ISHS Acta Horticulturae 278: Symposium on Scheduling of Irrigation for Vegetable Crops under Field Condition
EFFECT OF DIFFERENT LEVELS OF SALINITY ON BEAN (PHASEOLUS VULGARIS L.) LEAF WATER STATUS |
| Authors: | P. Ceccon, M. Martin, G. Zerbi |
| Abstract:
A greenhouse research was carried out on bean (Phaseolus vulgaris L.), a salt sensitive species, comparing four levels of NaCl in the nutrient solution (0, 0.03, 0.06, 0.12 molal) applied when the first trifoliate leaves were just beginning to develop (Long Treatment, LT) or when such leaves were almost fully expanded (Short Treatment, ST). PV relationships were determined on the same leaves at the end of their development (respectively after 18 and 6 days of treatment) and on the roots of the plants. The leaf dry weight and the turgid weight/dry weight ratio decreased as NaCl concentration increased; both of these traits were lower in the ST treatment. Osmotic pressures at full turgor and at zero turgor increased in response to the salinity treatments; the relative water content at zero turgor was independent from the total water potential resulting from the salinity treatments. Apoplastic water fraction and bulk modulus of elasticity were affected by a high degree of uncertainty; similarly, determinations on roots were highly variable. | |
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