Abstract
Rice (Oryza sativa L. cv. Safari) plants were grown over a 30-day period in nutrient solutions containing 0.002–1.25 mg l−1 Cu concentrations. It was found that increasing Cu concentrations led to increasing Cu contents in the plant’s shoot and to an inhibition of its growth. Transmission electron microscopy showed no obvious ultrastructural changes in the shoot tissues, except for electron-dense deposits adherent to the tonoplast, appearing from the 0.25 mg l−1 Cu treatment onwards. On a protein basis, Cu and SH groups concentrations in isolated shoot vacuoles increased by 41% and 120%, respectively, from the 0.01 to the 1.25 mg l−1 Cu treatments. In spite of increased vacuolar Cu contents, the activities of NADH-cytochrome c reductase and acid phosphatase were not inhibited, apparently because of metal binding to sulphydryl groups contained in the vacuole.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: 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.