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Journal of Experimental Botany, Vol. 52, No. 362, pp. 1741-1752, September 1, 2001
© 2001 Oxford University Press

Review Article

Stored proteinases and the initiation of storage protein mobilization in seeds during germination and seedling growth

K. Müntz1,3, M.A. Belozersky2, Y.E. Dunaevsky2, A. Schlereth1 and J. Tiedemann1

1 Institut für Pflanzengenetik und Kulturpflanzenforschung (IPK), Corrensstr. 3, D-06466 Gatersleben, Germany
2 A.N. Belozersky Institute of Physico-Chemical Biology, Building A, Moscow State University, 119899, Moscow, Russia

Though endopeptidases and carboxypeptidases are present in protein bodies of dry quiescent seeds the function of these proteases during germination is still a matter of debate. In some plants it was demonstrated that endopeptidases of dry protein bodies degrade storage proteins of these organelles. Other studies describe cases where this did not happen. The role that stored proteinases play in the initiation of storage protein breakdown in germinating seeds thus remains unclear. Numerous reviews state that the initiation of reserve protein mobilization is attributed to de novo formed endopeptidases which together with stored carboxypeptidases degrade the bulk of proteins in storage organs and tissues after seeds have germinated. The evidence that the small amounts of endopeptidases in protein bodies of embryonic axes and cotyledons of dry seeds from dicotyledonous plants play an important role in the initiation of storage protein mobilization during early germination is summarized here.

Key words: Dicotyledonous seeds, germination, protein bodies, protein mobilization, stored proteases.


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