Investigation of drought tolerance at seedling stage in forty genotypes of cotton (gossypium hirsutum l.)

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Abstract

In order to examine drought tolerance of cotton genotypes at seedling growth stage, an experiment was conducted in greenhouse using 40 cotton genotypes and three drought levels (-1, -4 and -8 bars) in factorial arrangement with 3 replications and a randomized complete block design. Matric potentials were created based on soil moisture release curve. Percentage emergence, emergence rate, leaf number, leaf area, total dry weight (root and shoot) and root/ shoot ratio were evaluated as affected by metric potentials. Results showed that all traits, except root/ shoot ratio, were decreased with increase in drought stress. Among the measured traits, leaf area was more sensitive and decreased greatly. Drought stress increased root/ shoot ratio, so that the greatest values were obtained at-8 bar. Overall, the genotypes Bulgar 433, Tabeladila and N.O.200 at emergence stage and the genotypes Siokra, Barbadens, Bulgar 433 and Tabeladila at seedling growth stage were the most tolerant, while the genotypes Narabry and Sahel at emergence stage and Narabry, N.O. 259 and Delta pine at seedling growth stage were the most sensive genotypes.

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Seed and Plant Journal
Volume 21, Issue 1
May 2005
Pages 65-79

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