LED光质对辣椒果实色泽品质的影响OA北大核心CSTPCD

In order to explore the effect of LED light quality treatment on the color of pepper fruit,LED blue light(450 nm),LED green light(520 nm),LED red light(660 nm)and LED white light with light intensity of 140 μmol·m-2·s-1 were used,among which LED white light was the control.Under the conditions of temperature 25 ℃,relative humidity 80％and photoperiod 12 h,the pepper fruits 30 days after flowering were irradiated.The color indexes,total chlorophyll content,total carotenoid content,total flavonoid relative content,total anthocyanin relative content,β-carotene content,lutein content,β-cryptoxanthin content,zeaxanthin content,capsanthin content,American Spice Trade Association(ASTA)color value and International Color Units(ICU)color value of pepper fruits were determined before irradiation and at 38 and 46 days after anthesis.The results showed that,compared with the control,LED red light could accelerate the color transformation of pepper fruits,and the color indexes of pepper fruits under LED red light irradiation were significantly better than the control.When compared to ASTA color value,it increased significantly to approximately 3.5 times at 30 days after flowering,capsanthin content increased significantly to 27 times between 38 and 30 days after flowering(P＜0.05).At 46 days after flowering,the capsanthin content and ASTA color value under LED red light were significantly higher than those under the control(P＜0.05).In contrast,LED green light and LED blue light delayed the normal color transformation of the pepper fruit.In conclusion,LED red light irradiation of pepper fruits during the pre-green ripening stage can hasten color change,considerably hasten capsanthin production,and hasten the growth of ASTA color value(P＜0.05).The findings of this research offer novel insights into how LED light quality might hasten the pre-harvest color change of pepper fruits,particularly the accumulation of capsanthin,and increase the quality of fruit color.