NaCl effects on water relations and accumulation of mineral nutrients in shoots, roots and cell sap of wheat seedlings.

摘要

Triticum durum cv. Ofanto and cv. Adamello were exposed to 0, 50 and 100 mmol NaCl/litre nutrient solutions for 9 days in a controlled environment. The highest salt concentration reduced shoot growth, particularly in Adamello which was more sensitive to heavy metals and drought than Ofanto, and shoot and root biomass production. In both cultivars, water potential (PSIW) and osmotic potential (PSIpi) decreased with salinity and the osmotic adjustment that occurred, due to an accumulation of Na, Cl and also K in the cell sap, maintained turgor. NaCl altered nutrient uptake, due to an accumulation of Na+ and Cl- both in shoots and roots. In particular, Adamello showed higher decreases in the Ca2+ of roots and the K+ of shoots and a higher increase inthe Na+ of shoots. Even though both cultivars reacted to the stress, cv. Adamello was more sensitive to NaCl.