Please enable JavaScript.

Coggle requires JavaScript to display documents.

The biology of blast: Understanding how Magnaporthe oryzae invades rice…

- - - - Formation of melanin
        
        Generate appressorium turgor (glycerol)
        
        Hypha penetration
        
        Rupture the host plant cuticle
  - - - Substantial decrease in virulence
    - - Non-pathogenic
- - - - Important for initial estab-lishment of infection by avoiding the induction of basal plantdefence responses.
    - - MMT1 gene encodes 22 amino acids metallothione in M. oryzae
      - MMT1 was identified because it showed reduced expression in a pmk1 mutant.
      - mmt1 mutants non pathogenic and unable to cause penetration-mediated penetration on the host surface.
      - MMT1 is a powerful antioxidant and plays role during the process of oxidative crosslinking within fungal cell wall during development and polarity reestablishment during plant infection.
    - - CATB is also involved in fungal cell wall biogenesis and differentiation during appressorium formation and penetration hypha production.
- - - - Unable to replicate DNA (segregation of chromatin still occur)
        
        Cell advancing to mitosis with unreplicated DNA.
        
        Germlings arrested growth prior to hooking or swelling of germ tubes tip.
        
        Initiation of appresium formation require DNA.
      - NimA temp-sens mutant- exposed to restrictive temp - germ tube hooked, swollen, unable to differentiate mature appresoria :
      - Blocking mitotic exit
        
        Expressing mutant alleles of CyC1 and CyC2 encoded stabilised version of cvlin B
        
        Resistant to ubiquitin-mediated breakdown
        
        Did not affect appressorium differentiation
  - - - Three nucleiin the conidium are degraded prior to plant infection resultingin a single daughter nucleus in the mature apprpessorium from which all subsequent nuclei in invasive hyphae are formed.
- - - - Ability of GATA factor to undergo transcriptional activation is blocked
  - - - NPR1 and NPR2 involved in regulating nitrogen metabolism
  - - - regulator transcriptional co-repressor
        
        Comprising 3 protein (NMR1, NMR2, NMR3) which can bind to NADP