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Abstract
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Is Salicylic Acid a Translocated Signal of Systemic Acquired Resistance in Tobacco?

V. Shulaev, J. Leon, I. Raskin
V. Shulaev
AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231.
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J. Leon
AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231.
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I. Raskin
AgBiotech Center, Cook College, Rutgers University, P.O. Box 231, New Brunswick, New Jersey 08903-0231.
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Published October 1995. DOI: https://doi.org/10.1105/tpc.7.10.1691

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Abstract

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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Is Salicylic Acid a Translocated Signal of Systemic Acquired Resistance in Tobacco?
V. Shulaev, J. Leon, I. Raskin
The Plant Cell Oct 1995, 7 (10) 1691-1701; DOI: 10.1105/tpc.7.10.1691

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Is Salicylic Acid a Translocated Signal of Systemic Acquired Resistance in Tobacco?
V. Shulaev, J. Leon, I. Raskin
The Plant Cell Oct 1995, 7 (10) 1691-1701; DOI: 10.1105/tpc.7.10.1691
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