Responses of Morphology, Gas Exchange, Photochemical Activity of Photosystem II, and Antioxidant Balance in Cyclocarya paliurus to Light Spectra

Abstract

Light quality is a critical factor regulating photosynthetic capacity which directly affects the final yield of plants. Cyclocarya paliurus is a multiple function tree species and its leaves are widely used as tea production and ingredient in functional foods in China. However, the effects of varying light quality on photosynthetic process and the photoprotective mechanisms remains unexplored in-depth. In this study, the biomass accumulation, morphology changes, photosynthetic capacity, stomata ultrastructure, pigments content, PSII activity, reactive oxygen species production, antioxidant enzymes, and phenolic content of C. paliurus plants under different light-emitting diodes (LED) light treatments were investigated to test a hypothesis that the difference in photosynthetic efficiency of C. paliurus plants under differential light quality is related to the degree of photoinhibition and the activation of photoprotection. We found that C. paliurus plants performed better under the treatments of WL (white light, 445 and 560 nm) and BL (blue light, 456 nm) than the treatment of GL (green light, 514 nm) and RL (red light, 653 nm). The better performances were characterized by higher values of photosynthetic capacity, total biomass, pigments content, specific leaf mass per area, seeding height increment, leaf thickness and palisade length. In contrast, plants under the treatments of GL and RL suffered significant photoinhibition but effectively developed photoprotective mechanisms. Results of this study provide not only some insights of the response mechanisms of plant photosynthesis to light quality but also a scientific basis for improving the cultivation of C. paliurus plantations.

Photosynthetic characteristics and chloroplast ultrastructure of welsh onion (Allium fistulosum L.) grown under different LED wavelengths

“…In this study, there were significant differences in the growth and development of Welsh onion plants grown under different wavelengths of LED light (Table 1). We found that the full-spectrum, W-treated plants grew best, which is consistent with the conclusions of previous studies on cucumbers and Cyclocarya paliurus [18,38]. Among the monochromatic light treatments, the plants grown in B light were more compact, whereas those grown in G and Y light were not as compact (Fig.…”

Application of Light-emitting Diodes and the Effect of Light Quality on Horticultural Crops: A Review

“…Besides the direct photosynthetic activity, light quality regulates many other physiological aspects that indirectly affect photosynthesis. For example, blue light was suggested to have a higher efficiency in inducing stomatal opening in C3 plants (Hiyama et al, 2017;Liu et al, 2018), which is mediated by cryptochromes (Shimazaki et al, 2007). Blue spectra also affect the relocation of chloroplasts within the cells and, thus, influence light capture (Suetsugu and Wada, 2007).…”

Heterodichogamy, Pollen Viability, and Seed Set in a Population of Polyploidy Cyclocarya Paliurus (Batal) Iljinskaja (Juglandaceae)

“…Publications have mostly stressed the actions of bioactive components, including cyclocariosides, cyclocaric acids, flavonoids, and steroids. These leaf metabolites have been verified to exert important medicinal and health functions on conditions such as hypoglycemia, hypolipidemia, and diabetes mellitus, as well as carrying out antioxidant activities [12][13][14][15][16]. However, leaf resources only from natural stands limited its wide applications.…”