Apple Leaves, Their Morphology And Photosynthetic Potential1

in HortScience
John A. BardenDepartment of Horticulture, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

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There has recently been a resurgence in interest in the photosynthetic efficiency of apple (Malus domestica Borkh.) trees. During the 1930’s and early 1940’s several papers were published relating to leaf morphology and the effects of various factors such as water relations, nutrition, and pesticides on net photosynthesis (Pn) of apple leaves. From the mid 1940’s until the mid 1960’s little relevant research was published. Renewed emphasis began to be apparent by the mid 1960’s, partially as the result of greatly improved equipment, particularly the infrared gas analyzer (IRGA). This discussion is devoted to the maximum net photo synthetic potential of apple leaves, the factors which have been shown to influence it, and areas which need further research if we are to fully exploit the inherent capability for CO2 fixation.

Contributor Notes

Received for publication February 28, 1978.

The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper must therefore be hereby marked advertisement solely to indicate this fact.

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