Photosynthetica 2020, 58(3):740-747 | DOI: 10.32615/ps.2020.013

Photosynthetic characteristics and growth performance of lettuce (Lactuca sativa L.) under different light/dark cycles in mini plant factories

J. ZHOU1, J.Z. WANG1, T. HANG1, P.P. LI2
1 Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education & Jiangsu Province, Jiangsu University, 212013 Zhenjiang, China
2 Nanjing Forestry University, 210037 Nanjing, China

We investigated the photosynthesis and growth of lettuce (Lactuca sativa L.) grown under three light/dark cycles in a mini plant factory with artificial illumination. A relative longer light cycle [12/12 h (light/dark)] increased not only light-response curve parameters, such as light-saturated net photosynthetic rate, light-saturation point, light-compensation point, dark respiration rate, but also upregulated CO2-response curves parameters, such as CO2-saturated net photosynthetic rate, initial carboxylation efficiency, and photorespiration rate, compared to those of the shorter light cycles [6/6 h and 3/3 h (light/dark)]. A longer light cycle enhanced electron transfer potential, increased the chlorophyll amount, leaf area, and biomass and reduced the root/shoot ratio and the specific leaf area. Our results imply that the prolonged light cycle led to the increase in photosynthetic capacity and significantly enhanced the growth rate of lettuce.

Additional key words: biomass accumulation; chlorophyll fluorescence; leaf gas exchange; morphogenesis; photoperiod.

Received: October 8, 2019; Revised: January 22, 2020; Accepted: February 4, 2020; Prepublished online: April 18, 2020; Published: June 11, 2020  Show citation

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ZHOU, J., WANG, J.Z., HANG, T., & LI, P.P. (2020). Photosynthetic characteristics and growth performance of lettuce (Lactuca sativa L.) under different light/dark cycles in mini plant factories. Photosynthetica, 58(3), 740-747. doi: 10.32615/ps.2020.013
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