Fungos causadores de ferrugens (Uredinales) em áreas de cerrado no estado de São Paulo, Brasil

Júnior, Aníbal Alves de Carvalho; Hennen, Joe F.; Hennen, Mary M. Winkler; Figueiredo, M. B.

doi:10.1590/2175-7860200859101

Rodriguésia

2008

DOI: 10.1590/2175-7860200859101

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Fungos causadores de ferrugens (Uredinales) em áreas de cerrado no estado de São Paulo, Brasil

Aníbal Alves de Carvalho Júnior

Joe F. Hennen

Mary M. Winkler Hennen

et al.

Abstract: RESUMO O estudo das Uredinales de tres áreas de cerrado, nas Estações Experimentais de Moji-Mirim-SP, de Moji-Guaçu-SP e de Luís Antonio-SP, foi realizado com o objetivo de ampliar o conhecimento sobre esse importante grupo de patógenos vegetais. Estas áreas contêm remanescentes de vegetação de cerrados no estado de São Paulo e representam uma amostra importante da biodiversidade deste ecossistema. Com base em 1.176 espécimes de Uredinales coletados entre 1975 e 1999, foram identificados 128 gêneros de plantas… Show more

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Species richness, taxonomy and peculiarities of the neotropical rust fungi: are they more diverse in the Neotropics?

Berndt

2012

Biodivers Conserv

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The species richness of rust fungi (Pucciniales or Uredinales) in the neotropics is reviewed. Species numbers are presented for all neotropical countries and rust-plantratios calculated. It is discussed whether the ratio for a given region can be explained by the species richness of vascular plants alone or whether it is caused by additional factors. In the first case, ratios should apply globally and vary only slightly; in the second case, more diverging ratios are expected. Observed ratios ranged between 1:16 and 1:124 in the neotropics. The large differences are certainly influenced by unequal levels of investigation, rendering interpretation difficult. Differences seem also to be influenced by the taxonomic composition of floras regarding the percentage of host families or genera bearing different numbers of rust species. This indicates that rust species richness is not driven solely by plant species richness. Ratios calculated for Switzerland, Austria and Japan are distinctly higher than for the neotropics indicating that certain temperate regions are proportionally richer in rust fungi than the neotropics. Uredinial states and short-cycled rust species prevail in the neotropics. The preponderance of uredinial states may be due to the heterogeneous spatial composition of certain vegetation types in the wet tropics. Shortcycled rusts may be adapted to a pronounced seasonality that can be encountered in many drier neotropical biomes. Future research needs to fill our knowledge gaps on the taxonomy and ecology of neotropical rust fungi are discussed.

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Species richness, taxonomy and peculiarities of the neotropical rust fungi: are they more diverse in the Neotropics?

Berndt

2012

Biodivers Conserv

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Assessment of the microcyclic rust Puccinia lantanae as a classical biological control agent of the pantropical weed Lantana camara

et al. 2021

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Dynamics of cell wall components and histochemical profile of a rust fungi gall (Basidiomycota: Pucciniales) on Byrsonima variabilis A.Juss. (Malpighiaceae)

et al. 2023

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Context An obligate biotrophic parasitism with a rust fungus led to gall formation on Byrsonima variabilis. Aims The hypothesis that the host leaf–rust fungi interaction alters the dynamics of plant cell walls and the histochemical profile toward favouring the plant cell-to-fungi cell translocation of metabolites is tested. Methods Gall samples were sectioned and submitted to anatomical, histometric, histochemical, and immunocytochemical techniques to evaluate structural alterations and the detection of primary and secondary metabolites, as well as the epitopes of glycoproteins, pectins, and hemicelluloses. Key results Fungi gall development results in the hypertrophy of the stomatal chamber and the hyperplasia of epidermis and spongy parenchyma. The cell-to-cell translocation of metabolites from plant mesophyll cells toward the rust fungi gall is favoured by the epitopes of homogalacturonans (HGs) and (1 → 5) α-l-arabinans detected in the hyphae passage sites in the pycnial and aecial stages. The arabinogalactan-proteins (AGPs) may favour mycelial nutrition and differentiation, and cell wall adhesion. HGs and arabinans confer porosity to mesophyll cell walls, which favours the traffic of molecules toward the rust fungi gall. Conclusions The unexpected labelling of AGPs, HGs, and arabinans in fungi cell walls is a novelty regarding the plant–fungi interaction. The primary metabolites detected in rust fungi support hyphae growth and spore maturation. Implications The immunolabelling of host plant cell wall components on fungi cell walls indicates the integrative role of some plant cell wall components in the biological process of pathogen colonisation in leaf tissues.

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Fungos causadores de ferrugens (Uredinales) em áreas de cerrado no estado de São Paulo, Brasil

Cited by 3 publications

References 17 publications

Species richness, taxonomy and peculiarities of the neotropical rust fungi: are they more diverse in the Neotropics?

Species richness, taxonomy and peculiarities of the neotropical rust fungi: are they more diverse in the Neotropics?

Assessment of the microcyclic rust Puccinia lantanae as a classical biological control agent of the pantropical weed Lantana camara

Dynamics of cell wall components and histochemical profile of a rust fungi gall (Basidiomycota: Pucciniales) on Byrsonima variabilis A.Juss. (Malpighiaceae)

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