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Study of the beneficial effects of green light on lettuce grown under short-term continuous red and blue light-emitting diodes

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journal contribution
posted on 2023-07-26, 14:49 authored by Zhonghua Bian, Qichang Yang, Tao Li, Ruifeng Cheng, Yvonne A. Barnett, Chungui Lu
Red and blue light are the most important light spectra for driving photosynthesis to produce adequate crop yield. It is also believed that green light may contribute to adaptations to growth. However, the effects of green light, which can trigger specific and necessary responses of plant growth, have been underestimated in the past. In this study, lettuce (Lactuca sativa L.) was exposed to different continuous light (CL) conditions for 48 h by a combination of red and blue light‐emitting diodes (LEDs) supplemented with or without green LEDs, in an environmental‐controlled growth chamber. Green light supplementation enhanced photosynthetic capacity by increasing net photosynthetic rates, maximal photochemical efficiency, electron transport for carbon fixation (JPSII) and chlorophyll content in plants under the CL treatment. Green light decreased malondialdehyde and H2O2 accumulation by increasing the activities of superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11) after 24 h of CL. Supplemental green light significantly increased the expression of photosynthetic genes LHCb and PsbA from 6 to 12 h, and these gene expressions were maintained at higher levels than those under other light conditions between 12 and 24 h. However, a notable downregulation of both LHCb and PsbA was observed during 24 to 48 h. These results indicate that the effects of green light on lettuce plant growth, via enhancing activity of particular components of antioxidative enzyme system and promoting of LHCb and PsbA expression to maintain higher photosynthetic capacity, alleviated a number of the negative effects caused by CL.

History

Refereed

  • Yes

Volume

164

Issue number

2

Page range

226-240

Publication title

Physiologia Plantarum

ISSN

1399-3054

Publisher

Wiley

File version

  • Published version

Language

  • eng

Legacy posted date

2019-12-06

Legacy creation date

2019-12-06

Legacy Faculty/School/Department

ARCHIVED Faculty of Science & Technology (until September 2018)

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