Development of Mitochondrial Activities in Pea Cotyledons during and following Germination of the Axis

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Abstract
Development of mitochondrial activities in pea [P. sativum L. cv. Alaska] cotyledons during early times after the start of imbibition occurred in 2 phases. In the 1st phase (0-8 h after the start of imbibition), succinate or NADH oxidation increased rapidly, while malate or .alpha.-ketoglutarate oxidation remained low. The latter activities developed only 8-12 h after the start of imbibition (the 2nd phase). Development in the 1st phase was induced by water uptake, but some development occurred even when the cotyledons were fully imbibed. The presence of the axis was required for the 2nd phase of the development. Mitochondrial development in the 2nd phase is brought about by activation of the electron transfer path at a site between the oxidation of endogenous NADH and the reduction of ubiquinone.