THE EFFECT OF 3-AMINO-1,2,4-TRIAZOLE ON THE ULTRASTRUCTURE OF PLASTIDS OF TRITICUM VULGARE SEEDLINGS |
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Authors: | Paul G Bartels T E Weier |
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Institution: | Department of Botany, University of California, Davis |
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Abstract: | The application of sublethal doses of 3-amino-1,2,4-triazole (AT) to germinating, light-grown wheat grains causes chlorosis of the resulting leaves. An ultrastructural examination of the leaf tissue reveals that the plastids lack normal grana-fret membrane systems and chloroplast ribosomes. A few disorganized membranes are always present in these chloroplasts. However, AT-treated, dark-grown seedlings contain proplastids with non-crystalline prolamellar bodies and ribosomes. When these etiolated, treated plants are exposed to 600 ft-c light for various periods of time, the proplastids fail to develop into normal, grana-containing chloroplasts. |
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