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Evaluation of drought tolerance in sunflower (Helianthus annus L.) under non stress and drought stress conditions

Research Paper | January 1, 2015

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Seyed Mehdi Safavi, Azam Sadat Safavi, Seyed Afshin Safavi

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J. Bio. Env. Sci.6( 1), 580-586, January 2015


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To evaluate some of agronomic and physiological characteristics under drought stress, determining the best quantitative indices for drought resistance, and identifying drought resistant of sunflower lines, field experiment with 36 sunflower genotypes was carried out in 2010 at the research farm of Dryland Agricultural Research Institute (Sararood). 36 lines of sunflower were tested in a 6´6 lattice design with two replications under two different water conditions at flowering and seed development stages. Some of agronomic and physiological characteristics under drought stress were measured during the growing season. Based on the results of correlation between drought indices with seed yield in stress and non-water stress environment, MP, GMP, Harm and STI exhibited a high correlation with seed yield in either environment. These indices were recognized as the best for selecting cultivars with high yield potential in either of the stress of non-stress environments. The genotype SIL-237 had the highest drought resistance based on Harm, GMP, MP and STI. The genotype SIL-237 revealed the highest yield in non stress and stress condition. Cluster analysis grouped the 36 genotypes within 3 clusters, each of which having 17, 18 and 1 genotypes.


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