Document Type : Research Paper
Authors
1 Ph.D. Student, , Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University,
2 Associated Professor, Department of Horticultural Sciences, Faculty of Agriculture, Lorestan University,
Abstract
Temperature stress is one of the most common abiotic stress in plant. Leaf gas exchange
is on the first process that is effected by temperature. In order to investigate the effect
of short-term heat shock in root zone on stomatal behavior and gas exchange on Trasescantia,
this experiment was conducted at Faculty of Agriculture, Lorestan University. Roots
were treated with three different temperatures (25, 35 and45 °C) for 10 min and stomatal
behavior were measured. The result showed that aperture and photosynthesis rate were
the highest in 35°C. As temperature increased to 35°C, photosynthesis rate and aperture
area increased 7% and 24%, respectively, compared with those of control plants (25°C).
However, as temperature increased to 45°C, transpiration rate and stomatal conductance
decreased 40% and 14%, respectively, compared with those of control plants. Exposure
of roots to 45°C for 30 min caused 72% reduction in photosynthesis rate. According to
the results, root zone temperature significantly affect stomatal behavior, gas exchange and
photosynthesis.
Keywords
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