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THE PLANT CELL, Vol 7, Issue 10 1691-1701, Copyright © 1995 by American Society of Plant Biologists
Is Salicylic Acid a Translocated Signal of Systemic Acquired Resistance in Tobacco?
V. Shulaev, J. Leon and I. Raskin
AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231
Salicylic acid (SA) is a likely endogenous signal in the development of
systemic acquired resistance (SAR) in some dicotyledonous plants. In
tobacco mosaic virus (TMV)-resistant Xanthi-nc tobacco, SA levels increase
systemically following the inoculation of a single leaf with TMV. To
determine the extent to which systemic increases in SA result from SA
export from the inoculated leaf, SA produced in TMV-inoculated or healthy
leaves was noninvasively labeled with 18O2. Spatial and temporal
distribution of 18O-SA indicated that most of the SA detected in the
healthy tissues was synthesized in the inoculated leaf. No significant
increase in the activity of benzoic acid 2-hydroxylase, the last enzyme
involved in SA biosynthesis, was detected in upper uninoculated leaves,
although the basal level of enzyme activity was relatively high. No
increases in SA level, pathogenesis-related PR-1 gene expression, or TMV
resistance in the upper uninoculated leaf were observed if the
TMV-inoculated leaf was detached up to 60 hr after inoculation. Apart from
the inoculated tissues, the highest increase in SA was observed in the leaf
located directly above the inoculated leaf. The systemic SA increase
observed during SAR may be explained by phloem transport of SA from the
inoculation sites.
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