Plant Physiol.
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Plant Physiology 42:1229-1238 (1967)
© 1967 American Society of Plant Biologists

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Articles

Structure and Function of Tomato Leaf Chloroplasts During Ammonium Toxicity 1

George S. Puritch2 and Allen V. Barker

Department of Plant and Soil Sciences, University of Massachusetts, Amherst, Massachusetts

Ammonium toxicity resulted in morphological modifications of tomato leaf chloroplasts. The chloroplasts, which are normally flattened around the protoplast periphery, became ellipsoidally rounded and dispersed through the protoplasm. The first apparent effect of plastid degradation was development of many vesicles from the fretwork. Later the grana lamellae swelled, and some disappeared. Eventually, distinct grana could not be detected.

Ammonium accumulation, chlorophyll loss, and photosynthetic decrease occurred simultaneously. Initial changes in these processes preceded the detection of modifications of fine structure; however, each continued with further breakdown of the chloroplasts.

2 Present address: Department of Forestry and Rural Development, Forest Research Laboratory, Victoria, B.C., Canada.

1 Part of a thesis submitted by the senior author to the University of Massachusetts in partial fulfillment of the requirements for the M.S. degree, September, 1966.




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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1967 by the American Society of Plant Biologists