This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Popovic, R. Articles by Leblanc, R. M. Search for Related Content PubMed PubMed Citation Articles by Popovic, R. Articles by Leblanc, R. M. Agricola Articles by Popovic, R. Articles by Leblanc, R. M.

Membranes and Bioenergetics

Study of Energy Storage Processes in Bundle Sheath Cells of Zea mays¹

Centre de recherche en photobiophysique, Université du Québec à Trois-Rivières, C.P. 500, Trois-Rivières (Quèbec) G9A 5H7, Canada

Photochemical energy storage in isolated bundle sheath cells from Zea mays was examined. Photoacoustic spectroscopy was used in this study to monitor energy storage processes. The presence of methyl viologen or addition of substrates which activated carbon fixation, prevented energy storage processes through the electron transport system. The energy storage was inhibited completely by dibromothymoquinone (DBMIB) and DCMU, inhibitors of noncyclic electron flow. However, the reductants such as dithiothreitol and ascorbate increased the energy storage. It was concluded that photosystem (PS) I may be reduced by some electron donor(s) other than water and that PSII only partially participates in PSI reduction. It is postulated that the role of PSII is to regulate PSI electron transport and prevent its overoxidation. In the presence of high level of malate, photoacoustic spectroscopy indicated a low energy storage which may be due to induction of energy utilization in carbon assimilation.

¹ Supported by the Natural Sciences and Engineering Research council of Canada through grants A4047 and A6358.