Effects of Supplementary LED Light with Different Color Temperature on Quality of Greenhouse Tomato Seedlings
Insufficient light in greenhouse in autumn and winter or early spring seriously affects growth and development of tomato seedlings.Therefore,supplementary light is particularly important for production of greenhouse tomato seedlings.In this experiment,"Fenbeibei"was used as the test tomato variety,and white LED lights with color temperature at 3 000 K,4 000 K and 6 500 K and red plus blue(RB)LED light were used as supplementary lights with no supplementary light as control(CK).The effects of different supplemen-tary light quality on growth,photosynthetic pigment content,biomass and other quality indexes of tomato seed-lings were studied.The results showed that supplementary white LED light with color temperature at 3 000 and 4 000 K significantly increased the total leaf area of tomato seedlings,promoted the synthesis of photosynthetic pigments and the accumulation of biomass,and significantly inhibited the elongation of hypocotyls.Compared with CK,the stem diameter and total leaf area of tomato seedlings under white LED light with color tempera-ture at 3 000 K increased by 42.3％and 121.6％,respectively,and the hypocotyl length decreased by 19.6％;the contents of chlorophyll a,chlorophyll b,carotenoid and total chlorophyll of tomato seedlings under white LED treatment with color temperature at 4 000 K increased by 77.8％,61.7％,66.7％and 73.6％,respec-tively.The seedling quality index of tomato seedlings under white light treatment with color temperature at 3 000 K and 4 000 K increased by 141.0％and 119.0％compared with CK,but there was no significant difference compared with RB.In addition,the plant height,total leaf area,photosynthetic pigment content,shoot fresh weight,shoot dry weight,total fresh weight and total dry weight of tomato seedlings had quadratic function relationships with the proportion of blue light in the supplementary light source.In summary,white LED with lower color temperature could be used as supplementary light source for culture of tomato seedlings in greenhouse in autumn and winter.
Supplementary LED lightProportion of blue lightLight qualityTomato in greenhouseSeedling qualityHypocotyl length
万方数据
维普
