Plant resistance reactions against fungi. Biochemical and molecular aspects of relations between hosts and pathogens
Aspects biochimiques et moléculaires de la résistance des plantes aux attaques des champignons

....plant resistance, fungi, pathogens
plant resistance mechanisms against fungi (pathogens)


Plant resistance reactions against fungi. Biochemical and molecular aspects of relations between hosts and pathogens
Aspects biochimiques et moléculaires de la résistance des plantes aux attaques des champignons


pathogenic fungi are the cause of major biotic stresses and account for about 80-85% of plant diseases leading to significant damages. Plant resistance against fungi as pathogens depends on many factors, such as plant genetic background, environmental conditions and physiological status.


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


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    Plant resistance against fungi