Determination of most effective traits on rice yield under normal and drought conditions
Subject Areas : biologymohammadreza karim 1 , hossein sabouri 2 , mohammadali ebrahimi 3 , Somayyeh Sanchouli 4
1 - MS student in Agricultural Biotechnology
2 - Gonbad Kavous University, Iran
3 - 3. Professor, Department of Biotechnology, Payame Noor University, Tehran
4 - Gonbad Kavous Univeristy
Keywords: Cluster analysis, Path analysis, Drought stress, Rice, Morphological,
Abstract :
In order to evaluate the effect of drought stress on yield and the other related traits, 14 rice genotypes (including five varieties of landrace and introduced varieties) in a randomized complete block design with three replications in two environments without stress (flooding) and drought stress in the field Research located in Aliabad (under the supervision of Gonbad Kavous University) was studied. Irrigation of experimental farm in both the flood and drought were flooded until maximum tillering stage. Irrigation was performed every 25 days until the end of the season from 40 days after maximum Tillerin). Analysis of variance showed significant differences among genotypes for all traits in both conditions. The average yield of the genotypes in the normal and stress conditions lR83752-BB-12-3 and was Sepedroud. Panicle weight (0.85**) under stress (flooding) and root volume (0.98**) in drought stress conditions, the highest positive correlation with grain yield were Significant. Path analysis results showed that different traits were involved in justifying grain yield under non-stress and drought stress conditions, so that in non-stress condition, number of panicle and in drought condition, number of filled grain per panicle had the highest direct and positive effect on grain yield. In grouping cultivars based on cluster analysis using ward method, cultivars were divided into three groups under normal conditions and stress. The results of cluster analysis showed that Pegaso, IR83752-B-B-12-3 and Sepidrood cultivars, which had more volume, fresh weight and root dry weight than other cultivars, were in the drought tolerant group.
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