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The effect of sodium chloride salinity and water stress with poly ethylene glycol on nitrogen fixation stomatal response and transpiration of medicago sativa trifolium repens cultivar aberystwyth s 184 and trifolium brachycalycinum subclover



The effect of sodium chloride salinity and water stress with poly ethylene glycol on nitrogen fixation stomatal response and transpiration of medicago sativa trifolium repens cultivar aberystwyth s 184 and trifolium brachycalycinum subclover



Physiologia Plantarum 54(3): 361-366



The behavior of different legumes against salinity and water stress was studied to discover simultaneous adaptations to both stresses. The N2 fixation, transpiration, predawn leaf water potential and stomatal response of M. sativa L. (cultivars Tierra de Campos and Aragon), T. repens L. (cv. Aberystwyth S-184) and T. brachycalycinum Katzn. et Morley (= T. subterraneum L. cv. Clare) were compared at 3 levels of stress (0.05, 0.3 and 0.5 MPa [pascals] of either NaCl or polyethylene glycol [PEG] 6000) in nutrient solution. The plants were stressed for 3 days and then returned to control nutrient solution. The changes in the parameters analyzed were dependent on the proportion of stress treatments and the nature of the species, always being greater in plants from PEG than from NaCl solutions. Transfer of lucerne and subclover plants from NaCl at 0.05 MPa to non-saline medium resulted in an increase of N2 fixation above the level of the non-salinized control plants, especially significant in lucerne. Analysis of possible inorganic impurities in commercial PEG suggest that such type of impurities are not responsible for the toxic effects reported. Plant damage resulting from PEG treatment was apparently due to penetration of PEG (as determined qualitatively by using the tetraiodinebismuthic acid technique) or low-molecular organic impurities into the plant. The adaptation of the different species to salinity and water stress is discussed. The best performance was given by cv. Tierra de Campos.

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