Effects of different light intensities on anti-oxidative enzyme activity, quality and biomass in lettuce
Fu, W., Jiangsu Univ., Zhenjiang (China). Key Lab. of Modern Agricultural Equipment and Technology | Li, P., Nanjing Forestry Univ. (China) | Wu, Y., Jiangsu Univ., Zhenjiang (China). Key Lab. of Modern Agricultural Equipment and Technology | Tang, J., Jiangsu Univ., Zhenjiang (China). Key Lab. of Modern Agricultural Equipment and Technology
In the present study, the effects of different light intensities on antioxidative enzyme activity, yield and quality of lettuce were investigated. The results reveal the following: (1) judged by the dynamics of antioxidative enzyme activity, there was no light stress to occur in the 100, 200 and 400 micromol/square m/s treatments, a mild light stress occurred in the 600 micromol/square m/s treatment, and a serious light stress occurred in the 800 micromol/square m/s treatment; (2) increased light intensity gradually reduced the levels of soluble proteins and nitrates in lettuce, whereas the concentration of soluble sugars remarkably increased. The biomass of a single plant of lettuce in the 600 micromol/square m/s treatment was the highest and second highest in the 400 micromol/square m/s treatment but was the lowest in the 100 micromol/square m/s treatment. No significant difference in the biomass of single plant was observed between the 400 and 600 micromol/square m/s treatments. Based on these results, the range of 400 micromol/square m/s to 600 micromol/square m/s is a recommendable light intensity for lettuce production.
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