Acta Botanica Croatica, Vol. 35 No. 1, 1976.
Original scientific paper
Ultrastructural and Functional Characteristics of Plastids in the Leaves of Ligustrum ovalifolium Hassk. var. aureum
Mercedes Wrischer
; Hrvatska
Nikola Ljubešić
; Hrvatska
Zvonimir Devidé
; Hrvatska
Abstract
The leaves of Ligustrum ovalifolium Hassk. var. aureum, which are for a long time exposed to strong sunlight, do not green, but turn yellow. In these yellow leaves the plastids have a very reduced thylakoid system consisting of single thylakoids, vesicles, and membrane coils, and contain very few grana. Leaves grown in the shade are, on the contrary, more or less green and their plastids posess large grana. Morphometric
measurements show that the plastids of yellow leaves contain only 11% of grana thylakoids present in plastids of green leaves.
While in yellow leaves the concentration of pigments, especially of chlorophylls, is very low (4.78% of that in green leaves), their photosynthetic activity (calculated to the chlorophyll content) is more than 5 times higher than in green leaves.
Keywords
Hrčak ID:
158064
URI
Publication date:
31.12.1976.
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