数字农科院2.0

Lettuce Growth, Nutritional Quality, And Energy Use Efficiency As Affected By Red-Blue Light Combined With Different Monochromatic Wavelengths

文献类型： 外文期刊

作者： Li, L; Tong, YX; Lu, JL; Li, YM; Yang, QC

作者机构：

关键词： Anatomical Structure; Combination Of Light Wavelengths; Photosynthetic Capacity; Plant Factories With Artificial Light; Plant Morphology

期刊名称： HORTSCIENCE

ISSN： 0018-5345

年卷期： 2020 年 55 卷 5 期

页码：

收录情况： JCR（2021版）

摘要： Light, as the energy and signal sources for plant growth and development, is one of the most important environment factors in recently developed plant factories with artificial light (PFALs). To find the optimal combination of light wavelengths for lettuce (Lactuca sativa cv. 'Tiberius') plant growth in a PFAL, four treatments, each using red (R; 662 nm) and blue light (B; 447 nm) with a ratio of 4:1 and photon flux density (PFD) of 150 mu mol.m(-2).s(-1) , and mixing, respectively, with 50 mu mol.m(-2).S-1 of green light (G; 525 nm; RBG), yellow light (Y; 592 nm; RBY), orange light (O; 605 nm; RBO) and far-red light (FR; 742 nm; RBFR), were set up during this experiment. A combination of R and B with a ratio of 4:1 and PFD of 200 mu mol(-2).s(-1) was set as the control (RB). The responses of lettuce growth, morphology, anatomical structure of the lettuce leaf, photosynthetic performance, lettuce nutritional quality, and energy use efficiency were investigated. The results showed that RBG, RBO, and RBFR increased the shoot fresh weight of lettuce by 20.5%, 19.6%, and 40.4%, and they increased the shoot dry weight of lettuce by 24.2%, 13.4%, and 45.2%, respectively, compared with those under RB. The P-n under RBY was significantly lower than that under RB, although no significant differences in chlorophyll or carotenoid content were found between RBY and RB. RBG increased the lettuce leaf area, the thickness of the leaf palisade tissue, P-n, and light use efficiency compared with those under RB. Plants grown under RBO showed better photosynthetic capacity, such as higher P-n,P-Phi(PSII), and other photosynthetic parameters. RBFR caused an increase in lettuce leaf area and energy use efficiency, but a decrease in leaf thickness and P-n of the single leaf. Moreover, tipburn injury was observed under RBFR. Therefore, these results demonstrate that RBG and RBO can be considered optimal combinations of light wavelengths for lettuce growth in a PFAL in this experiment, although plant growth can also be improved by using RBFR.

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