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Proteins Induced by Jasmonate (JIPs)

As with many phytohormones, jasmonate exhibits pleiotropic effects. It is regarded as a typical stress hormone and, in this context, as a hormone triggering senescence (leaf yellowing). Correspondingly, it acts synergistically with ABA and ethylene (see Chap. 1.6.2).

According to its pleiotropic effects, jasmonate induces the expression of several very different proteins and enzymes which are called jasmo-nate-induced proteins (JIPs). Table 1.10.1 gives a survey of the most important JIPs. For many of them, however, the biological functions have not yet been elucidated.

Table 1.10.1. Reactions which are induced by stress and/or during developmental phases in which jasmonate is involved. ABA Abscisic acid; ACC aminocyclopropanecarboxylate oxidase; Et ethylene; JA jasmonic acid; JIPs jasmonate-in-duced proteins; 5 systemin; S/A salicylic acid. (After Wasternack and Parthier 1997)

Process

Signal(s)

Protein(s)/reaction

Gene

Wounding

S, JA, ABA, Et

Proteinase inhibitors

Yes

Pathogen attack

JA, SA

Thionins, "pathogenesis-related proteins"

Yes

Elicitor (fungal) application

JA, Et

Phytoalexin-producing enzymes

Yes

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