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Effect of drought stress on yield and yield components of some sunflower recombinant inbred lines

Banaei-Asl Farzad, Toorchi Mahmoud, Norouzi Majid, Shakiba Mohamad-reza

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Int. J. Biosci.3(3), 50-56, March 2013

DOI: http://dx.doi.org/10.12692/ijb/3.3.50-56

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Abstract

Nine sunflower inbred lines as listed in (table 3) were chosen for this study. The present work was planned to study effect of drought on yield and yield components of selected inbred lines of sunflower. The information will be important in developing sunflower cultivars tolerant to water stress. The experiment was conducted in a randomized complete block design (RCBD) under split plot arrangement with three replications. The main plots comprised of three treatments i.e. severe water stress, mild water stress and normal irrigation. In the normal condition, plants were watered daily throughout the cropping period, while in the mild and severe stress condition; water stresses was created from R4 and R6 stage, respectively. Highly significant differences observed between stress treatment for Head diameter and stem diameter. While for seed yield and 1000 seed weight exhibited significant differences. Mean squares of different traits under drought and normal irrigation conditions revealed highly significant differences between sunflower inbred lines for all the traits studied. B329, R56 and B147 were less affected under water stress conditions as compared to other lines for seed yield per plant and head diameter. Inbred line B343 for number of seed per plant and inbred line R50 for 1000 seed weight were less affected too. Inbred lines B329 and R56 proved more drought tolerant for stem diameter and plant height. Principle component analyses were done in all three treatments. There were two principle components in each PCA. Thefirst PC (PC1) had high positive correlation with all the traits studied except number of seed per plant. The second (PC2) mostly had high positive correlation with number of seed per plant. The lines B329, R56, B343, R50 and R26 had the least variance in these three treatments. In other word, they were drought tolerant in this experiment but only B329 and R56 had high performance compare with other lines.

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Effect of drought stress on yield and yield components of some sunflower recombinant inbred lines

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