Acta Botanica Croatica, Vol. 32 No. 1, 1973.
Original scientific paper
Changes of Photosynthetic Activity of Plastids During Their Transformations
Zdenka Dvojković-Penava
; Hrvatska
Abstract
The photosyntetic activity of tissues with transforming plastids has been measured by means of a Warburg apparatus. At the same time the chlorophyll content of the tissue has been determined by spetropho- tometric measurements of ethanolic extracts. The data obtained are compared with electron microscopic findings of ultrastructural changes in plastids of the corresponding developmental stages. The investigations have given the following results:
1) During the transformation of chloroplasts into chromoplasts the photosynthetic activity ceases simultaneously with the disappearance of chlorophyll.
2) Fully developed chromoplasts never contain chlorophyll and never show any photosynthetic activity.
3) The regreening chromoplasts regain their photosynthetic activity simultaneously with the reappearance of chlorophyll.
4) The presence of chlorophyll and the existence of photosynthetic activity appear to be closely correlated with the appearance of grana.
Keywords
Hrčak ID:
157250
URI
Publication date:
31.12.1973.
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