Abstract
Effects of short-term flooding on stomatal conductance and net photosynthesis of Capsicum annuum L. plants were studied under controlled-environment conditions. Flooding of soil induced significant stomatal closure and decline in net photosynthesis. Average diurnal stomatal conductance declined from 145 to 78 mmol H 2O m −2 s −1 during the 1st day and to 18 mmol H 2O m −2 s −1 during the 2nd day of flooding, while average diurnal net photosynthesis was reduced from 7.5 μmol CO 2 m −2 s −1 to 7.0 and 5.8 μmol CO 2 m −2 s −1 during the 1st and 2nd day of flooding, respectively. Low levels of stomatal conductance and net photosynthesis continued throughout the entire experiment, and average daily net photosynthesis fell substantially during the 4th day of flooding. The recovery of stomatal conductance and net photosynthesis during the 3 days following termination of flooding was relatively slow. Rapid stomatal closure and declines in net photosynthesis, coupled with slow recovery, are important factors contributing to the intolerance of Capsicum plants to flooding.
Published Version
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