Response of five sunflower genotypes (Helianthus annuus L.) to different concentrations of sodium chloride
1999
El-Midaoui, M. (Ecole Nationale d'Agriculture, Meknes (Morocco)) | Talouizte, A. | Benbella, M. | Serieys, H. | Berville, A.
Present study was carried out to identify morphological and physiological parameters that might be involved in adaptation of sunflower to salt conditions. Five sunflower genotypes (Oro 9, Mirasol, Flamme, Pinto and Ludo) were submitted, under greenhouse conditions, to four NaCl concentrations (0, 50, 75 and 100 mM). Results showed that increasing NaCl concentrations in the medium significantly reduced all morphological parameters of genotypes. Chlorophyll content declined drastically at 100 mM NaCl (-61.67%). Amino acids content of both leaves and roots of stressed plants increased as NaCl concentrations in the medium was increased. Under stress conditions, all genotypes accumulated soluble sugars in both shoots and roots. Proline was another solute that accumulates under stress conditions. It was concluded that soluble sugars could be a suitable criteria for screening plants for higher saline constraints (100 mM NaCl) with root volume and soluble sugars could be used for screening for lower salt conditions.
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