Abstract
Conocarpus lancifolius is a perennial ornamental plant adapted to the semi-arid conditions of Kuwait. It accumulates most of its biomass during the stressful summer conditions which includes UV-B irradiation. The study evaluated equivalent UV-B irradiation intensities that plants would normally experience sometime during the course of a year in Kuwait. Leaf area, plant height, photosynthetic parameters, Lipid Peroxidation (LP) and Phenyl Alanine Lyase (PAL) were measured in C. lancifolius plants exposed to different UV-B treatments. UV-B treatments decreased leaf area and plant height but induced the formation of lateral branches. Chlorophyll content, photosynthesis, chlorophyll fluorescence measured as maximum quantum efficiency of photosystem II (Fv/Fm) and Electron Transport Rate (ETR) decreased in the short term or the first 10-20 days after treatment. Lipid Peroxidation (LP) measured in terms of Malondiadehyde (MDA) content decreased in the long term after a short term increase but Phenyl Alanine Lyase (PAL) activity increased linearly by 41.2, 66.8 and 78.6% after 30 days. There was also Positive Linear Correlation between UV-B dosage and total flavonoid accumulation which was localized in epidermal cell walls, trichomes and cuticular layer. The response of C. lancifolius to ameliorate and/or tolerate UV-B stress involved multiple mechanisms that included increased concentrations of PAL activity, increased flavonoids production; and reduced lipid peroxidation. The net effect of flavonoid accumulation and PAL enzyme activity probably contributed significantly to the protection or tolerance of the species to the effects of UV-B.
Highlights
Conocarpus lancifolius is a perennial ornamental plant adapted to the semi-arid conditions of Kuwait
Chlorophyll content was significantly reduced in UVB treatments after 5 days and plants at 2.0 Wm−2 UV-B had the least Chlorophyll Content Index (CCI) (Table 2)
After linear rate of decline for the 10-15 days, photosynthesis increased in UV-B treated plants but the values were still lower than the control
Summary
Conocarpus lancifolius is a perennial ornamental plant adapted to the semi-arid conditions of Kuwait It accumulates most of its biomass during the stressful summer conditions which includes UV-B irradiation. Plant height, photosynthetic parameters, Lipid Peroxidation (LP) and Phenyl Alanine Lyase (PAL) were measured in C. lancifolius plants exposed to different UV-B treatments. Conocarpus lancifolius was introduced into Kuwait as an ornamental plant It accumulates most of its biomass during the stressful summer environmental conditions including UV-B radiation. The objective of this study was to evaluate changes in some growth traits, chlorophyll content, chlorophyll fluorescence (maximum quantum efficiency of photosystem II (Fv/Fm) and Electron Transport Rate (ETR), photosynthetic rate, lipid peroxidation and Phenyl Alanine Lyase (PAL) activity in C. lancifolius after exposure to UV-B radiation treatments
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