Abstract:

The objective of our study was to analyze the effect of light qualities on Fp685、Fp735、Fp685/ Fp735、F685、F735、 F685/ F735 and Y（II）of Chlorophyll fluorescence in green leaves green leaves induced by blue, green and red light-emitting diode (LED) in northern white cucumber seeding. With the increase of light intensity, the P in OJIP of Chlorophyll fluorescence curve showed a fast rising. Fp685 were in the order of red>blue>green, but Fp735 were in the order of green >red≈ blue. However, the order of blue>green≈ red were observed for the ratio of Fp685/ Fp735.The point of P appeared earlier under the mixed light than under single light, and Pmix>Psingle. The ratio of F685/ F735 always lower under the mixed lights than under single light. The order of Y（II）green> Y（II）red> Y（II）blue were observed for the Yield of PSⅡ by single light.