Influence of Light Intensity on the Photosynthesis and Phenolic Contents of Mangifera Indica

Abstract

Light is an important environmental factor that have an influence on a plants photosynthesis and production of secondary metabolites like phenolic compounds and flavonoid. Mangifera indica from the family Anacardiaceae is known to have bioactivity due to its phenolic and flavonoid contents. The objective of the study is to determine the influence of light on the photosynthesis and phenolic contents of M. indica. Photosynthesis of the plant was measured using a portable photosynthesis system referred to as LICOR-6400. Photosynthetic pigments as well as phenolic and flavonoid contents were quantified using a UV-VIS spectrophotometer. The outcome derived from the study shows that sun exposed leaves of the studied plant were having the maximum photosynthesis, saturation and compensation points (P < 0.05). Moreover, sun exposed leaves were having higher carotenoid, phenolic and flavonoid contents but lower chlorophyll contents. This leads to a conclusion that sun leaves of M. indica contribute the highest photosynthesis and phenolic contents to the plant.

The Mastic Tree (Pistacia lentiscus L.) Leaves as Source of BACs: Effect of Growing Location, Phenological Stage and Extraction Solvent on Phenolic Content

“…Linatoc et al . ( 34 ) reported that M. indica leaves exposed to the sun accumulated higher amounts of phenolic compounds than the shaded ones.…”

A Metabolomics Approach and Chemometric Tools for Differentiation of Barley Cultivars and Biomarker Discovery

“…Several studies demonstrated an increase in the production of phenolic acids and flavonoids following high light exposure. In this case, no stress was applied to the plants; however, leaves are naturally more exposed to light as compared to roots [ 38 ]. This can explain the presence of a higher number of phenolic compounds in leaves compared to roots.…”

Metabolic Variations in Grass C. dactylon and Selection of Optimal LEDs for the Horticulture Luminaire Using LM Algorithm

“…This normalized SPD is multiplied with the conversion factor F to obtain the simulated SPD [24] using " (13)," Φe,v = Φ(𝝺,𝞓𝝺0.5,𝝺o) * F (13) where F represents the ratio of total radiant power or luminous flux or PPF and integral of the normalized spectrum [23]. If the PPF is known, F can be calculated using " (14)," 𝐹 = 𝛷 𝑝 8.359 * 10 −3 * ∑ 𝜆 * 𝛷(𝜆,𝛥𝜆 0.5 ,𝜆 0 ) * 𝛥𝜆 700 𝑘=400 (14) If only the total radiant power is known, F can be calculated using " (15)," 𝐹 = 𝛷 𝑒 ∫ 𝛷(𝜆,𝛥𝜆 0.5 ,𝜆 0 ) * 𝑑𝜆 (15) If only the luminous flux is known, F can be calculated [24] using " (16)," 𝐹 = 𝛷 𝑣 𝑘 ∫ 𝛷(𝜆,𝛥𝜆 0.5 ,𝜆 0 ) * 𝑉(𝜆) * 𝑑𝜆 (16) Initially, the SPD of the LED light source was considered as the target spectrum. For mimicking the target spectrum, the selection of optimal LEDs is required.…”

“…Plant phenolic content, considered the best natural antioxidant to prevent several illnesses such as cancer, diabetes, inflammatory problems [8]. Phenolic compounds are synthesized by plants to survive stress conditions and play a vital role in accumulating phenolic compounds [15], [16].…”