Evaluation of physiological parameters as a screening technique for drought tolerance in bread wheat

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Research Paper 01/03/2014
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Evaluation of physiological parameters as a screening technique for drought tolerance in bread wheat

Ezatollah Farshadfar, Meysam Ghasemi, Fariba Rafii
J. Bio. Env. Sci.4( 3), 175-186, March 2014.
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In the present study, we evaluated the ability of yield based and physiological parameters for identification of drought tolerant bread wheat genotypes. The experiment was conducted in a randomized completely block design (RCBD) with three replications under two different rainfed and irrigated conditions. The results of analysis of variance exhibited significant differences between the genotypes for grain yield (GY), cell membrane stability (CMS), proline concentration (PC), relative water content (RWC), chlorophyll fluorescence (CHF), stomatal conductance (SC), relative chlorophyll content (RCC) , excised leaf water retention (ELWR) and relative water loss (RWL) indicating the presence of genetic variation and possible screening of drought tolerant genotypes. Significant correlation was found between multiple selection index (MSI) and stress tolerance index (STI). Screening drought tolerant genotypes by physiological indicators of drought tolerance using mean rank, standard deviation of ranks and biplot analysis, discriminated genotypes (18), (15), (10), (5) and (2) as the most drought tolerant. Therefore they are recommended to be used as parents for genetic analysis, gene mapping and improvement of drought tolerance in common wheat.


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