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THE PLANT CELL, Vol 4, Issue 4 425-433, Copyright © 1992 by American Society of Plant Biologists

RESEARCH ARTICLES

A Carrot Somatic Embryo Mutant Is Rescued by Chitinase

A. J. De Jong, J. Cordewener, F. L. Schiavo, M. Terzi, J. Vandekerckhove, A. Van Kammen and S. C. De Vries
Department of Molecular Biology, Agricultural University of Wageningen, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands

At the nonpermissive temperature, somatic embryogenesis of the temperature-sensitive (ts) carrot cell mutant ts11 does not proceed beyond the globular stage. This developmental arrest can be lifted by the addition of proteins secreted by wild-type cells to the culture medium. From this mixture of secreted proteins, a 32-kD glycoprotein, designated extracellular protein 3 (EP3), that allows completion of somatic embryo development in ts11 at the nonpermissive temperature was purified. On the basis of peptide sequences and biochemical characterization, EP3 was identified as a glycosylated acidic endochitinase. The addition of the 32-kD endochitinase to ts11 embryo cultures at the nonpermissive temperature appeared to promote the formation of a correctly formed embryo protoderm. These results imply that a glycosylated acidic endochitinase has an important function in early plant somatic embryo development.


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