Effect of salinity on root hydraulic conductivity and shoot water relations in two tomato (L. esculentum and L. chessmanii) species
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Abstract
objective of studying the behavior of the hydraulic
conductivity of roots and water relations in leaves from two
tomato (Lycopersicon esculentum Var. Amalia and
Lycopersicon cheesmanii) species submitted for short periods
to different treatments with NaCl in the medium. Plants
developed in flowerpots with silica sand put in trays and
adding Hoagland�??s nutritious solution. The hydraulic
conductivity of roots was immediately determined to a group
of four plants per treatment, introduced in containers with the
nutritious solution to which NaCl was added at the rate of 0,
25, 50, 75, 100, 150 and 200 mM and to another group of four
plants per treatment, which remained for 24 hours in the
nutritious solution with 0, 100 and 200 mM NaCl, besides
determining the hydraulic conductivity, leaf water potential,
osmotic potential, pressure potential (by estimating the general
potential equation) and saturated osmotic potential; the
relationship between hydraulic conductivity and leaf water
potential was established. The analysis of data indicated a
strong reduction of the hydraulic conductivity of roots in both
species, as soon as they were exposed to the treatment with
saline solution, but conductivity was always higher in the
wild species. Also, the other variables evaluated were affected
by salinity and it was appraised that osmotic adjustment had
not yet taken place 24 hours before applying the treatments.
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