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The Fine Structure of Chloroplasts from Mineral-Deficient Leaves of Phaseolus vulgaris

William W. Thomson and T. E. Weier
American Journal of Botany
Vol. 49, No. 10 (Nov. - Dec., 1962), pp. 1047-1055
Stable URL: http://www.jstor.org/stable/2439150
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Fine Structure of Chloroplasts from Mineral-Deficient Leaves of Phaseolus vulgaris
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Abstract

An electron microscopic study of the changes in chloroplast structure as affected by the stress of nutrient deficiencies is described. Each deficiency produces characteristic changes in the ultrastructure of the chloroplast. In phosphorus and potassium deficiency the plastids develop fully before changes occur; then the grana break down into diffuse, electron-dense masses, forming a highly ordered lamellar system. The plastids of plants low in nitrogen and magnesium do not reach full development before changes occur. In nitrogen-deficient plastids, the stroma is greatly diminished and the grana compartments are swollen and reduced in number. In magnesium deficiency, the grana-fretwork system becomes disorganized and many star-bodies are formed. The absence of zinc blocks the full development of a grana-fretwork system, and large vacuoles are formed in conjunction with grana compartments.

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