Abstract
<p>In order to evaluate the effect of CO<sub>2</sub> elevation and UV radiation on growth responses of zinnia, petunia, coxcomb, and marigold, a study was conducted in 2015 at Arsanjan Islamic Azad University, Iran. The experimental design was factorial arranged in completely randomized design with three replications. Treatments were included four ornamental species (zinnia, petunia, coxcomb, and marigold), CO<sub>2</sub> concentration at two levels (350 and 700 ppm), and UV radiation at two levels (with and without UV radiation). Results showed that elevating of CO<sub>2</sub> concentration from 350 ppm to 700 ppm increased morphological and physiological characters of C<sub>3</sub> plants, especially marigold. Meanwhile, increasing CO<sub>2</sub> concentration from 350 ppm to 700 ppm, decreased effects of UV damage on plants’ morphological and physiological characters. The highest leaf number, shoot dry mass, plant height and water use efficiency of C<sub>4</sub> plant (coxcomb flower) were observed at 350 ppm of CO<sub>2</sub> concentration without UV radiation while, the highest leaf number, shoot dry mass and leaf pigments of C<sub>3</sub> plants (zinnia, petunia, and marigold flower) were obtained at 700 ppm of CO<sub>2</sub> concentration without UV radiation. The results showed that the activity of catalase and peroxidase enzymes under UV radiation was increased in all of plants. Overall, it is concluded that, the recognition of plants resistant to UV radiation and high levels of CO<sub>2</sub> concentration in the future may be better for environmental production and distribution as ornamental plants in town landscapes, where ecophysiological traits should be considered.</p>
Highlights
Nowadays, unstable symptoms on the Earth such as environmental pollution and species extinction caused by increased emissions of greenhouse gases, in combination with changes in solar radiations intensity appeared to be unavoidable (Xing, 2009; Ziska and Blumenthal, 2010)
Morphological traits and physiological processes of plants are affected by different climate change aspects such as CO2 elevation, high temperature, ultra violet (UV) radiation, and quantity and dispersal of rainfall (Fuhrer, 2003)
By considering the climatic changes the objective of this research was to determine the influence of CO2 elevation and UV-A radiation on morphological and physiological properties of zinnia, petunia, coxcomb, and marigold
Summary
Unstable symptoms on the Earth such as environmental pollution and species extinction caused by increased emissions of greenhouse gases, in combination with changes in solar radiations intensity appeared to be unavoidable (Xing, 2009; Ziska and Blumenthal, 2010). Morphological traits and physiological processes of plants are affected by different climate change aspects such as CO2 elevation, high temperature, ultra violet (UV) radiation, and quantity and dispersal of rainfall (Fuhrer, 2003). It is reported that climate changes has affected flowering initiation, physiology, water relations, ions absorption, photosynthesis and respiration of plants (Mortensen, 1987). CO2 elevation could increase net photosynthesis of potted plants, cut flowers, and vegetables (Croonenborghs et al, 2009). Kamali et al (2011) reported that CO2 elevation from 380 to 1050 ppm could increase shoot and root dry mass, height, number of leaves and leaf area of coxcomb (Celosia argentea L.). Shoor et al (2010) showed that increasing CO2 level to 700 ppm could accelerate marigold (Tagetes patula L.) flowering time
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
