Sunflower (Helianthus annuus L.) is one of the world’s major oilseeds species
however, it faces the problem of summer drought which coincides with the end of
its cycle inducing yield decrease. The aim of this study is to identify
morpho-physiological traits that can be used as selection criteria in
hybridization programs for stress tolerance. In this context, a greenhouse
essay has been carried out using five oleic sunflower genotypes arranged in a
randomized complete block design with two water regimes; water regime 2:100% of
field capacity and water regime 1:30% of field capacity. The obtained results
show that water stress affects many measured parameters such as relative water
content, stomatal conductance, stem diameter and yield components (seed number
per head and 100-seed weigh). Genotype effect was significant for stomatal
conductance, number of leaves per plant and yield components. However, the
effect of the genotype x water regime interaction was significant only for the
number of leaves per plant, yield and seed number per head.
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