scholarly journals Delayed rejection in a leaf-cutting ant after foraging on plants unsuitable for the symbiotic fungus

2008 ◽  
Vol 19 (3) ◽  
pp. 575-582 ◽  
Author(s):  
Hubert Herz ◽  
Bert Hölldobler ◽  
Flavio Roces
Keyword(s):  
Symbiotic Fungus ◽  
Leaf Cutting ◽  
Delayed Rejection

Taxonomic and nomenclatural novelties in Leucoagaricus (Agaricaceae) from Brazil

Phytotaxa ◽  
2021 ◽  
Vol 494 (1) ◽  
pp. 42-58
Author(s):  
CELESTE HEISECKE ◽  
JAIME ANDRÉS DUQUE BARBOSA ◽  
MARIA ALICE NEVES ◽  
ANIBAL ALVES DE CARVALHO JR
Keyword(s):  
Rio De Janeiro ◽  
Molecular Data ◽  
Full Description ◽  
Symbiotic Fungus ◽  
Leaf Cutting ◽  
Morphological And Molecular Data ◽  
Leucoagaricus Gongylophorus ◽  
Pileus Surface

Leucoagaricus nzumbae sp. nov. (Agaricaceae) is described based on morphological and molecular data from Teresópolis, Rio de Janeiro, Brazil. This species is characterized by the delicate small basidiomes that turn completely lilac when dried, brownish color of the pileus surface, and trichodermal elements with intracellular and parietal brown pigments of the pileus covering. A lectotype and an epitype are designated for Leucoagaricus gongylophorus, a symbiotic fungus of leaf-cutting ants. Full description, nomenclatural notes, and illustrations of fresh basidiomes in situ and of the main macro-and micromorphological features of both species are provided.

scholarly journals Toxicity of sesame extracts to the symbiotic fungus of leaf-cutting ants

1990 ◽  
Vol 80 (3) ◽  
pp. 349-352 ◽  
Author(s):  
Fernando Carlos Pagnocca ◽  
Osvaldo Aulino da Silva ◽  
Maria Jose Hebling-Beraldo ◽  
Odair Correa Bueno ◽  
João Batista Fernandes ◽  
...  
Keyword(s):  
Sesamum Indicum ◽  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
Leucocoprinus Gongylophorus

AbstractExtracts of different sesame plant (Sesamum indicum) Linnaeus organs inhibited the in vitro growth of the fungus Leucocoprinus gongylophorus (Möller) (=Rozites gongylophora Möller), which is cultivated by the leaf-cutting ants of the species Atta sexdens rubropilosa Forel (Hymenoptera: Formicidae). The presence of the factor responsible for this inhibition was detected in methanol or chloroform extracts and is constant in the plant.

scholarly journals DETERMINAÇÃO DO CONSUMO DE FOLHAS DE Eucalyptus grandis POR FORMIGUEIROS DE Atta sexdens rubropilosa

FLORESTA ◽  
2013 ◽  
Vol 43 (4) ◽  
pp. 593
Author(s):  
Daniele Ukan ◽  
Nilton José Sousa ◽  
Claudiane Belinovski
Keyword(s):  
Organic Matter ◽  
Conversion Rate ◽  
Plant Material ◽  
Conversion Factor ◽  
Eucalyptus Grandis ◽  
Atta Sexdens ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting

Pelo fato de cortarem material vegetal e o transportarem para o interior de suas colônias, as saúvas tornam-se importantes agentes de acumulação de matéria orgânica no solo, por meio de suas câmaras de descarte (lixo). Esse material acumulado é oriundo do processamento do fungo simbionte e se torna uma fonte de nutrientes. Diante desse contexto, o objetivo do trabalho foi determinar a conversão de folhas de Eucalyptus grandis em resíduos, por colônias de Atta sexdens rubropilosa monitoradas em laboratório. Foram selecionadas 8 colônias de Atta sexdens rubropilosa, sendo 4 coletadas em 2007 (denominados adultos) e 4 coletadas em 2010 (denominadas jovens). Durante 72 dias, elas foram supridas com folhas de mudas de Eucalyptus grandis. A média do fator de conversão entre os formigueiros adultos e jovens monitorados em laboratório foi de 1,49. Observou-se que 63,65% do material fornecido aos formigueiros converteram-se em resíduos.Palavras-chave: Resíduos; formigas-cortadeiras; taxa de conversão. AbstractDetermination of consumption of Eucalyptus grandis by nests of Atta sexdens rubropilosa. Because ants cut and carry plant material inside their colonies, they become important agents for the accumulation of organic matter in the soil through their disposal chambers. This accumulated material comes from  symbiotic fungus processing and can become a source of nutrients. In the context, the objective of this study was to determine the conversion of leaves of Eucalyptus grandis into waste by colonies of Atta sexdens rubropilosa monitored in laboratory. We selected eight colonies of Atta sexdens rubropilosa, 4 collected in 2007 (called adults), and 4 in 2010 (referred to as young). During 72 days, they were supplied with leaves of Eucalyptus grandis. The average conversion factor between the young and adult colonies monitored in the laboratory was 1.49. We observed that 63.65% of the material supplied to the colonies converted to waste.Keywords: Waste; leaf-cutting ants; conversion rate.

Toxicity of synthetic piperonyl compounds to leaf-cutting ants and their symbiotic fungus

2001 ◽  
Vol 57 (7) ◽  
pp. 603-608 ◽  
Author(s):  
Sandra R Victor ◽  
Fernando R Crisóstomo ◽  
Fabiana C Bueno ◽  
Fernando C Pagnocca ◽  
João B Fernandes ◽  
...  
Keyword(s):  
Symbiotic Fungus ◽  
Leaf Cutting

Control of the behaviour of leaf-cutting ants by their ‘symbiotic’ fungus

1996 ◽  
Vol 52 (6) ◽  
pp. 631-635 ◽  
Author(s):  
P. Ridley ◽  
P. E. Howse ◽  
C. W. Jackson
Keyword(s):  
Symbiotic Fungus ◽  
Leaf Cutting

scholarly journals Isolation and molecular characterization of symbiotic fungus from Acromyrmex ambiguus and Acromyrmex heyeri ants of Rio Grande do Sul State, Brazil

2015 ◽  
Vol 45 (7) ◽  
pp. 1256-1261 ◽  
Author(s):  
Daniela Isabel Brayer Pereira ◽  
Sônia de Avila Botton ◽  
Maria Isabel de Azevedo ◽  
Danieli Urach Monteiro ◽  
Carla Weiblen ◽  
...  
Keyword(s):  
Rio Grande ◽  
Its Region ◽  
Selective Medium ◽  
Universal Primers ◽  
Rio Grande Do Sul ◽  
Symbiotic Fungus ◽  
Leaf Cutting ◽  
Total Dna ◽  
Leucoagaricus Gongylophorus ◽  
Relationship Of

Leaf-cutting ants of the genera Atta and Acromyrmex determine serious agricultural problems and live on symbiosis with Leucoagaricus gongylophorus. The aim of this study is to identify morphological and molecularly, as well as to verify the genotypic variability of the symbiotic fungus cultivated by A. heyeri and A. ambiguus from three different regions of the state of Rio Grande do Sul, Brazil. Fungus gardens were collected and fragments of mycelia were grown in selective medium. Total DNA was extracted and amplification of the ITS region was performed by PCR using universal primers. After DNA sequencing, the chromatograms were assembled and phylogenetic analyzes were performed by the Neighbor-Joining method. A total of six isolates of L. gongylophorus were obtained and their identities were confirmed by molecular analyses. Phylogenetic analysis of the ITS region showed a tree with two distinct groups regarding the fungus isolates from A. heiyeri and A. ambiguous. In this study, it was verified that A. heyeri and A. ambiguous, cultivate the same fungus. Additionally, the molecular marker used in this study showed variations in L. gongylophorus, evidencing two distinct branches in the phylogenetic tree, according to the ant species that cultivate L. gongylophorus. However, other studies involving the inclusion of a great number of isolates of L. gongylophorus, as well as the use of other molecular markers to validate the possible variations in the phylogenetic relationship of this symbiotic fungus are required.

scholarly journals Inhibition of the symbiotic fungus of leaf-cutting ants by coumarins

2005 ◽  
Vol 16 (3b) ◽  
pp. 669-672 ◽  
Author(s):  
Marizete F. P. Godoy ◽  
Sandra R. Victor ◽  
Adriana M. Bellini ◽  
Gisleine Guerreiro ◽  
Waldireny C. Rocha ◽  
...  
Keyword(s):  
Symbiotic Fungus ◽  
Leaf Cutting

scholarly journals A New Imidazole Alkaloid and Other Constituents from Pilocarpus grandiflorus and their Antifungal Activity

2005 ◽  
Vol 60 (7) ◽  
pp. 787-791 ◽  
Author(s):  
Rejane C. de Souza ◽  
João B. Fernandes ◽  
Paulo C. Vieira ◽  
M. Fátima das G. F. da Silva ◽  
Marizete F. P. Godoy ◽  
...  
Keyword(s):  
Phenolic Compounds ◽  
Antifungal Activity ◽  
Vanillic Acid ◽  
Syringic Acid ◽  
Atta Sexdens ◽  
Spectroscopic Evidence ◽  
Symbiotic Fungus ◽  
Atta Sexdens Rubropilosa ◽  
Leaf Cutting ◽  
Leucoagaricus Gongylophorus

The stems of Pilocarpus grandiflorus have afforded the new imidazole alkaloid 4,6-dehydro- 1,2,4,5-tetrahydro-2,5-dioxopilocarpine in addition to the 17 known compounds germanicol, β - amiryn, ocotillone, stigmast-4-en-3-one, 3β -hydroxy-stigmast-5-en-7-one, 6β -hydroxy-stigmast-4- en-3-one, β -sitosterol, scopoletin, 3-(1’,1’-dimethylallyl)-scopoletin, elisin, dictamine, 4-methoxy-2- quinolone, platydesmine, syringaresinol, syringaldehyde, syringic acid and vanillic acid. Their structures were elucidated on the basis of chemical and spectroscopic evidence. The phenolic compounds vanillic acid and syringaldehyde and the furoquinoline alkaloid platydesmine exhibited antifungal activity against Leucoagaricus gongylophorus, the symbiotic fungus of leaf-cutting ants (Atta sexdens rubropilosa).

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