THE EFFECT OF 3‐AMINO‐1,2,4‐TRIAZOLE ON THE ULTRASTRUCTURE OF PLASTIDS OF TRITICUM VULGARE SEEDLINGS

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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.
Funding Information
  • National Science Foundation (GB‐6542)