ECOPHYSIOLOGICAL RESPONSE OF KIWI, CV.HAYWARD TO WATER AND SALT STRESS IN THE STAGE OF VEGETATIVE GROWTH
Abstract
THE EFFECTS OF WATER DEFICIT AND SALT STRESS ON GROWTH, CO2 EXCHANGE AND PLANT WATER RELATIONS WERE STUDIED IN ROOTED CUTTINGS OF KIWI (ACTINIDIA SINENSIS, PLANCH), CV. HAYWARD, GROWN UNDER CONTROLLED CONDITIONS. UNDER SEVERE WATER STRESS, PRESSURE- VOLUME ANALYSIS OF PLANT WATER RELATIONS SHOWED PARTIAL TURGOR MAINTENANCE, AS A RESULT OF COMBINED EFFECT OF PARTIAL OSMOTIC ADJUSTMENT AND CELLWALL ELASTICITY. WATER DEFICIT REDUCED PHOTOSYNTHETIC RATE BY 64% AND 53% AT THE LEVELS 40% AND 65% OF FIELD CAPACITY, WHILE NO SIGNIFICANT DIFFERENCE WAS OBSERVED BETWEEN THE TREATMENTS 85% AND 100% OF FIELD CAPACITY. THE DECLINE OF PHOTOSYNTHESIS WAS DUE TO STOMATAL CLOSURE AND INHIBITION OF PHOTOSYNTHETIC PROCESS AT CHLOROPLAST LEVEL. PLANT DRY WEIGHT REDUCED BY 58-66% AND LEAF AREA BY 72-77% UNDER SEVERE WATER STRESS. AT RELATIVELY HIGH SALT CONCENTRATION (30 MMOL/L) KIWI PLANTS SHOWED AN OSMOTIC ADJUSTMENT OF 0.11 MPA, WHICH WAS INADEQUATE TO COMPENSATE FOR LOWERED WATER POTENTIAL. SODIUM ACCU ...
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