Effect of different light quality of LED on growth and photosynthetic character in cherry tomato seedling.

摘要

In this study, growth and photosynthetic character of cherry tomato seedlings were investigated under seven light qualities: dysprosium lamp (white light, C), red LEDs (R), blue LEDs (B), yellow LEDs (Y), green LEDs (G), red and blue LEDs (RB) and red and blue and green LEDs (RBG) with the same photosynthetic photon flux density (PPFD) about 320 micro mol m-2 s-1 for 30 days. Compared with the C treatment, the plants under RB and RBG were significantly stronger and shorter, while under Y, G and R were weaker and higher. Photosynthetic pigments were shown to have significant difference under respective light irradiations of LEDs. The highest photosynthetic pigments were in leaves of seedlings with RBG treatment, but the lowest pigments were in those with R and Y treatments. Net photosynthetic rate (Pn) was the highest in leaves of seedlings with RB and RBG treatment and the lowest in those with G treatment. Electronic transport rate (ETR), quantum yield of PSII ( Phi PSII) and photochemical quenching (qP) under RB and RBG were significantly greater than those of other treatments. Taken together, RB and RBG of LEDs were shown to be beneficial factors for the growth and photosynthesis of cherry tomato seedlings.