Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Physiologia plantarum
32 (1974), S. 0
ISSN:
1399-3054
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Biology
Notes:
Adenosine triphosphatase activity of tobacco leaf chloroplasts in the dark was measured, using leaves of different age as determined by the position of the leaves along the stem. The activity of the chloroplast preparations strongly decreased with age, regardless of the addition of Mg2+ or Ca2+. Opposite effects of Mg2+ and Ca2+ on the activity of the chloroplasts were noted in experiments where different ratios of Mg2+/Ca2+ were applied. They were related to the age of the leaves, Ca2+ strongly stimulated the activity of the preparations from old leaves but was practically without effect in young, just expanded leaves. Mg2+ slightly stimulated the activity from old leaves while it invariably inhibited the hydrolytic activity of preparations from young leaves.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1399-3054.1974.tb03750.x
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