Assessment of impact of solar UV components on growth and antioxidant enzyme activity in cotton plant

Abstract

A field experiment was conducted to study the impact of solar UV-B (280-315 nm) and UV-A (315-400 nm) components on the growth and antioxidant enzyme activity in cotton plant (Gossypium hirsutum var. Vikram). Solar UV components were excluded by filtering the sunlight through selective UV-B (<315 nm) and UV-B/A (<400 nm) absorbing polyester films. Plants grown under filters that transmitted solar UV served as controls. Exclusion of UV-B and UV-B/A enhanced plant height, leaf area and total biomass of plants. The activity of antioxidant enzymes superoxide dismutase (SOD), ascorbic acid peroxidase (APX), glutathione reductase (GR) and guaiacol peroxidase (GPx) assayed in the leaves were lesser in the UV excluded plants. The level of ascorbic acid and UV absorbing substances were also decreased by the exclusion of UV. Solar UV components exerted a limitation on the potential growth of cotton plants. Reduction in the antioxidant enzyme activity and ascorbic acid after UV exclusion indicated that ambient UV components exert a significant stress on cotton plants. Reduction in the production of UAS indicated a changed pattern of metabolism leading to improved primary metabolism. Exclusion of UV components is advantageous from the agricultural point to enhance the growth of cotton plants.

Morphological Traits Underlying Differences in Early Vigor among Four Cotton Genotypes

“…In particular, differences in light intensity between the two environments likely influenced the relative contributions of NAR and SLA to RGR. Additional differences in environmental conditions such as the influence of wind (Baker et al, 2009), the effect of ultraviolet light (Dehariya et al, 2011), and the need for investment in defense-related metabolites (Olson et al, 2008;Nix et al, 2017) are also known to influence plant growth and could have contributed to the differences observed between the greenhouse and field conditions. In previous studies, similar results were found in that RGR differences were ascribed only to NAR (Eagles, 1967;Pons, 1977), only to LAR (Higgs and James, 1969;Dijkstra, 1989;Smeets and Garretsen, 1986), or to both NAR and LAR together (Jarvis and Jarvis, 1964;Corrẽ, 1983).…”

“…Loveys et al (2002) studied 16 different plant species including trees, shrubs, grasses, and forbs and reported that under moderate (23°C) or high temperatures (28°C), SLA was the most important factor affecting RGR, whereas at lower temperature (18°C), NAR was the more important determinant of RGR. Additional differences in environmental conditions such as the influence of wind (Baker et al, 2009), the effect of ultraviolet light (Dehariya et al, 2011), and the need for investment in defense-related metabolites (Olson et al, 2008;Nix et al, 2017) are also known to influence plant growth and could have contributed to the differences observed between the greenhouse and field conditions. Additional research would be necessary to ascertain the reasons underlying the environmental effects observed in the present study.…”

Regulation of growth and development in phytochrome mutants of Arabidopsis thaliana by solar UV

“…Suppression of leaf growth by solar UV and a drastic enhancement in the area of leaves after the exclusion of UV has been observed in plants such as cotton (Dehriya et al 2011) and Amaranthus (Sharma and Guruprasad 2009). The number and the area of rosette leaves were enhanced by the exclusion of UV in WT Arabidopsis also.…”

UV-B Photoreceptors, Their Role in Photosignaling, Physiological Responses, and Abiotic Stress in Plants

“…Exposure to UV-B has a number of detrimental effects on plants, notably, alterations in plant morphology, growth, and development such as reduction in leaf area, reduced stem growth (Cuadra et al 2004 ;Dehariya et al 2011 ;Frohnmeyer and Staiger 2003 ), decreased fl owering, and alteration in the timing of fl owering in certain species of plants. However, variations are seen in the morphological parameters depending on the plant variety and exposure time (Sakalauskaite et al 2013 ).…”