Chemistry Reference
In-Depth Information
Chapter 3
Salicylic Acid and Phospholipid Signaling
Beatriz A. Rodas-Junco, J. Armando Muñoz-Sánchez
and S. M. Teresa Hernández-Sotomayor
Abstract Salicylic acid (SA) signaling has been associated with phospholipids and
the enzymes that metabolize them. However, despite studies conducted by other
research groups, the role of SA signaling via phospholipids in plant responses to
phytoregulators is not yet fully understood. The signal transduction pathway
involves the generation of secondary messengers, through the enzymes such as
phospholipase C (PLC) and phospholipase D (PLD). The signaling pathway of SA
was evaluated in different models of plants, where it was observed that this
compound regulates enzymatic activities to generate a rapid cellular response.
In this chapter, we review the important aspects of the relationship of the SA effects
with phospholipid signal transduction and cellular responses to this component.
Keywords Salicylic acid
Phospholipases
Phytoregulators
Signal transduction
1 Introduction
Salicylic acid (SA) is an important endogenous signaling molecule in plant
defense, which occurs in response to various types of biotic and abiotic stress
(Malamy and Klessing
1992
; Janda et al.
1999
). Studies have shown that SA is a
regulator of several plant physiological processes and is essential in the expression
of some defense genes (Raskin et al.
1990
). Phytoregulators, such as SA and
methyl jasmonate (MeJA), are also used as elicitors for the production of some
secondary metabolites in different plant species. The term elicitor means a biotic or
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