Transcript Nematology 100

Nematology 100
Lecture 4 Slides
Induced Resistance
JA = jasmonic acid
PR = Pathogenesis-Related genes
SA = salicylic acid
> peroxidase and catalase
ISR = Induced Systemic Resistance
SAR = Systemic Acquired Resistance
Plant Defenses Mechanisms and their Suppression
Damage Associate Molecular Patterns (DAMPs) and Pathogen Associate Molecular
Patterns (PAMPs) lead to defense mechanisms and pathogen-triggered immunity (PTI)
DAMPs include activation of the Jasmonic Acid pathway
– phenolic compunds and others
PAMPs include activation of the Salicylic Acid pathway
– localized programmed cell death – the hypersensitive response
•Salicylic acid signaling disrupted by chorismate mutase produced in the esophageal
glands of some nematodes
•Chorismate mutase in nematodes an example of horizontal gene transfer
the evolution of plant parasitism
Rhabditoidea
Cephaloboidea
Tylenchoidea
horizontal gene transfer- HGT
cellulases – GHF5- glycoside hydrolase family
chorismate mutase
bacteria
the evolution of plant parasitism
Aphelenchoidea
fungus
Bursaphelenchus xylophilus
horizontal gene transfer- HGT
cellulases – GHF45- glycoside hydrolase family