Search on : Phytophthora species ONLINE

 


 
 Add this item to the list   Phytophthora siskiyouensis
    

General information

 Organism group:Phytophthora 
 Taxonomic info on species (MycoBank):
 
 Representative strain(s):CBS 122779 = WA5-030403 = ATCC MYA-4187 
 Associated strain(s) in Q-bank:
 

Substrate and country information

 Substrates of included strains:Alnus cordata (Betulaceae); water from seasonal tributary 
 Countries of included strains:United States of America 
 
Other reported substrates and countries
 
Kingdom Planta
 
Symptoms on host plant:
antracnose ?
canker ?
dieback ?
wilting ?
 
leaf spot ?
root rot ?
stem base rot ?
   
 
 
Type of infection on plant:
Pathogenic ?
Opportunistic ?
Saprophytic ?
 
 
 
Other substrata
 Inorganic material:water (seasonal tributary) 
 
Geographic origin
 Latitude, longitude of isolation:
(?°; ?°; ?) ± ? km (Hide map)
 

Quarantine information

 Has quarantine status?:No 
 EU status:
 
 EPPO status:
 

Morphological data

 
Pictures
 Sporangia:
  • Phytophthora siskiyouensis CBS 122779 intercalary sporangium 100x
  • Phytophthora siskiyouensis CBS 122779 sporangium lateral displaced attachment 100x
  • Phytophthora siskiyouensis CBS 122779 sporangium sporangiophors sympodial somewhat tappered 100x
  • Phytophthora siskiyouensis CBS 122779 typical sporangia with distorted shapes 100x
 
 Sporangiophores:
  • Phytophthora siskiyouensis CBS 122779 intercalary swelling on sporangiophore 100x
 
 Oogonia & Antheridia:
  • Phytophthora siskiyouensis CBS 122779 aborted oogonium fragmented wall 1 100x
  • Phytophthora siskiyouensis CBS 122779 antheridium surrounded by hyphal knot 100x
  • Phytophthora siskiyouensis CBS 122779 antheridium with spine fragmented oogonial wall 100x
  • Phytophthora siskiyouensis CBS 122779 oogonium with fragmented wall 100x
  • Phytophthora siskiyouensis CBS 122779 small oogonium with fragmented wall 100x
 
 Culture CMA after 7 days at 18 °C:
  • Phytophthora siskiyouensis CBS 122779 CMA after 7 days at 18 degrees
 
 Culture PDA after 7 days at 18 °C:
  • Phytophthora siskiyouensis CBS 122779 PDA after 7 days at 18 degrees
 
 Culture V8 after 7 days at 18 °C:
  • Phytophthora siskiyouensis CBS 122779 V8 after 7 days at 18 degrees
 
 
Colony morphology
 
CMA, colony pattern description:
no special pattern no
rozette no
 
chrysanthenum no
coarsly radiate yes
 
 
PDA: colony pattern description:
no special pattern no
rozette no
 
chrysanthenum yes
coarsly radiate no
 
 
CMA colony edge description:
sharp yes
vague, gradual no
irregular, (rafelig) no
 
 
 
CMA: aerial mycelium description:
only submerged mycelium yes
sparse aerial mycelium no
dense aerial mycelium no
 
fluffy no
velvety no
cottony no
 
 
PDA: aerial mycelium description:
only submerged mycelium no
sparse aerial mycelium yes
dense aerial mycelium no
 
fluffy no
velvety yes
cottony no
 
 
PDA: colony edge description:
sharp yes
vague (gradual) no
irregular, (rafelig) no
 
 
 
V8: colony pattern description:
no special pattern no
rozette no
 
chrysanthemum yes
coarsely radiate no
 
 
V8: colony edge description:
sharp yes
vague, gradual no
irregular (rafelig) no
 
 
 
V8: aerial mycelium description:
only submerged mycelium no
sparse aerial mycelium yes
dense aerial mycelium no
 
fluffy no
velvety yes
cottony no
 
 
Characters in vitro
 
Sporangia in water culture
 
Shape of sporangia:
spherical/globose no
ellipsoid yes
ovoid yes
obpyriform no
obturbinate no
 
obovoid no
elongated neck/ beaked no
tapered base variable
distorted shapes yes
constricted ?
 
 Remarks on sporangia:Distorted shapes are very common. Distorted sporangia are usually broad, reniform or kidney shaped. 
 Width of sporangia (µm):(23.4) 28.33 - 40.33 (49.96) 
 Average length/width ratio:(1) 1.08 - 2.07 (2.36) 
 Caducous pedicels length (µm):(1.75) 14.63 - 55.48 (66) 
 Length of sporangia (µm):(25.8) 33.74 - 65.79 (95) 
 
Pore type of sporangia:
non-papillate no
semi-papillate yes
papillate no
 
 
 Discharge pore width:(5.29) 5.95 - 7.53 (8.82) 
 
Sporangial characteristics:
Are the sporangia caduceous? yes
>1 apex/papilla yes
Presence of hyphal projections (Oc) yes
Collapse after dehiscence no
 
Laterally displaced attachment of sporangiophore (Oc) yes
Occurence of intercallary sporangia yes
Basal plug conspicious no
   
 
 
Sporangiophores in water culture
 
Sporangiophores on agar:
compound sympodial sporangiophores no
sympodial branching on agar ?
are sporangia present on agar?: ?
 
 
 
Sporangiophores in water:
long, irregularly branched no
umbellate no
internal proliferation no
Sympodia variable
 
basal swellings yes
intercalary swellings yes
clumps no
   
 
 
Antheridia on CMA medium
 Length of antheridia (µm):(9.7) 10 - 16.6 (17.8) 
 Remarks on antheridia:
Mostly paragynous, amphigynous antheridia are rare. Antheridia can be attached anywhere on the oogonium. Most antheridia are diclinous
 
 
Shape of antheridia:
short cylindrical no
elongated cylindrical no
spherical yes
irregular yes
 
rectangular no
ellipsoid or ovoid yes
club shaped yes
   
 
 Width of antheridia (µm):(7.6) 8 - 11.5 (12.6) 
 
Type of antheridia:
amphigynous variable
paragynous yes
 
 
 
Antheridial characteristics:
Can antheridia be diclinous? yes
Do 2 celled antheridia occur? no
Tangled or knotted hyphae around the antheridium yes
 
Spine or digitate projections on antheridium yes
Can oogonia have 2 or more antheridia yes
Intercalary or subterminal antheridia? no
 
 
Oogonia on CMA medium
 Length of oogonia (µm):(23.5) 29.2 - 39.8 (41.7) 
 Width of oogonia (µm):(23.5) 29.2 - 39.8 (41.7) 
 Remarks on oogonia:
Oogonial walls seem to fall apart when aging, the agar around the oogonia has many scattered fragments of the wall, wall thickness is hard to measure as a result of this. Oogonia have a yellow to brown color. Oospores are usually slightly aplerotic.
 
 Oogonia wall thickness (µm):(0.38) 0.48 - 1.15 (2.03) 
 
Oogonial characteristics:
Ornamentation no
Tapered base no
Wall rough with age yes
 
Oogonial stalk often excentric in antheridium ?
Clustered typically no
   
 
 
Oospores on CMA medium
 Width of oospores (µm):(18.7) 25.6 - 32.1 (33) 
 Wall thickness of oospores (µm):(0.49) 0.66 - 2.47 (3.2) 
 Length of oospores (µm):(18.7) 25.6 - 32.1 (33) 
 
Oospores plerotic or aplerotic?:
Plerotic variable
Aplerotic yes
Slightly aplerotic yes
 
 
 
Chlamydospores in water culture or on CMA medium
 Chlamydospores presence:absent 
 Length of chlamydospores (µm):? 
 Width of chlamydospores (µm):? 
 
Shape of chlamydospores:
globose ?
subglobose ?
Botryose ?
 
 
 Location of chlamydospores on plate:? 
 
Chlamydospore position:
Lateral ?
Terminal ?
Clustered ?
 
Intercallary ?
Catenulate ?
   
 
 Chlamydospore wall thickness:? 
 
Hyphal swellings in water culture
 
Shape of hyphal swellings:
Globose ?
radiating hyphae ?
Subglobose ?
 
Flask- or Bottleshaped / (Ob)-pyriform ?
Elongate ?
Irregular/coralloid ?
 
 Length of hyphal swellings (µm):? 
 Width of hyphal swellings (µm):? 
 
Clustering of hyphal swellings:
Solitary ?
Catenulate, in chains ?
Clustered / Aggregated ?
 
 
 
Presence of hyphal swellings:
In agar ?
On agar ?
 
In water ?
Absent ?
 
 
Sexual state:
homothallic yes
heterothallic mating type A1 no
 
heterothallic mating type A2 no
Sterile no
 
 
Hyphae on CMA medium
 Maximum hyphal diameter:7.2 
 
Daily growth
 Daily growth at 24 °C on CMA agar in mm:3.8 
 
Cardinal temperatures
 Lowest temperature at which sustained growth was observed:3 
 Highest temperature at which sustained growth was observed:27 
 Optimum growth temperature interval starts at ... °C:21 
 Optimum growth temperature interval ends at ... °C:27 

DNA sequence data

 Sequences in Q-bank:
 

Literature

 Original publication:
 
Database Copyright © 2017 Q-bank Fungi
Software Copyright © 1999-2017 BioAware SA/NV. - Release: 2017/04/17
Powered by BioloMICS Net