Effects of different LED illumination on physiological characteristics of to-mato seedlings and flowering and fruiting after planting
The effects of five different light emitting diode(LED)illumination on the growth and physiological char-acteristics of tomato seedlings and the flowering and fruiting after planting were studied by using tomato variety Qianxi as the experimental material.The results showed that compared with the white light control(CK),the plant height of tomato seed-lings treated with white light∶blue light=1∶1(WB),white light∶red light∶blue light=1∶1∶1(WRB),white light∶red light=1∶1(WR),red light∶blue light=1∶1(RB)decreased significantly.The stem diameter of tomato seedlings treated with WRB and WR decreased significantly,and the strong seedling index of tomato seedlings treated with WB and RB increased significantly.The net photosynthetic rate,transpiration rate,intercellular CO2 concentration and stomatal conductance of tomato seedlings under WB,WRB and RB treatments were significantly increased.The activities of superoxide dismutase(SOD)and peroxidase(POD)in leaves of tomato seedlings were significantly in-creased in WB,WR and RB treatments,while the activity of catalase(CAT)was significantly decreased.The content of malondialdehyde(MDA)in tomato seedling leaves increased significantly in WR treatment,while the content of MDA in tomato seedling leaves decreased significantly in WB treatment and WRB treatment.WB,WRB and RB treatments signifi-cantly increased the initial flowering stage,early yield,total yield,soluble sugar content,titratable acid content and sugar-acid ratio of tomato seedlings after planting.In summary,WB,WRB and RB treatments had different degrees of promotion effects on tomato seedling growth and strong seedling cultivation,as well as the initial flowering period,yield and quality of tomato plants after planting,and the promotion effect of WB treatment was the best.
LED illuminationtomatophotosynthesisantioxidant enzyme activityyield
万方数据
维普
