Although spectrum conversion films are used to improve the photosynthetic efficiency and, ultimately, crop growth, the effects of the modified spectrum on photosynthetic traits in plants have not yet been sufficiently reported. The objective of this study was to investigate the changes in photosynthetic performance and chlorophyll fluorescence of sweet pepper (Capsicum annuum L.) under a green-to-red conversion (GtR) film. The GtR-modified spectrum increased the dry mass and decreased the petiole length. The photosynthetic light-response curves were significantly improved, and the gap of the maximum photosynthetic rates increased over time after covering. The GtR-modified spectrum significantly increased chlorophyll fluorescence parameters in the JIP-test, such as parameters related to the reduction of end electron acceptors on the PSI acceptor side, the efficiency for electron transport in PSII, and the performance indexes. Our data indicated that the GtR-modified spectrum promotes electron transfer around PSI, improving photosynthetic performance and growth.
This study aims to investigate the effect of spectrum conversion film on seedling quality and photosynthetic traits of leaf and fruit vegetables. Lettuce, Chinese cabbage, and cucumber seeds were sown in 50-cell plug trays filled with commercial seedling media and grown under a spectrum conversion film (SCF) and a poly-ethylene film as a control. The SCF decreased blue-green light and increased red light, and thereby increased the R/FR ratio and R/B ratio of solar spectrum, which was sufficient to affect the photosynthesis, growth, and morphogenesis of the seedlings. The photosynthetic rates of Chinese cabbage and cucumber were significantly increased under the SCF, and their maximum photosynthetic rates were 23% and 19%, respectively. However, the growth of lettuce was decreased under the SCF, and the plant height and leaf length became longer, resulting in a decrease in seedling quality. Although the morphology of Chinese cabbage grown under the SCF was not changed compared to the control, the leaf dry weight increased and its dwarf rate was 10%. The growth of cucumber under the SCF was similar to that of the control, but the plant height and petiole were significantly reduced, resulting in a high dwarf rate of 24%. It was concluded that the solar spectrum modified by the SCF increased the photosynthetic efficiency and improved the seedling quality of Chinese cabbage and cucumber.
yield of PSII photochemistry in the dark-adapted state; gs -stomatal conductance; LA -leaf area; LCP -light-compensation point; MDA -malondialdehyde content; PN -net photosynthetic rate; PNmaxlight-saturated net photosynthetic rate; RD -dark respiration rate; ФNA -quantum yield of nonphotochemical energy dissipation in PSI in the light-adapted state due to the acceptor-side limitation; ФND -quantum yield of nonphotochemical energy dissipation in PSI in the light-adapted state due to the donor-side limitation; ФNO -quantum yield of nonregulated fluorescence quenching; ФNPQ -quantum yield of nonphotochemical quenching; ФPSI -effective quantum yield of PSI photochemistry in the light-adapted state; ФPSII -effective quantum yield of PSII photochemistry in the light-adapted state.
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