Plant Physiol.
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Plant Physiology 63:1198-1204 (1979)
© 1979 American Society of Plant Biologists

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Articles

Developmental Expression of Genetically Defined Peptidases in Maize 1

Lila O. Vodkin2 and John G. Scandalios3

a Department of Genetics, North Carolina State University, Raleigh, North Carolina 27650

The activities of genetically defined amino- and endopeptidases of maize were compared in pericarp, endosperm, and embryonic tissue of the maize kernel from 5 days postpollination until harvest. Activities were highest in the immature stages and declined as drying progressed. The expression of some of the peptidase genes contributed by the pollen parent was examined during early endosperm development in an F1 cross. The paternally contributed peptidase variants could first be detected 7 days after pollination.

During germination and early seedling growth the peptidase activities continued to decline in the endosperm but maintained high levels in the scutellum. The maize peptidases probably have no direct role in hydrolysis of endosperm storage proteins during germination and growth.

The peptidase isozymes were associated with the soluble cytoplasmic fraction of the maize scutellum during early growth. Only one tissue specificity was found for the peptidases. Occurrence of a particular aminopeptidase isozyme, AMP2, is limited to endosperm tissue during kernel maturation.

2 Present address: Seed Research Laboratory, Beltsville Agricultural Research Center, USDA, Beltsville, Maryland 20705.

3 Send reprint requests to: J. G. Scandalios, Department of Genetics, Box 5487, North Carolina State University, Raleigh, North Carolina 27650.

1 Research supported by National Science Foundation Grant PCM 77-09394 and the North Carolina Agricultural Foundation. Paper 5810 of the Journal Series of the North Carolina Agricultural Research Service.






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Copyright © 1979 by the American Society of Plant Biologists