Effects of potassium deficiency on water relations and photosynthesis of the tomato plant |
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Authors: | M H Behboudian D R Anderson |
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Institution: | (1) Department of Horticultural Science, Massey University, Palmerston North, New Zealand |
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Abstract: | Potassium deficient (−K) and potassium sufficient (+K) plants were exposed to four days of water stress. Well watered −K and
+K plants had comparable rates of transpiration. But +K plants had a larger leaf area and depleted the soil moisture to a
greater extent on day 1 of stress. For days 2 and 3 their transpiration rate, leaf water potential and relative water content
fell below those of −K plants. Well watered −K plants had a significantly lower rate of photosynthesis than +K plants. Photosynthesis
of −K plants was more sensitive to reduction in plant water potential than that of +K plants. Reduction of photosythesis in
−K leaves was due to impairment of photosynthetic capacity and not to stomatal closure. Growth was significantly reduced in
−K plants. |
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Keywords: | growth photosynthesis potassium stomata tomato transpiration water potential water relations |
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