Salinity tolerance was tested on four different rootstocks (Mr.S.2/5, G.F.655/2, G.F.677 and peach seedling) commonly used for peach. Plants were salinized by adding 80 or 120 mM NaCl to the standard irrigation solution for 14 days, which followed a twoweek period during which the salt concentration was increased stepwise weekly. Leaf water potential, gas exchange, concentration of Cl-, Na+, K+ and soluble carbohydrates were measured at the end of the experimental period. Salt stress decreased the leaf water potential of all rootstocks. A significant decrease in CO2 assimilation rate (A) was measured in leaves of peach and G.F.677 plants treated with 80 and 120 mM NaCl, whereas a smaller inhibition was observed in those of Mr.S.2/5 and G.F.655/2. The rootstocks (G.F.655/2 and Mr.S.2/5) which showed highest stomatal conductance (gs) prior to the onset of salinization were also the least affected by salt treatments. The G.F.677 and G.F.655/2 accumulated less Na+ in the leaf than the other rootstocks when treated with 120 mM NaCl. The salt-induced increase in leaf Cl" was more similar across the four rootstocks. The leaf sorbitol concentration and the sorbitol/sucrose ratio were significantly increased in salt-treated plum rootstocks, but did not change in the G.F.677 and the peach seedling. However, leaf sorbitol concentrations were highest in control plants of these latter rootstocks.

Salinity tolerance in four different rootstocks for peach

MASSAI, ROSSANO;GUCCI, RICCARDO;
1998-01-01

Abstract

Salinity tolerance was tested on four different rootstocks (Mr.S.2/5, G.F.655/2, G.F.677 and peach seedling) commonly used for peach. Plants were salinized by adding 80 or 120 mM NaCl to the standard irrigation solution for 14 days, which followed a twoweek period during which the salt concentration was increased stepwise weekly. Leaf water potential, gas exchange, concentration of Cl-, Na+, K+ and soluble carbohydrates were measured at the end of the experimental period. Salt stress decreased the leaf water potential of all rootstocks. A significant decrease in CO2 assimilation rate (A) was measured in leaves of peach and G.F.677 plants treated with 80 and 120 mM NaCl, whereas a smaller inhibition was observed in those of Mr.S.2/5 and G.F.655/2. The rootstocks (G.F.655/2 and Mr.S.2/5) which showed highest stomatal conductance (gs) prior to the onset of salinization were also the least affected by salt treatments. The G.F.677 and G.F.655/2 accumulated less Na+ in the leaf than the other rootstocks when treated with 120 mM NaCl. The salt-induced increase in leaf Cl" was more similar across the four rootstocks. The leaf sorbitol concentration and the sorbitol/sucrose ratio were significantly increased in salt-treated plum rootstocks, but did not change in the G.F.677 and the peach seedling. However, leaf sorbitol concentrations were highest in control plants of these latter rootstocks.
1998
Massai, Rossano; Gucci, Riccardo; Tattini, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/52143
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