Internal structure and photosynthetic activity of different leaves of apple

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Abstract
Studies were made of morphological and physiological characteristics of leaves developed on two different types of fruiting shoot of apple, namely long terminal extensions and spurs borne on 5–7-year-old spur systems. Leaves of the long shoots had more highly developed palisade parenchyma, better light absorbing capacity and higher rates of photosynthesis than the spur leaves. The chlorophyll content of the leaves was apparently correlated with leaf thickness, and the time of maximum accumulation of chlorophyll coincided with the time when fruit buds differentiated at the shoot apices. The presence of fruits stimulated photosynthetic activity of the leaves.

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