Effects of water supply tension on photosynthetic characteristics and root activity of greenhouse cucumberChinese Full Text
LI Shao1,2,XUE Xu-zhang2,GUO Wen-shan1,LI Xia2,CHEN Fei2 (1Jiangsu Province Key Laboratory of Crop Genetics and Physiology,Yangzhou University,Yangzhou 225009,Jiangsu,China;2National Engineering Research Center for Information Technology in Agriculture,Beijing 100097,China)
Abstract: To study the effects of soil water content on the photosynthesis,fluorescence parameters,and root growth of greenhouse cucumber （Cucumis sativus L.）,a pot experiment was conducted,using a negative pressure water supplying and controlling device to control soil moisture regime.Seven levels of water supply tension （WST）,i.e.,1,3,5,7,9,11,and 13 kPa,were designed.The WST was inversely proportional to soil water content,and the gravimetric soil water content was maintained in the range of 14.23%-42.32%.With increasing WST,the leaf net photosynthetic rate （Pn） in different growth periods showed a parabolic trend,being higher when the WST was 7-11 kPa at initial flowering stage,and was 3-5 kPa at fruiting stage.The reason for the decreased Pn at 9-13 kPa WST was stomatal limitation.Under 1-5 kPa WST,the actual photochemical efficiency （ΦPSⅡ） had a high value,and the possibility of photo inhibition was small.Both the leaf transpiration rate and the chlorophyll content were positively correlated with leaf Pn in different growth periods.Root growth and activity also had a parabolic trend with increasing WST.The maximum root dry mass and root activity happened at 7 kPa and 5 kPa WST,respectively.Our results indicated that a WST of 3-7 kPa was more profitable for the leaf photosynthesis and root growth of greenhouse cucumber.
Keywords：
negative pressure water control; photosynthetic characteristics; fluorescence characteristics; root activity; cucumber;
- DOI：
10.13287/j.1001-9332.2010.0070
- Series：
- Subject：
- Classification Code：
S642.2
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