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Ultrastructural Effects of Water Stress on Chloroplast Development in Jack Bean (Canavalia ensiformis [L.] DC) ¹

^a Department of Botany and Department of Microbiology and Immunology, Duke University, Durham, North Carolina 27706

An ultrastructural study has been made to determine to what degree chloroplast differentiation is retarded in leaves of young jack bean (Canavalia ensiformis [L.] DC.) seedlings when they are subjected to mild water stress. Rapid chloroplast differentiation occurred when etiolated seedlings were allowed to green at relative humidities above 85% but not at a relative humidity of 25%. Response to a drop in humidity was rapid. Germination and early development in the dark occurred at 100% relative humidity. At the time of exposure to light, the etioplasts contained well formed prolamellar bodies. Under high relative humidity conditions, transformation of the prolamellar body was well advanced within 2 hours. Under low relative humidity conditions, however, prolamellar body differentiation was extremely retarded for more than 24 hours following the beginning of illumination.

¹ A portion of this work was reported at the meetings of the Southern Section of the American Society of Plant Physiologists: Bourque, D. P., P. N. McMillan, W. J. Clingenpeel and A. W. Naylor. 1971. Effect of chloroplast development in jack bean (Canavalia ensiformis [L.] DC.) of water stress and inhibitors of protein and nucleic acid synthesis. Proc. Assoc. Southern Agricultural Workers 68: 202-203. This study was supported in part by grants from the Herman Frasch Foundation and the National Science Foundation (NSF-GB-5043) to Aubrey W. Naylor and National Science Foundation Grant GB-7153 to the Southeastern Plant Environment Laboratories.

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