A Preliminary Experiment on the Effects of Leaf Wetting on Gas Exchange in Tomato Leaves

Q3 Agricultural and Biological Sciences Environmental Control in Biology Pub Date : 2018-01-01 DOI:10.2525/ECB.56.13
G. Yokoyama, D. Yasutake, M. Kitano
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引用次数: 5

Abstract

To evaluate the effects of leaf wetting on midday depression of photosynthesis in horticultural crops, we analyzed leaf gas exchange (transpiration rate, stomatal conductance, photosynthetic rate) of tomato plants under two different treatments (the Wet treatment and No-wet treatment as control). The gas exchange was measured at 11:00 (the time at which leaf gas exchange was assumed to be active) and 14:00 (the time at which leaf gas exchange was assumed to be inactive due to midday depression) on the clear days of November 2 to 7, 2016. The gas exchange measurements in the Wet treatment were conducted just after droplets on the leaf surface had evaporated. In the No-wet treatment, transpiration rate, stomatal conductance, and photosynthetic rate at 14:00 were decreased compared to those at 11:00. This suggests that midday depression occurred due to stomatal closure induced by excessive transpirational water loss. In contrast, in the Wet treatment, there was no such depression of leaf gas exchange, suggesting that leaf wetting might contribute to maintaining stomatal aperture through improving leaf water status. Thus, leaf wetting could avoid midday depression of photosynthesis in tomato plants.
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叶片湿润对番茄叶片气体交换影响的初步试验
为评价叶片润湿对园艺作物光合作用午间抑制的影响,以番茄为对照,分析了不同处理(湿处理和不湿处理)下叶片气体交换(蒸腾速率、气孔导度、光合速率)。气体交换在2016年11月2日至7日的晴天11:00(假定叶片气体交换活跃的时间)和14:00(假定叶片气体交换由于正午洼地而不活跃的时间)进行测量。湿处理中的气体交换测量是在叶片表面的液滴蒸发后进行的。在无湿处理下,14:00的蒸腾速率、气孔导度和光合速率均较11:00降低。这表明正午低潮的发生是由于过度的蒸腾水分损失引起的气孔关闭。而在湿处理下,叶片气体交换没有受到抑制,说明叶片湿润可能通过改善叶片水分状态来维持气孔孔径。因此,叶片湿润可以避免番茄植株中午光合作用的抑制。
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来源期刊
Environmental Control in Biology
Environmental Control in Biology Agricultural and Biological Sciences-Agronomy and Crop Science
CiteScore
2.00
自引率
0.00%
发文量
25
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