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THE PLANT CELL, Vol 1, Issue 9 881-887, Copyright © 1989 by American Society of Plant Biologists
Pathogenesis-Related Proteins Are Developmentally Regulated in Tobacco Flowers
T. Lotan, N. Ori and R. Fluhr
Department of Plant Genetics, The Weizmann Institute of Science, Rehovot 76100, Israel
The accumulation of pathogenesis-related proteins (PR) in tobacco leaves
has been casually related to pathogen and specific physiological stresses.
The known enzymatic function of some of these proteins is potentially
antimicrobial. By using antibodies specific to three classes of
pathogenesis-related proteins, we examined tobacco plants during their
normal growth. The pathogenesis-related proteins accumulated during the
normal development of the tobacco flower. The PR-1 class of proteins
(biological function unknown) is located in sepal tissue. PR-P,Q
polypeptides are endochitinases and are present in pedicels, sepals,
anthers, and ovaries. A glycoprotein serologically related to the PR-2,N,O
class is a (1,3)-[beta]-glucanase and is present in pistils. Differential
appearance during flower development, in situ localization, and
post-translational processing of floral pathogenesis-related proteins point
to a hitherto unsuspected function these classes of pathogenesis-related
proteins play in the normal process of flowering and reproductive
physiology.
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