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Paper Information

Journal:   ROSTANIHA   2006 , Volume 7 , Number 2 (27); Page(s) 177 To 192.
 
Paper: 

MORPHOLOGY OF PENICILLATE CELLS IN THE GENUS PHYLIACTINIA (ERYSIPHACEAE) BASED ON IRANIAN SPECIMENS

 
 
Author(s):  PIRNIA M., KHODAPARAST S.A.*, ABBASI MEHRDAD
 
* DEPARTMENT OF PLANT PROTECTION, COLLEGE OF AGRICULTURE, GILAN UNIVERSITY
 
Abstract: 

The genus Phyllactinia is one of the members of Erysiphaceae (Erysiphales, Ascomycota) which parasitize several host plant families. This taxon is well characterized by having acicular appendages with bulbous swelling at the base and penicillate cells which are outgrowth of some ascoma wall cells. A number of challenges exist to distinguish species assigned to this taxon. This is because of a few morphological characters available for species delimitation. Identification is further complicated for some species such as P. guttata, the best known species causing powdery mildew on more than 50 host plant families (BRAUN 1987, 1995), even though they posses close morphological characterization. The most taxonomic studies on the genus Phyllactinia have focused primarily on characters other than morphology of penicillate cells. The best known study for taxonomic purposes carried out by SHIN & LI (2002). They examined 15 species and conCludedthat, penicillate cell morphology is consistent in particular species and is sufficient different among species and could be used for species delimitation in combination with other taxonomic criteria. However, SHIN & LI (2002) examined just one specimen belongs to more complicated species viz. P. guttata. In this study, we examined specimens collected from 11 different host plant families. Results showed that, Iranian specimens belonging to some species such as P. jraxini, P. pistaciae and P. guttata on Corylus avellana posses the same morphology as described by SHIN & LI (2002). However, we also found different results in our investigation. Phyllactinia mali on Crataegus and Mespillus showed different penicillate cell morphology when compared to Pyrus isolates. Phyllactinia on Pyrus has been identified as P. mali by some authors (SHIN 2000, SHIN & LI 2002 and NUMURA 1997), though we tentatively identified it as P. guttata. Two specimens from Cornus spp. were examined in this study. These specimens showed different penicillate cell morphology. The fungus on Cornus sanguinea showed the same morphology as drawn by SHIN & LI (2002), but the other one on Cornus sp. Was different. Other specimens assigned to P. guttata showed more or less different morphology in penicillate cells. It is difficult to conclude whether these specimens belong to different taxa. The penicillate cell morphology may not be sufficient to detect the particular identities among complex species, P. guttata. However, it may be useful for species identification in combination with other characters. We recommend more studies in addition to analysis of penicillate cell morphology especially DNA sequencingto characterize new taxa of these fungi. All specimens cited in this paper, are deposited in the mycological collection of Gilan University, Rasht and Fungal Reference Collection ("IRAN") of the Ministry of Jihad-e-Agriculture, Tehran (Iran).

 
Keyword(s): POWDERY MILDEW, ERYSIPHACEAE, PHYLLACTINIA, PENICILLATE CELLS
 
References: 
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