In belladonna leaves, as well as in tobacco (AVERY 1933), there are cell differentiation gradients. One is along the major leaf-axis, and another from the midrib towards the leaf margin. Moreover, in both leaf laminae there are seven cell layers. In the least differentiated regions of the youngest leaves all cell layers show plastids with a membrane-bound body. As mesophyll differentiates, the frequency of such plastids decreases and, at the same time, their distr:bution in the different cell layers varies. According to our surveys, carried out into successively older leaves, we can assume that the plastid differentiation speed is not determined y light as much as by the cell’s internal environment. © 1977 Taylor and Francis Group, LLC.
Relationship between plastids with a membrane-bound body and cell differentiation gradients in Belladonna.
CASADORO, GIORGIO;RASCIO, NICOLETTA
1977
Abstract
In belladonna leaves, as well as in tobacco (AVERY 1933), there are cell differentiation gradients. One is along the major leaf-axis, and another from the midrib towards the leaf margin. Moreover, in both leaf laminae there are seven cell layers. In the least differentiated regions of the youngest leaves all cell layers show plastids with a membrane-bound body. As mesophyll differentiates, the frequency of such plastids decreases and, at the same time, their distr:bution in the different cell layers varies. According to our surveys, carried out into successively older leaves, we can assume that the plastid differentiation speed is not determined y light as much as by the cell’s internal environment. © 1977 Taylor and Francis Group, LLC.
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