Results of a physiological selection approach to improve drought resistance in sunflower
1997
Baldini, M. | Vannozzi, G.P. | Gomez-Sanchez, D. (Udine Univ. (Italy). Crop Production Dept.) | Turi, M.
Carbon exchange rate, transpiration rate and relative water content of leaves were used as selection criteria to improve the drought resistance in a population coming from a cross between the wild species Helianthus argophyllus and inbred line C of cultivated sunflower. In the F3 and under drought conditions, other traits related to growth and yield were evaluated. The observed variability showed that selection for physiological traits was possible. Divergent selection in the F2 population, evaluated physiological activity under drought resulted in genotypes with a high vegetative growth and with an elevated water consumption. This was paralelled by an increase of root/shoot index. Stress was avoided by continued water uptake from deeper soil layers.
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