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 Add this item to the list   Phytophthora alni subsp. multiformis
    

General information

 Organism group:Phytophthora 
 Taxonomic info on species (MycoBank):
 
 Representative strain(s):PD 20019551 = P770 = P16202 
 Associated strain(s) in Q-bank:
 

Substrate and country information

 Substrates of included strains:Alnus sp. (Betulaceae) bark 
 Countries of included strains:Netherlands 

Quarantine information

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

Morphological data

 
Pictures
 Sporangia:
  • Phytophthora alni subsp. multiformis P16202 internal proliferation 100x
  • Phytophthora alni subsp. multiformis P16202 sporangium 100x
  • Phytophthora alni subsp. multiformis P16202 sporangium 100x
 
 Sporangiophores:
  • Phytophthora alni subsp. multiformis P770 sporangiophore with hyphal swellings 100x
  • Phytophthora alni subsp. multiformis P770 sporangiophores with hyphal swellings 20x
 
 Oogonia & Antheridia:
  • Phytophthora alni subsp. multiformis P16202 aborted oospore knotted hyphae around antheridium 100x
  • Phytophthora alni subsp. multiformis P16202 clusters of oogonia 20x
  • Phytophthora alni subsp. multiformis P16202 ornamented oogonium wall 100x
  • Phytophthora alni subsp. multiformis P16202 smooth walled oogonium and antheridium 1 100x
  • Phytophthora alni subsp. multiformis P16202 smooth walled oogonium and antheridium 2 100x
  • Phytophthora alni subsp. multiformis P16202 wavy oogonium wall 100x
 
 Hyphal swellings:
  • Phytophthora alni subsp. multiformis P770 typical hyphae water culture 10x
 
 
Characters in vitro
 
Sporangia in water culture
 
Shape of sporangia:
spherical/globose no
ellipsoid yes
ovoid yes
obpyriform yes
obturbinate no
 
obovoid no
elongated neck/ beaked no
tapered base yes
distorted shapes no
constricted no
 
 Width of sporangia (µm):(20.2) 26.3 - 45.1 (45.9) 
 Average length/width ratio:(1.12) 1.2 - 2 (2.2) 
 Length of sporangia (µm):(27) 34.6 - 69 (79.4) 
 
Pore type of sporangia:
non-papillate yes
semi-papillate no
papillate no
 
 
 Discharge pore width:(10.2) 11 - 16 (17.9) 
 
Sporangial characteristics:
Are the sporangia caduceous? no
>1 apex/papilla no
Presence of hyphal projections (Oc) no
Collapse after dehiscence ?
 
Laterally displaced attachment of sporangiophore (Oc) no
Occurence of intercallary sporangia no
Basal plug conspicious ?
   
 
 
Sporangiophores in water culture
 
Sporangiophores on agar:
compound sympodial sporangiophores no
sympodial branching on agar no
are sporangia present on agar?: no
 
 
 
Sporangiophores in water:
long, irregularly branched ?
umbellate no
internal proliferation yes
Sympodia yes
 
basal swellings no
intercalary swellings yes
clumps no
   
 
 
Antheridia on CMA medium
 Length of antheridia (µm):(9.6) 12.22 - 21.04 (26.9) 
 Remarks on antheridia:strain P770: Antheridia are often hard to see because of dense hyphal knots. Measurements are for amphigynous antheridia, paragynous antheridia occur as well, but are relatively rare, and often obscured by the aforementioned hyphal knots. 
 
Shape of antheridia:
short cylindrical variable
elongated cylindrical yes
spherical yes
irregular yes
 
rectangular no
ellipsoid or ovoid yes
club shaped no
   
 
 Width of antheridia (µm):(10.3) 11.38 - 16.38 (19.3) 
 
Type of antheridia:
amphigynous yes
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 no
Intercalary or subterminal antheridia? yes
 
 
Oogonia on CMA medium
 Length of oogonia (µm):(30.1) 39.9 - 61 (72.9) 
 Width of oogonia (µm):(32) 36.6 - 61.3 (65.6) 
 Remarks on oogonia:P770 : Only a small fraction of oogonia are ornamented (about 10%)Oospores are usually plerotic or nearly so, markedly aplerotic oospores are rare. Aborted oospores are quite common.  
 Oogonia wall thickness (µm):(0.7) 1.26 - 3.18 (4.6) 
 
Oogonial characteristics:
Ornamentation yes
Tapered base yes
Wall rough with age no
 
Oogonial stalk often excentric in antheridium yes
Clustered typically yes
   
 
 
Oospores on CMA medium
 Width of oospores (µm):(28.2) 34.7 - 52.8 (55.9) 
 Wall thickness of oospores (µm):(1.4) 1.9 - 4.1 (5.1) 
 Length of oospores (µm):(28.2) 34.7 - 52.8 (55.9) 
 
Oospores plerotic or aplerotic?:
Plerotic yes
Aplerotic yes
Slightly aplerotic variable
 
 
 
Chlamydospores in water culture or on CMA medium
 Chlamydospores presence:absent 
 
Hyphal swellings in water culture
 
Sexual state:
homothallic yes
heterothallic mating type A1 no
 
heterothallic mating type A2 no
Sterile no
 
 
Hyphae on CMA medium
 Remarks on hyphae:Hyphae in water have a uniform thickness and are branched at regular intervals. 
 
Daily growth
 Daily growth at 24 °C on CMA agar in mm:4.5 
 
Cardinal temperatures
 Lowest temperature at which sustained growth was observed:3 
 Highest temperature at which sustained growth was observed:30 
 Optimum growth temperature interval starts at ... °C:21 
 Optimum growth temperature interval ends at ... °C:24 

DNA sequence data

 Sequences in Q-bank:
 

Literature

 Original publication:
 
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