to water deficit while HM
showed BFS60, SER16 and KG104-72 as genotypes tolerant to drought. In contrast, SSI discriminated
41-EX-VAM, RCB266 and PASS as most susceptible genotypes under drought. Ranking the means of
yield indices, genotypes SER16, BFS60 and KG104-72 were identified as the most drought tolerant
genotypes. Correlation analysis showed that Yp were highly significant (p < 0.001) and positively
correlated with STI, SSPI, MP, HM, and GM while Ys were highly significant (p<0.001) and positively
correlated with YI, STI, MP, HM and GM. The findings suggest that these indices are effective for
discriminating genotypes with higher yields under non stress and stress conditions, respectively.
Genotypes, SER16, BFS60 and KG104-72 are among the most tolerant to drought conditions therefore
are recommended for cultivation in drought prone environments and subsequently as parental
materials in breeding for drought tolerance.
Description
Full Length Research Paper
Keywords
Common bean, Drought, Selection indices, Yield indices ranks
Citation
http://www.academicjournals.org/AJAR