Abstract
Bush bean ( Phaseolus vulgaris L. cv. Rintintin) plants were exposed 34 days for 8 h day -1 to three levels of ozone (7, 62 and 111 ppb) in open-top chambers. During anthesis concentrations of amino acids, polyamines and soluble protein as well as the activity of the enzyme glutamine synthetase were measured in leaves in order to investigate the effect of chronic ozone stress on characteristics of nitrogen metabolism. Protein content and enzyme activity of glutamine synthetase were both shown to decrease with increasing ozone concentrations. Spermidine was elevated at the highest ozone level. Analysis of amino acids yielded similar results showing a significant increase of total amino acids at the highest treatment level. This was associated with an increase of the concentrations of the individual amino acids glutamate, glutamine, alanine, threonine and, especially, asparagine. At the intermediate ozone level only the concentration of glutamate was found to be higher.
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.
