Immunological and Ultrastructural Demonstration of Nodulation of the European Alnus glutinosa (L.) Gaertn. Host Plant by an Actinomycetal Isolate from the North American Comptonia peregrina (L.) Coult. Root Nodule

The inoculation of the European Alnus glutinosa (L.) Gaertn. host plant by a crushed-nodule inoculum, prepared with the North-American Alnus crispa var. mollis Fern, root nodule, was successful. Fluorescein- and ferritin-labelled antibodies, specific against the A. crispa var. mollis root nodule endophyte (Lalonde et al. 1975), demonstrated the identity of this endophyte in the resulting nodules. The nodulation process of this abnormal host–endophyte system was studied by light and electron microscopy. An excretion of host blebs containing electron-dense polysaccharide material, resulting in the formation of exo-encapsulation threads containing presumptive endophytic bacterial cells, was associated with deformed root hairs. Originating from an exoen-capsulation thread, the endophyte penetrates the root hair cell and then migrates as a hypha toward the cortical cells of the root. Its migration in the cortical cells of the primary nodule results in the induction of a lateral root which develops as the true nodule. The ultrastructure of the A. crispa var. mollis endophyte developing in the primary and true nodule of the abnormal A. glutinosa host was similar to the one induced inside its normal A. crispa var. mollis host. The actinomycetal intruder was a branched and septate hypha able to produce septate vesicles. The endophyte was always encapsulated in an electron-dense polysaccharide material surrounded by a host plasma membrane envelope. However, in this abnormal host–endophyte system, the number of primary nodules formed per root system was drastically reduced, and their appearance was delayed by 1 to 2 weeks. The delayed nodules were effective in fixing nitrogen and able to support satisfactory plant growth in a nitrogen-free medium.

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First records of the North American leafhopper Gyponana mail (Hemiptera: Cicadellidae) invading urban gardens and agroecosystems in Europe

Acta Entomologica Musei Nationalis Pragae ◽

10.37520/aemnp.2021.011 ◽

2021 ◽

pp. 213-219

Author(s):

Valeria Trivellone ◽

Vally Forte ◽

Luisa Filippin ◽

Christopher H. Dietrich

Keyword(s):

Phylogenetic Analysis ◽

Host Plant ◽

North American ◽

Male Genitalia ◽

Morphological Study ◽

European Population ◽

Northern Italy ◽

Urban Gardens ◽

The North ◽

Palearctic Region

The Nearctic leafhopper species Gyponana (Gyponana) mali DeLong, 1942 is reported from Europe for the fi rst time and represents the fi rst record of the tribe Gyponini Stål, 1870 (Hemiptera: Cicadellidae: Iassinae: Gyponini) for the Palearctic Region. Specimens were collected in southern Switzerland (Ticino) and two regions of northern Italy (Lombardy and Veneto) in 2015–2019. The preferred host plant in these areas appears to be Cornus sanguinea L. Phylogenetic analysis of the COI barcode sequences grouped one of the European specimens with three individuals of G. (G.) mali from Ontario, Canada. Morphological study indicated that the male genitalia of the European population are intermediate between G. (G.) mali and G. (G.) extenda DeLong, 1942.

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Distribution, Incidence and Severity of the Catalpa Powdery Mildew Caused by Erysiphe elevata in North-Eastern Romania

Notulae Scientia Biologicae ◽

10.15835/nsb10410374 ◽

2018 ◽

Vol 10 (4) ◽

pp. 614-617

Author(s):

Vasilică C. CHINAN ◽

Ciprian C. MÂNZU

Keyword(s):

Powdery Mildew ◽

Host Plant ◽

North American ◽

High Frequency ◽

Green Spaces ◽

The North ◽

North Eastern

Erysiphe elevata is a North American fungus that causes the powdery mildew of Catalpa species. The present study brings new data on the spread of this species in Romania, and given its invasiveness in Europe, the study evaluates the incidence and intensity of the powdery mildew caused to Catalpa bignonioides (Southern catalpa). In 2017, 12 North-Estern Romanian cities where C. bignonioides had been planted in green spaces were investigated. The results have shown that the pathogen is widespread in the North-Estern part of Romania, accompanying the host plant in all of the localities investigated. In addition, the high frequency of the disease, confirms the invasiveness of E. elevata, most affected being the trees that were planted along streets and in public squares. A specimen of E. elevata was sequenced and the BLAST results revealed that it is identical to samples from France and Korea.

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The genus Alucita in North America, with description of two new species (Lepidoptera: Alucitidae)

The Canadian Entomologist ◽

10.4039/n03-095 ◽

2004 ◽

Vol 136 (4) ◽

pp. 553-579 ◽

Cited By ~ 4

Author(s):

Bernard Landry ◽

Jean-François Landry

Keyword(s):

New York ◽

British Columbia ◽

New Species ◽

North America ◽

Host Plant ◽

North American ◽

Type Locality ◽

Widespread Species ◽

The North ◽

Two New Species

AbstractThe North American fauna of Alucitidae is shown to include three widespread species: Alucita montana Barnes et Lindsey, 1921 (nec Cockerell), Alucita adriendenisisp. nov. (type locality: Manitoulin Island, Ontario, Canada), and Alucitalalanneisp. nov. (type locality: Maynooth, Ontario, Canada). Alucita hexadactyla (L., 1758) and A. huebneri Wallengren, 1862 do not occur in North America. The three North American species are described and illustrated. Alucita montana is found from southwestern Quebec and Vermont, west to British Columbia, and south to Arizona, California, and Texas; its caterpillar is associated with Symphoricarpos spp. (Caprifoliaceae). Alucita adriendenisi is known from northwestern Quebec and New York, west to Alberta and the Northwest Territories, with more southern populations (isolated?) in West Virginia, Arizona, and Texas; its caterpillar feeds on flowers of Lonicera dioica L. (Caprifoliaceae) in Michigan. Alucita lalannei has been found in Ontario, Manitoba, and Alberta, Canada; its host plant is unknown.

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