Chlorophyll Fluorescence, Chlorophyll Content, Graft-taking, and Growth of Grafted Cucumber Seedlings Affected by Photosynthetic Photon Flux of LED Lamps
2018
Kim, H.G., Chonbuk National University, Jeonju, Republic of Korea | Lee, J.S., National Institute of Agricultural Sciences, RDA, Wanju, Republic of Korea | Kim, Y.H., Chonbuk National University, Jeonju, Republic of Korea
Chlorophyll fluorescence, chlorophyll content, graft-taking and growth of grafted cucumber seedlings as affected by photosynthetic photon flux (PPF) of LED lamps were analyzed in this study. Four PPF levels, namely 25, 50, 100, 150 micromoleㆍm-²s-¹ were provided to investigate the effect of light intensity on the chlorophyll fluorescence, chlorophyll content, graft-taking and growth of grafted cucumber seedlings. Air temperature, relative humidity, and photoperiod for graft-taking were maintained at 25 ℃, 90%, 16hㆍd-1, respectively. Maximum quantum yield (Fv/Fm) of rootstock as affected by PPF was found to be 0.84-0.85 and there was no significant change in Fv/Fm. Even though Fv/Fm of scion measured at 2 days after grafting was lowered to 0.81-0.82, after then it gradually increased with increasing PPF. At 4 days after grafting, the chlorophyll content extracted from scion increased with increasing PPF.
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