Effects of Pulsed Light with Different Duty Ratio on Growth and Photosynthetic Fluorescence Characteristics of Lettuce

doi:10.7668/hbnxb.20191547

Abstract

Abstract: To explore pulsed light duty ratio on the horticultural crop growth and photosynthesis,glass lettuce as the research object,the instantaneous intensity of 200 μmol/(m²·s),frequency of 128 Hz conditions,we measured the pulsed light different duty ratio(20%,40%,60%,80%,100%) processing of lettuce chlorophyll content,photosynthetic parameters,biomass,light energy utilization rate and chlorophyll fluorescence parameters.The results showed that under 60%,80% duty ratio processing lettuce chlorophyll content,fresh weight of root,dry weight of shoot,dry weight of root,actual photochemical quantum efficiency of PSⅡ Y(Ⅱ),photosynthetic electron transport rate ETR and continuous light(100% duty ratio) were not significant difference,80% duty ratio process of quantum efficiency of PSⅡ photochemistry effectively Fv'/Fm' was 6.44% higher than the continuous light,non photocheical quenching NPQ,regulatory light quantum efficiency of energy dissipation Y(NPQ) than continuous light was reduced by 37.08%,33.86% respectively.Although the light energy utilization under 20% duty ratio treatment was significantly higher than that under continuous light treatment,the chlorophyll content,biomass,net photosynthetic rate,Y(Ⅱ) and other parameters were significantly lower than that under continuous light treatment,which was not conducive to the normal growth of lettuce.In general,LED pulsed light with frequency of 128 Hz could save electric energy. High duty ratio not only achieved the same effect of continuous light on the premise of power saving,but also was more conducive to promoting PSⅡ photosynthetic electron transfer and improving the potential of photosynthesis of crops,providing a theoretical basis for the development of efficient and energy-saving LED plant supplementary light.

Key words: Lettuce, Duty ratio, Pulsed light, Chlorophyll fluorescence, Photosynthesis

CLC Number:

S636.01

MEI Yanhao, LI Qi, LIU Qi, YU Huibin, ZHANG Yuhui, WU Yongjun, YANG Zhenchao. Effects of Pulsed Light with Different Duty Ratio on Growth and Photosynthetic Fluorescence Characteristics of Lettuce[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2021, 36(2): 108-115. doi: 10.7668/hbnxb.20191547.

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