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Plant Physiology 49:826-835 (1972)
© 1972 American Society of Plant Biologists

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Articles

Changes in Mitochondrial Properties Associated with Chloroplast Development in Jack Bean (Canavalia ensiformis [L] DC.) 1

Don P. Bourque2 and Aubrey W. Naylor

a Department of Botany, Duke University, Durham, North Carolina 27706

Procedures were developed to isolate actively respiring mitochondria from jack bean (Canavalia ensiformis [L.] DC.) leaves and cotyledons. Consistent respiratory control values of about 2 for succinate oxidation were obtained in preparations from etiolated cotyledons. Jack bean mitochondria oxidized malate with high respiratory control (2 to 5) and ADP/O (up to 2.8).

Mitochondria purified from greening leaves and cotyledons exhibited rapid increases in respiratory control for up to 4 hours of light exposure followed by a decrease in activity. ADP/O values remained constant at about 1.2 while oxygen consumption per unit mitochondrial protein increased constantly during the first 14 hours of greening in preparations from cotyledons. The changes in mitochondrial respiratory activity during greening were correlated with the reversible appearance of mitochondria in the condensed conformation observed by electron microscopy. Both isolated mitochondrial pellets and cotyledon mitochondria in situ were shown to exhibit these changes in conformation during greening.

2 Present address: Department of Botanical Sciences, University of California at Los Angeles, Los Angeles, Calif. 90024.

1 This work was supported by grants from the Herman Frasch Foundation, National Science Foundation Grants GB-5043 to A.W.N. and GB-7153 to the Southeastern Plant Environment Laboratories.






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Copyright © 1972 by the American Society of Plant Biologists