Increasing the performance of Passion fruit (Passiflora edulis) seedlings by LED light regimes

Abstract

Due to progress in the industrial development of light-emitting diodes (LEDs), much work has been dedicated to understanding the reaction of plants to these light sources in recent years. In this study, the effect of different LED-based light regimes on growth and performance of passion fruit (Passiflora edulis) seedlings was investigated. Combinations of different light irradiances (50, 100, and 200 µmol m−2 s−1), quality (red, green, and blue light-emitting LEDs), and photoperiods (10 h/14 h, 12 h/12 h and 14 h/10 h light/dark cycles) were used to investigate the photosynthetic pigment contents, antioxidants and growth traits of passion fruit seedlings in comparison to the same treatment white fluorescent light. Light irradiance of 100 µmol m−2 s−1 of a 30% red/70% blue LED light combination and 12 h/12 h light/dark cycles showed the best results for plant height, stem diameter, number of leaves, internode distance, and fresh/dry shoot/root weights. 14 h/10 h light/dark cycles with the same LED light combination promoted antioxidant enzyme activities and the accumulation of phenols and flavonoids. In contrast, lower light irradiance (50 µmol m−2 s−1) had negative effects on most of the parameters. We conclude that passion fruit seedlings' optimal performance and biomass production requires long and high light irradiances with a high blue light portion.

Integrated metabolome and transcriptome analyses provide insight into the effect of red and blue LEDs on the quality of sweet potato leaves

“…(2021) found a lower pigment concentration in two tomato seedlings grown under monochromatic red lights, indicating that PSII had been altered and may be compromised in functionality. However, earlier studies showed that combining blue and red light was more successful in fostering plant growth than monochromatic lighting ( Liang et al., 2021 ). In addition, the photosynthetic rate is increased by red light, which affects the transport of carbohydrates from leaves to roots ( Zhong et al., 2021 ).…”

Ebb-and-Flow Subirrigation Improves Seedling Growth and Root Morphology of Tomato by Influencing Root-Softening Enzymes and Transcript Profiling of Related Genes

“…Chlorophyll content is an important parameter reflecting the photosynthetic capacity of crops [73,74]. Net photosynthetic rate (Pn) reflects the plant photosynthetic capacity [75] and stomatal conductance (Gs) is closely related to plant stress resistance [76]. The water content of soil or substrate is closely related to plant photosynthesis [77,78].…”

Effects of Seasonal Changes on Chlorophyll Fluorescence and Physiological Characteristics in the Two Taxus Species

“…The changes in photosystem II (PSII) photochemistry prior to/after dark reaction activation can be obtained by a continuous excitation fluorometer [ 20 , 21 ] and a pulse-modulated fluorometer [ 22 ], respectively. Recently, the Chl fluorescence imaging (CF-Imaging) technology was used to monitor and diagnose the responses of plant photosynthesis to environmental stresses, such as temperature [ 23 , 24 ], water [ 25 ], salt [ 26 ], and light [ 27 , 28 ], and could be a useful method for the screening of stress-tolerant or -sensitive genotypes, as it could simultaneously obtain the Chl fluorescence parameters and spatial heterogeneity distribution in plant leaves [ 29 , 30 ]. The combination of multiple Chl fluorescence methods for seasonal observations will provide a comprehensive understanding of primary photochemical reactions in Taxus species.…”