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Rasht Branch, Islamic Azad University
Abstract:   (24 Views)

In order to evaluate the effect of drought stress and determination of effective traits on grain yield and estimation of genetic parameters 18 mutant rice lines were studied in normal and drought stress conditions. The experiments were carried out separately using randomized complete block design with three replications during cropping season 2014-2015 at Iranian Rice Research Centers in North of Iran, Rasht. High values of heritability, genetic advances and genetic variances was observed for plant height, tiller number, filled grain number and unfilled grain number in both conditions and grain productivity and grain yield in drought stress condition. This indicated the additive effect of genes in controlling of these traits and therefore these traits can be improved with selection in breeding programes. There were positive correlations between grain yield and tiller number, panicle exsertion, grain productivity and width and length of flagh leaf in normal irrigation condition. Grain yield had also positive correlation with flagh leaf width, panicle exsertion, filled grain number, grain productivity and width and length of grain in drought stress condition. Regression and path analyses indicated positive effects of grain width, grain productivity, flagh leaf width, filled grain number, tiller number and internode length in normal irrigated condition and grain productivity, grain width and tiller number in drought stress condition. Therefore it is possible improvement of grain yield with these variables. The genotypes including G1, G2, G3and G4 had the highest values of grain yield (2788, 2163, 2178 and 2194 kg ha-1) in drought stress condition, and influencing traits on grain yield. Due to the stress index (SI) these genotypes were also as drouht tolerant and so can be used for drought tolerance cultivar introduction.

Type of Study: Research | Subject: Special

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