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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, 150μmol·m·s 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 25C, 90%, 16h·d, 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. Graft-taking ratio of grafted cucumber seedlings was 90-95% as PPF was ranged from 25μmol·m·s to 100μmol·m·s. However, the graft-taking ratio of grafted seedlings healed under PPF of 150μmol·m·s was decreased to 80%. Maximum PPF measured required for smooth joining of rootstock and scion was assumed to be 100μmol·m·s. At healing stage of grafted cucumber seedlings, Fv/Fm of scion decreased and at least two days after grafting were required for rooting of grafted seedlings. Chlorophyll fluorescence response of rootstock and scion was linked to light irradiation. Therefore, it was concluded that physical environment including light and humidity during healing process of grafted seedlings should be controlled more precisely to facilitate root formation and to prevent scion from lowering Fv/Fm. Further studies are required to investigate the effects of root development and joining of vascular bundles of grafted seedlings on the chlorophyll content of scion. Additional key words : chlorophyll, cucumber seedlings, grafting, maximum quantum yield, photosynthetic photon flux

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Chlorophyll Fluorescence, Chlorophyll Content, Graft-taking, and Growth of Grafted Cucumber Seedlings Affected by Photosynthetic Photon Flux of LED Lamps