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Plant Physiology 98:984-987 (1992)
© 1992 American Society of Plant Biologists

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Metabolism and Enzymology

Differential Carbon Monoxide Sensitivity of Cytochrome c Oxidase in the Leaves of C3 and C4 Plants 1

Rajeev M. Naik, Ashok R. Dhage, Shivaji V. Munjal, Prikshayat Singh2, Babasaheb B. Desai, Shanti L. Mehta2 and Manohar S. Naik

Department of Biochemistry, Mahatma Phule Agricultural University, Rahuri, India 413 722

CO sensitivity of cytochrome a3 in the leaves of a number of C3 and C4 plants was monitored by the nitrate reductase assay under differing CO to O2 ratios. All the C3 plants were relatively insensitive to CO and required a high CO to O2 ratio of 40 to promote significant nitrate reductase activity. However, when treated with 2 millimolar 2,4-dinitrophenol, these leaves readily responded to CO even at low CO to O2 ratios of 10 or less. On the other hand, the leaves of all C4 plants tested, belonging to the three subgroups, were highly sensitive to CO, even at CO to O2 ratios of 5 or less. In these leaves, the uncoupler was without any effect, probably because the mitochondria, either from mesophyll or bundle sheath cells or both, lacked tight respiratory control.

2 Present address: Biochemistry Division, Indian Agricultural Research Institute, New Delhi, India 110 012.

1 Project financed by the Indian Council of Agricultural Research.






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Copyright © 1992 by the American Society of Plant Biologists