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 HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Pongratz, P. Articles by Beck, E. Search for Related Content PubMed PubMed Citation Articles by Pongratz, P. Articles by Beck, E. Agricola Articles by Pongratz, P. Articles by Beck, E.

Articles

Diurnal Oscillation of Amylolytic Activity in Spinach Chloroplasts

Lehrstuhl Pflanzenphysiologie, Universität Bayreuth, Am Birkengut, D-8580 Bayreuth, West Germany

Chloroplasts isolated from spinach (Spinacia oleracea L., cv. vital^R) plants grown under controlled light/dark and temperature regimes, contained the phosphorolytic and amylolytic pathways for starch breakdown. The latter consists at least of - and -amylase and maltase. Only low amylolytic activity was observed in chloroplasts isolated during the light phase. In chloroplasts prepared during the dark phase, this activity was almost twice as high. These diurnal oscillations of the amylolytic activity were maintained when the plants were kept in prolonged darkness or continuous light. The amylolytic system exhibited a sharp pH optimum between 5.8 and 6.0. Phosphorylase activity, when assayed with saturating concentrations of inorganic phosphate, did not show diurnal fluctuations.

This article has been cited by other articles:

				I. J. Tetlow, M. K. Morell, and M. J. Emes Recent developments in understanding the regulation of starch metabolism in higher plants J. Exp. Bot., October 1, 2004; 55(406): 2131 - 2145. [Abstract] [Full Text] [PDF]

				J. Schleucher, P. J. Vanderveer, and T. D. Sharkey Export of Carbon from Chloroplasts at Night Plant Physiology, December 1, 1998; 118(4): 1439 - 1445. [Abstract] [Full Text]