Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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PLANT PHYSIOLOGY , Vol 107, Issue 4 1333-1341, Copyright © 1995 by American Society of Plant Biologists

PLANT-MICROBE AND PLANT-INSECT INTERACTIONS

Rice Cationic Peroxidase Accumulates in Xylem Vessels during Incompatible Interactions with Xanthomonas oryzae pv oryzae

S. A. Young, A. Guo, J. A. Guikema, F. F. White and J. E. Leach
Department of Plant Pathology, Throckmorton Hall (S.A.Y., F.F.W., J.E.L.), and Division of Biological Sciences (J.A.G.), Kansas State University, Manhattan, Kansas 66506-5502

A cationic peroxidase, PO-C1 (molecular mass 42 kD, isoelectric point 8.6), which is induced in incompatible interactions between the vascular pathogen Xanthomonas oryzae pv oryzae and rice (Oryza sativa L.), was purified. Amino acid sequences from chemically cleaved fragments of PO-C1 exhibited a high percentage of identity with deduced sequences of peroxidases from rice, barley, and wheat. Polyclonal antibodies were raised to an 11-amino acid oligopeptide (POC1a) that was derived from a domain where the sequence of the cationic peroxidase diverged from other known peroxidases. The anti-POC1a antibodies reacted only with a protein of the same mobility as PO-C1 in extracellular and guttation fluids from plants undergoing incompatible responses collected at 24 h after infection. In the compatible responses, the antibodies did not detect PO-C1 until 48 h after infection. Immunoelectron microscopy was used to demonstrate that PO-C1 accumulated within the apoplast of mesophyll cells and within the cell walls and vessel lumen of xylem elements of plants undergoing incompatible interactions.


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