TAILIEUCHUNG - Physiological and nutritional responses of chickpea (Cicer arietinum L) to salinity
The aim of this study was to evaluate growth, nodulation, nitrogen fixation, and ionic repartition in 2 chickpea varieties, namely Chetoui and Amdoun, which are grown under salt stress. | Research Article Turk J Agric For 33 (2009) 503-512 © TÜBİTAK doi: Physiological and nutritional responses of chickpea (Cicer arietinum L) to salinity Abdelmajid KROUMA* Laboratory of Plant Adaptation to Abiotic Stress, Centre of Biotechnology Borj Cedria Ecopark, BP 901, Hammam Lif 2050, TUNISIA Received: Abstract: The aim of this study was to evaluate growth, nodulation, nitrogen fixation, and ionic repartition in 2 chickpea varieties, namely Chetoui and Amdoun, which are grown under salt stress. Inoculated seedlings were grown in a nutrient solution that lacked NaCl (control) or supplemented with 25 or 50 mM NaCl. Whole plant and nodule growth, nitrogen fixation and sodium, and chloride and potassium partitioning were subsequently evaluated. In comparison to Chetoui, Amdoun maintained a high level of whole plant and nodule growth and had a greater nitrogen fixation activity. Nitrogenase activity measurements demonstrated that nodule senescence was more precocious in Chetoui than in + + Amdoun. Genotypic differences were observed at the level of Na , Cl , and K distribution between organs: Amdoun + showed the lowest leaf and nodule Na and Cl concentrations and the highest K+ concentrations in these organs, particularly under severe salinity (50 mM) condition. These findings suggest that the relative tolerance of Amdoun is + linked to its ability to protect its photosynthetic and symbiotic apparatus against the toxic Na and Cl ions and to ensure + an appropriate K supply of these organs. Key words: Cicer arietinum, ionic repartition, N2 fixation, salinity. Introduction Chickpea is one of the most important legume crops for human nutrition and has been traditionally cultivated in saline soils in arid and semi-arid regions (Rao et al. 2002). The agronomical importance of chickpea (Cicer arietinum L.) is linked to its high protein content (25%-29%) (Hulse 1991). Although chickpea is considered to be a salt-sensitive species, the .
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