PHYA is the only gene that encodes a Type I phytochrome. Phytochrome A predominantly perceives far-red light.

TLS Online TPP Program

#Id: 9772

#Unit 6. System Physiology – Plant

Phytoalexins are low molecular weight, lipophilic antimicrobial compounds for which phenylalanine is a substrate used by phenylalanine ammonia lyase (PAL),

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#Id: 9773

#Unit 6. System Physiology – Plant

In Arabidopsis, PTI induces production of indole glucosinolates, to control of fungal pathogens. 

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#Unit 6. System Physiology – Plant

PTI and fungal pathogen entry into epidermal tissue induces several specific cytochrome P450 enzymes, and this leads to accumulation of the indole glucosinolate 4‐methoxyindol‐3‐ylmethylglucosinolate (4M13G).

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#Unit 6. System Physiology – Plant

Salicylic acid (SA) is a phenolic compound and derived from the phenylpropanoid pathway that accumulates to high levels as both free and glucoside conjugates in the vicinity of incompatible infection sites.

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#Unit 6. System Physiology – Plant

SA accumulation leads to enhanced local ROS production.

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#Id: 9777

#Unit 6. System Physiology – Plant

nahG gene encodes the enzyme salicylate hydroxylase, which converts SA to catechol and thus dramatically reduces SA levels.