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Responses of Stomatal Traits and Leaf Gas Exchange of Cherry Tomato to Drought Stress


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Responses of Stomatal Traits and Leaf Gas Exchange of Cherry Tomato to Drought Stress
ZHANG Hao1HAO Lihua2YE Jia13GUO Lili2LI Fei2ZHENG Yunpu2
(1.School of Life Science and Engineering,Handan College,Handan,Hebei 056005;2.School of Water Conservancy and Hydropower,Hebei University of Engineering,Handan,Hebei 056038;3.Wild Plant Resources Research Centre in Taihang Mountain of Southern Hebei Province,Handan,Hebei 056005)
drought stressnet photosynthetic rateswater use efficiencystomatal traitsgas exchange efficiencychlorophyll content
To examine the responses of stomatal traits and gas exchange of cherry tomato to drought stress,cherry tomato seedlings were grown in growth chambers for 15 days with different PEG 6000 concentrations of nutrition medium including control (CK,0%),mild water stress (5%),moderate water stress (10%),and severe water stress (15%).The results showed that the stomatal length,stomatal width,stomatal perimeter,stomatal area and stomatal shape index of cherry tomato seedlings were substantially affected by drought stress (P<0.05),but their maximum values were lower than control,except stomatal width.The net photosynthetic rate (Pn),the transpiration rates (Tr) and stomatal conductance (Gs) of cherry tomato seedling was gradually decreased with the increase of drought stress,but intercellular CO2 concentration (Ci) were increased with increasing of drought stress,and significantly higher than Control (P<0.05).Moreover,leaf water use efficiency (WUE) decreases firstly and then increases with increasing of drought stress.In addition,the chlorophyll content featured a bell-shape curve with the increases of drought stress.These results suggested that cherry tomato might maximize the leaf gas exchange efficiency via changing the aperture size and shape of single stoma,the stomatal distribution (stomatal density and spatial distribution pattern of stomata) under salinity stress and the chlorophyll content.The results might be not only important for understanding the relationships among stomatal traits,leaf gas exchange,and chlorophyll content under drought stress,but also provide data and theoretical support for planting cherry tomato on drought soil and selection drought tolerance cherry tomato cultivars.




Last Update: 2019-02-28