首页|Effects of red/blue versus white LED light of different intensities on the growth and organic carbon and autotoxin secretion of hydroponic lettuce
Effects of red/blue versus white LED light of different intensities on the growth and organic carbon and autotoxin secretion of hydroponic lettuce
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NSTL
Korean Soc Horticultural Science
Light is a crucial signal for plant growth， development， and secondary metabolism。 Exploring the effects of light on autotoxin secretion in lettuce can be helpful for improving the utilization efficiency of the nutrient solution in plant factories。 The effects of white light (WL) and the combination of red (R) and blue (B) light (RB， 4R:1B) at different intensities (150， 200， and 250 mu mol m(-2) s(-1)) on the growth and root exudates of hydroponic lettuce (Lactuca sativa L。) were studied in a closed plant factory。 The lettuce biomass and photosynthetic rate increased with the increasing light intensity， and the photosynthetic rate was significantly lower under WL than under RB at both 200 and 250 mu mol m(-2) s(-1)。 Lettuce under WL had the longest root length and highest root surface area at 200 mu mol m(-2) s(-1)， while the root length， root surface area， and root volume under RB were the highest at 250 mu mol m(-2) s(-1)。 Total organic carbon (TOC) content of root exudates in the nutrient solution based on shoot or root dry weight decreased with the increasing light intensity。 With the increase in light intensity， the secretion of four autotoxins (benzoic acid， ferulic acid， gallic acid， and tannic acid) based on shoot dry weight and root dry weight decreased under WL。 Compared with RB， WL significantly reduced the secretion of autotoxins at 250 mu mol m(-2) s(-1)。 In conclusion， 250 mu mol m(-2) s(-1) white light should be used for high lettuce yield， and it could also decrease the autotoxins in the nutrient solution and the occurrence of autotoxicity。
NSTL
Korean Soc Horticultural Science
