When plants are attacked by fungi, they show external and internal symptoms. Examples of cucurbitaceae and Phoenix dactylifera L. (date palm)

Master commun: Microbiologie appliquée-Gestion et valorisation des phytoressources, Module 'Phytopathologie et méthodes de lutte'

Links:Sommaire --- Fungal diseases ---- Passive defenses --- Active defenses --- Engineerd plants for resistance --- - QCM Résistances des plantes aux pathogènes ---

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Plant defense reactions against fungi. Biochemical amd molecular aspects of relations host-pathogen

Aspects biochimiques et moléculaires de la résistance des plantes aux attaques des champignons

1. Plant diseases caused by fungi.

-- Examples in cucurbitaceae

-- Examples in date palm (Phoenix dactylifera L.)

2. Plant passive defenses against pathogens

- Anticipins

-- Anticipins. Example

- Plant phenolics as passive defenses against pathogens

-- Study 1: Toxic phenols against Verticilium albo-atrum growth (LeTourneau et al. (1957), Phytopathology 47, 602.

-- Study 2: Relation entre la toxicité des phénols vis à vis des chamignons et leur structure chimique (Rahouti et al. (1997), Actes Inst. Agron. Vet. (Maroc) 17, 165.

-- Study 3: Phenolics (preformed) act on fungi through inhibition and inactivation of enzymes produced by pathogens. Example of polygalacturonase (PG)

-- Study 4: Phenolics can suppress toxin production by pathogens or detoxify toxins.

Phenol toxicity

3. Plant active defenses against pathogens

-- Active defences involve Salicylic acid (SA), Jasmonic acid (JA) and Ethylene (ET).

-- Mobilization of secondary metabolism:

------ Oxidized phenolics induce resistance
------ Phytoalexines

-- Mobilization of primary metabolism:

----- Pathogenesis-Related (PR) Proteins.
------ Enzymes lytiques: chitinase, glucanase. Example of Chitinase of muskmelon
------ Peroxidase
PLANT ACTIVE DEFENSES

4. Engineered plants for resistance against pathogens

-- Examples of ingineered plants for resistance against pathogens

Sommaire --- Fungal diseases ---- Passive defenses --- Active defenses --- Engineerd plants for resistance -- - QCM Résistances des plantes aux pathogènes ---

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