The effects of carbon dioxide concentrations on some morphological and physiological characteristics of ligustrum vulgare

Abstract

<span style="font-family: Calibri;"><span lang="EN-MY"><span style="font-size: medium;">Carbon dioxide is one of the most important necessary factors for plant growth. In order to study morphological and physiological response of <em>ligustrum vulgare</em> to Co</span>_{<span style="font-size: small;">2</span>}<span style="font-size: medium;"> enrichment, one-year-old seedlings of this species exposed to different carbon dioxide concentrations for two months.<span> </span>Treatments included 450 (control), 750, and 1100 ppm Co</span>_{<span style="font-size: small;">2</span>}<span style="font-size: medium;">. The experiment was based on a completely randomized design with three replications. Then some morphological and physiological characteristics were measured. Results showed Co</span>_{<span style="font-size: small;">2</span>}<span style="font-size: medium;"> concentrations of 750 and 1100 ppm increased all morphological traits (except collar diameter and root dry weight) and physiological characteristics such as proline, chlorophyll a and nitrogen. The highest amounts of proline, chlorophyll a and nitrogen were observed at concentration of 750 ppm. The amount of increase in proline was about 4-fold compared to the control. The study </span></span><span style="font-size: medium;"><span lang="EN-MY">concludes that</span><span lang="EN-MY"> the </span><span lang="EN-AU">increased carbon dioxide concentration in the future maybe improve the </span><span lang="EN-MY">growth</span><span lang="EN-AU"> of this plant.</span></span></span>