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Plant and Cell Physiology, 1973, Vol. 14, No. 5 965-971
© 1973

Article

Changes in mitochondrial activity during enlargement of mung bean root cells

Yasuhito Tanaka and Tadashi Asahi

Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University Nagoya, Japan

A mitochondrial fraction was separately prepared from two different regions of mung bean roots; from root-tips which contained mainly immature cells and from tissue, other than the root-tips, which was composed of mature and fully vacuolated cells. The malate dehydrogenase, fumarase and aconitase activities per cell did not increase or did so only slightly during cell growth. Respiratory activity of both tissue sections and the crude mitochondrial fraction also seemed to increase slightly as cells matured. However, the cytochrome oxidase and succinate cytochrome c reductase activities per cell increased significantly during cell enlargement. There was no difference in the distribution-profiles of the cytochrome oxidase and malate dehydrogenase activities after sucrose density gradient centrifugation, between mitochondrial fractions prepared from two regions of the. roots. The malate dehydrogenase activity per unit of cytochrome oxidase activity in purified mitochondria of immature cells was much higher than that of mature cells. The results suggest that enzymes in mitochondrial matrix are mainly synthesized in immature cells or during cell division. In contrast, enzymes in the cristae seem to be formed during cell maturation, as well as being formed in immature cells.

(Received January 26, 1973; )
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