Effect of high temperatures on some growth variables and gas exchange in tomato (Lycopersicon esculentum Mill. cv. Amalia) plants
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Abstract
the effect of high temperatures on some growth variables and
gas exchange in tomato plants of Amalia cv. Plants were grown
in pots containing silica sand, which were put in trays adding
Hoagland�??s nutrient solution to them. Treatments consisted
of a control having a temperature of 25 gC during the day and
18 gC in the dark period, another treatment in which day and
night temperatures increased 5 gC every four days up to 40
with 33 gC and a variant where plants were subjected to a heat
shock of 40/33 gC day/night respectively for a period of four
days. Once treatment application was concluded, plants were
placed under the same conditions of the control treatment for
12 days, to evaluate their recovery. Evaluations on biomass,
stomatal conductance and CO2 assimilation rate were recorded
at the end of every period of heat treatment and recovery. Data
analysis made evident a depressive effect of different variables
evaluated when increasing environmental temperature;
such effect was not eliminated in some indicators after the
recovery period.
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