Salinity preconditioning effects on water relations, gas exchange and root hydraulic conductivity in tomato plants (Solanum lycopersicum L. cv. Amalia)
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Abstract
objective of studying the behavior of growth, the net
photosynthetic rate, stomatal conductance, hydraulic
conductivity of roots and leaf water, osmotic and turgor
potencials in seedlins of tomato plants submitted to progressive
increase to NaCl in the medium, for this seedlins of tomato
plants (Solanum lycopersicum L. Cv. Amalia) were submitted
to seven different treatments: control (C) plants were maintained
in nutrient solution without NaCl; adapted plants (PC) were
submitted to progressive increase of 25 mM of NaCl each four
days in nutritious solution, in the others treatments were
submitted to 25, 50, 75, 100 and 125 mM of NaCl during all
experimental period. The inhibition of dry mass accumulation
in root system and stem was observed in non adapted plants,
while the leaf dry mass and leaf area were affected in all
treatments in relation to control plants. Saline stress decreased
net photosynthetic rate, stomatal conductance and root
hydraulic conductivity in non adapted plants, however, PC
plants showed good osmotic adjustment, which enabled them
to maintain leaf pressure potential, decreased leaf water
potential and osmotic potential at full turgor while the biologic
activity was appropriate.
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