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Plant Physiology 54:231-237 (1974)
© 1974 American Society of Plant Biologists

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Articles

Role of Mitochondria in the Origin of Chloroplast Starch Grains

Description of the Phenomenon 1,2

S. G. Wildman, Charlene Jope and B. A. Atchison3

a Department of Biology, Molecular Biology Institute, University of California, Los Angeles, California 94720

By phase microscopic observation of living palisade parenchyma cells in sections of Nicotiana excelsior leaves from plants previously placed in the dark for 72 hours, 30 to 45 minutes of light is found to induce mitochondria to remain stationary within the concavity of the chloroplasts and become round. Extending the illumination period to 60 to 90 minutes causes the stationary mitochondria in the concavity to change from a translucent to an opaque appearance, the change coinciding with the first appearance of starch as detected by blue staining of the grains with I2-KI. It is speculated that an interaction bearing some resemblance to the previously described interaction between mitochondria and the mobile phase of the chloroplasts may also operate in the starch grain phenomenon.

3 Present address: Division of Plant Industry, CSIRO, Canberra, Australia.

1 Research was supported by the National Institutes of Health Research Grant AI00536 and United States Atomic Energy Commission Contract AT(04-3)-11, Project 8.

2 This paper is dedicated to the memory of Solon A. Gordon who shared a laboratory with S. G. W. as graduate students at the University of Michigan from 1939-1942 where they collaborated in research dealing with auxins and leaf proteins. This was the happy beginning of what has developed into the dominant theme of S. G. W.'s research efforts.






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Copyright © 1974 by the American Society of Plant Biologists