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PLANT PHYSIOLOGY , Vol 107, Issue 3 925-932, Copyright © 1995 by American Society of Plant Biologists
Developmental Regulation of Respiratory Activity in Pea Leaves
A. M. Lennon, J. Pratt, G. Leach and A. L. Moore
Biochemistry Department, University of Sussex, Falmer, Brighton BN1 9QG, United Kingdom
The developmental pattern of mitochondrial respiratory activity in pea
(Pisum sativum) leaves has been investigated in an attempt to determine
changes in mitochondrial function as plant cells mature. NADH and succinate
dehydrogenase and cytochrome c oxidase activities remained relatively
constant during cell maturation (from d 0 to d 14). Alternative oxidase and
glycine decarboxylase activity, however, were low in young leaf tissue (d
0-6) but increased substantially as the tissue matured (d 7-14) and gained
photorespiratory activity. Western blot analysis of the alternative oxidase
protein revealed that it was primarily in an oxidized state in young leaves
(d 0-6) but switched dramatically to the reduced form of the protein as the
pea cells matured (d 7-14). The switch to the reduced form of the protein
correlated with an increase in alternative oxidase activity. Results are
discussed in terms of the changing function of plant mitochondria during
leaf development.
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