Abstract
Light is an essential energy source for plant photosynthesis, although it can also be a stress-causing element. Therefore, the current research was aimed to compare photosynthetic responses of Anthurium × ‘Red’ leaves at different positions (bottom old leaf, 1; center mature leaf, 2; top expanded leaf, 3) established under three photosynthetic photon flux densities (PPFDs): 550 μmol·m−2·s−1 as high (H), 350 μmol·m−2·s−1 as medium (M), and 255 μmol·m−2·s−1 as low (L). After six months, all the replicates were relocated to interior rooms with a PPFD of 30 μmol·m−2·s−1. There were no significant differences in chlorophyll concentration of the old leaf among treatments, before (Day 0) and after shifting the plants to interior rooms (Day 30). The total chlorophyll concentrations of the mature and top leaves increased significantly. In greenhouse conditions, H and M treatments did not show any significant change for net photosynthetic rate (Pn) at various leaf positions. However, M2 exhibited an improved Pn in the interior conditions. Plants grown under M treatment were greener and had bigger leaves compared to other treatments. Our study reveals that Anthurium × ‘Red’ photosynthesis responses to different light conditions varied distinctly. However, M treatment can keep the plants looking green by accumulating enough energy for indoor conditions, and middle and lower leaves may be triggered to restore photosynthetic activity under low light or indoor conditions.
Highlights
Shading is widely employed during the growth of plants, plants with ornamental foliage to prevent damage triggered by high light intensity [1,2]
The plants with a high photosynthesis ability under low light or shade conditions acclimate naturally to survive by decreasing their light compensation points and increasing leaf size and chlorophyll contents [7,8]
The photosynthetic rate (Pn) was not significantly influenced in different months at the same leaf positions for the plants established under H treatment
Summary
Shading is widely employed during the growth of plants, plants with ornamental foliage to prevent damage triggered by high light intensity [1,2]. Growers apply shades to foliage or shade plants by covering the shutter or using a whitewash on the greenhouse cover to avoid direct exposure under high light conditions. Plants that are exposed to a specific irradiance are mostly adapted to this light environment [6]. Plants exhibit notable adaptability and plasticity to varying light conditions by modifying their photosynthetic apparatus and morphological traits [5]. Foliage plants are exposed to low-light environments for a long time after being sold [1]. The plants with a high photosynthesis ability under low light or shade conditions acclimate naturally to survive by decreasing their light compensation points and increasing leaf size and chlorophyll contents [7,8]
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