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Abstract Cucumis melo L.seedlings of‘Yindi No.3’and‘Xizhoumi No.1’were used to study the effects of
different root-zone temperatures on chlorophyll content,photosynthesis and chlorophyll fluorescence
parameters by Eco-organic soilless cultivation experiments.The results indicated that chlorophyll content,net
photosynthetic rate(Pn)，stomatal conductance(Gs),stomatal limitation value(Ls),transpiration rate
(Tr),chlorophyll fluorescence（F），photochemical quantum yield(Yield),photochemical quenching(qP)and non-
photochemical quenching(NPQ)were decreased with the decreasing of root-zone temperature.The decline of net
photosynthetic rate of Cucumis melo L.was caused by non-stomatal limitations under low root-zone
temperature.Inhibition of PSⅡ photochemistry activity is one of the important causes for low net
photosynthetic rate of Cucumis melo L.seedlings under low root-zone temperature.
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