Variation of mycelial morphology between species and formae spéciales of rust fungi of cereals and grasses

1986 ◽  
Vol 64 (12) ◽  
pp. 2976-2983 ◽  
Author(s):  
R. E. Niks
Keyword(s):  
Host Species ◽  
Primary Infection ◽  
Rust Fungi ◽  
Species Level ◽  
Puccinia Coronata ◽  
Mycelial Morphology ◽  
Infection Structures ◽  
Interspecific Differences ◽  
Mother Cells ◽  
Taxonomic Studies

The morphology of the infection structures (substomatal vesicles, primary infection hyphae, and haustorial mother cells) was described for 23 isolates comprising nine rust species of cereals and grasses. Interspecific differences in morphology were very large. The results indicate that it should be possible to identify single sporelings at least to species level. Between samples of the same rust species collected from different host species, no qualitative differences were found in some cases (Puccinia coronata); in other cases the differences between samples were as large as between species (P. recondita, P. brachypodii). Because primary infection structures develop on virtually any graminaceous plant, all observations were done using barley or Triticum dicoccum seedlings as substrate. The results indicate that inclusion of mycelial morphology in description of rust taxa may be helpful in taxonomic studies. The differences in mycelial morphology may also be exploited in certain phytopathological studies.

Chemical induction of infection structures in rust fungi

1984 ◽  
Vol 8 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Susan G.W. Kaminskyj ◽  
Alan W. Day
Keyword(s):  
Rust Fungi ◽  
Chemical Induction ◽  
Infection Structures

A checklist of the Cymothoidae (Crustacea, Isopoda) recorded from Indian fishes

2011 ◽  
Vol 56 (4) ◽  
Author(s):  
Jean-Paul Trilles ◽  
Samuthirapandian Ravichandran ◽  
Ganapathy Rameshkumar
Keyword(s):  
Host Species ◽  
Parasite Species ◽  
Species Level ◽  
Valid Species ◽  
Nominal Species ◽  
Host Fish ◽  
Host List

AbstractA checklist of the parasitic Cymothoidae of Indian fishes was compiled from parasitological records published between 1783 and 2011. The checklist is arranged alphabetically, providing valid names, synonyms and authorities of the parasite species, as well as valid names and synonyms of the host fish, its capture sites, author(s) and date of published records. The host list consists of all parasites species listed under the host species. A total of 47 nominal species corresponding to 36 valid species are listed from 74 host species belonging to 34 families. Several parasites not identified to species level and parasite species without the host data or where the parasite was found not associated with a fish are also included in this checklist.

Development of infection structures by Hemileia vastatrix in resistant and susceptible selections of Coffea and in Phaseolus vulgaris

1993 ◽  
Vol 71 (8) ◽  
pp. 1001-1008 ◽  
Author(s):  
T. A. Coutinho ◽  
F. H. J. Rijkenberg ◽  
M. A. J. van Asch
Keyword(s):  
Phaseolus Vulgaris ◽  
Primary Infection ◽  
Intercellular Spaces ◽  
Hemileia Vastatrix ◽  
Mesophyll Cells ◽  
Sequence Of Events ◽  
Successful Infection ◽  
Coffee Leaf Rust ◽  
Subsidiary Cells ◽  
Mother Cells

The sequence of events leading to successful infection of Coffea by Hemileia vastatrix, following the formation of an appressorium over a stoma, was investigated using scanning electron microscopy. In the host, Coffea arabica, a torpedoshaped substomatal vesicle initial develops bilaterally from the apex of the infection wedge, while in the nonhost, Phaseolus vulgaris, the infection wedge protrudes into the substomatal chamber. The substomatal vesicle in both host and nonhost, at 48 h postinoculation, is anchor shaped. Haustorial mother cells are formed on stubby primary infection hyphae that curve back onto subsidiary cells. No differences in appearance of these structures were noted between resistant and susceptible coffee selections. A much-branched mycelium ramifies through the intercellular spaces of the mesophyll cells 96 h postinoculation in the host. In bean, the SSV began to collapse 48 h postinoculation. Key words: coffee leaf rust, infection, penetration, Coffea, appressorium, substomatal vesicle.

scholarly journals Transfer of label from 3H-glucose in Digitaria eriantha leaves to the rust fungus Puccinia digitariae Pole Evans.

1985 ◽  
Vol 33 (8) ◽  
pp. 809-812 ◽  
Author(s):  
M E Rey ◽  
H M Garnett
Keyword(s):  
Primary Infection ◽  
Secondary Infection ◽  
Rust Fungus ◽  
Infection Process ◽  
Bremia Lactucae ◽  
Infection Structures ◽  
Obligate Parasites ◽  
Digitaria Eriantha ◽  
Germ Tubes

Digitaria eriantha pentzii was fed 3H-glucose prior to inoculation with uredospores of Puccinia digitariae Pole Evans. Twenty-one hours after inoculation, uptake of label from 3H-glucose by the primary infection structures of P. digitariae was demonstrated employing autoradiography. These results indicate that an exchange of nutrients between host and pathogen occurs very early on in the infection process, during the formation of the primary infection structures. Despite contrary reports that obligate parasites receive no nutrition before establishment of haustoria, this study supports the work of Andrews (Can J Bot 53:1103, 1975), who demonstrated uptake of 3H-glucose label from lettuce cotyledons into the primary and secondary infection vesicles, appressoria, and germ tubes of Bremia lactucae.

THE CYTOLOGY OF INFECTION STRUCTURE DEVELOPMENT IN UREDIOSPORE GERM TUBES OF UROMYCES PHASEOLI VAR. TYPICA (PERS.) WINT.

1967 ◽  
Vol 45 (4) ◽  
pp. 447-450 ◽  
Author(s):  
Ramesh Maheshwari ◽  
A. C. Hildebrandt ◽  
P. J. Allen
Keyword(s):  
Nuclear Division ◽  
In Vitro Differentiation ◽  
Structure Development ◽  
Infection Structures ◽  
Uromyces Phaseoli ◽  
Mother Cells ◽  
Germ Tubes ◽  
Infection Hypha ◽  
Feulgen Technique

Urediospores of Uromyces phaseoli var. typica (Pers.) Wint. race 32 Arth. germinated on mineral oil – nitrocellulose membranes and sequentially developed appressoria, vesicles, and infection hyphae. The nuclear behavior during in vitro differentiation of infection structures was studied by use of the Feulgen technique. The two urediospore nuclei divided in the germ tube before the formation of appressorium. This was followed by a second division of the four daughter nuclei in the appressorium, and occasionally by a third division of the eight nuclei in the vesicle and infection hypha. Haustorial mother cells were formed in infection hyphae in vitro and contained from two to five nuclei. In contrast, nuclear division did not occur in germ tubes where growth continued linearly. Infection structures that developed in vitro resembled those produced during infection of the host by urediospores of other species of rust fungi.

scholarly journals DNA barcode for identification of immature stages of sand flies (Diptera: Psychodidae) collected from natural breeding sites

Zootaxa ◽  
2017 ◽  
Vol 4277 (2) ◽  
pp. 228 ◽  
Author(s):  
RAFAEL JOSÉ VIVERO ◽  
EDUAR ELÍAS BEJARANO ◽  
LUIS GREGORIO ESTRADA ◽  
FERNANDO FLÓREZ ◽  
EDGAR ORTEGA-GÓMEZ ◽  
...  
Keyword(s):  
Dna Barcode ◽  
Species Level ◽  
Coi Gene ◽  
Bootstrap Support ◽  
Sand Flies ◽  
Immature Stages ◽  
Phlebotomine Sand Flies ◽  
Breeding Sites ◽  
Natural Breeding ◽  
Taxonomic Studies

Although phlebotomine sand flies breeding sites have been identified and recorded by several studies, the microhabitats exploited by these insects remain little-known and hard to find. In this context, the difficulty of finding immature stages, and the limited number of taxonomic studies to identify immature stages of phlebotomine sand flies, are considered the major obstacles when attempting a complete inventory of Lutzomyia species. The objective of this study is to validate Cytochrome Oxidase I (Barcode region) as a marker for the identification of immature stages of Lutzomyia species recovered from natural breeding sites in Colombia. Among 142 collected sand flies, 18 immature individuals that did not complete their life cycle were identified to species level through sequencing of the COI gene. Values of K2P genetic distance between 0.002–0.031 allowed the identification of larvae at species level. The bootstrap support values (96%) in the Neighbor-Joining dendrogram were consistent for the majority of the established MOTUS of Lutzomyia atroclavata, Lutzomyia micropyga, Lutzomyia serrana, Lutzomyia cayennensis, Lutzomyia rangeliana, Lutzomyia shannoni and some species of the genus Brumptomyia. The COI gene is validated as a marker for the identification of immature stages of the genus Lutzomyia.  

Sign in / Sign up

Export Citation Format

Share Document