Development of the Uredinial Thallus and Sorus in the Orange Coffee Rust Fungus,Hemileia vastatrix

1984 ◽  
Vol 74 (6) ◽  
pp. 714 ◽  
Author(s):  
J. W. McCain
Keyword(s):  
Rust Fungus ◽  
Hemileia Vastatrix ◽  
Coffee Rust

scholarly journals Manganese Phosphite in Coffee Defence against Hemileia vastatrix , the Coffee Rust Fungus: Biochemical and Molecular Analyses

2016 ◽  
Vol 164 (11-12) ◽  
pp. 1043-1053 ◽  
Author(s):  
Ana Cristina Andrade Monteiro ◽  
Mário Lúcio Vilela de Resende ◽  
Thaís Cainã Teixeira Valente ◽  
Pedro Martins Ribeiro Junior ◽  
Vanessa Foresti Pereira ◽  
...  
Keyword(s):  
Rust Fungus ◽  
Hemileia Vastatrix ◽  
Molecular Analyses ◽  
Coffee Rust

Non-host resistance responses of Arabidopsis thaliana to the coffee leaf rust fungus (Hemileia vastatrix)

Botany ◽  
2010 ◽  
Vol 88 (7) ◽  
pp. 621-629 ◽  
Author(s):  
Helena Gil Azinheira ◽  
Maria do Céu Silva ◽  
Pedro Talhinhas ◽  
Clara Medeira ◽  
Isabel Maia ◽  
...  
Keyword(s):  
Arabidopsis Thaliana ◽  
Leaf Rust ◽  
Rust Fungus ◽  
Hemileia Vastatrix ◽  
Callose Deposition ◽  
Mesophyll Cells ◽  
Model Plant ◽  
Heterologous System ◽  
Coffee Leaf Rust ◽  
Model Plant Arabidopsis Thaliana

Leaf rust, caused by Hemileia vastatrix Berk & Broome, is the most destructive fungal disease of coffee. In the absence of a suitable gene validation system in coffee, the objective of this study was to investigate whether the model plant Arabidopsis thaliana (L.) Heynh. may be used as a heterologous system for the molecular dissection of coffee responses to leaf rust. Histological examination of A. thaliana (Col-0) leaves inoculated with H. vastatrix (race II) showed that by 24 h after inoculation (hai), H. vastatrix uredospores differentiated appressoria and penetrated the stomata, but failed to form haustoria. Arabidopsis thaliana cellular resistance responses included hypersensitive-like response (HR) of stomata guard cells together with accumulation of phenolic compounds and callose deposition in walls of epidermal and mesophyll cells. Results indicate that H. vastatrix infection triggered the induction of a set of defence-related genes peaking at 18 and 42 hai. The non-host HR triggered by H. vastatrix in the model plant A. thaliana makes it usable to infer the function of coffee genes involved in pre-haustorial rust resistance.

scholarly journals Dispersal of Coffee Rust Hemileia vastatrix B. et Br.

Nature ◽  
1962 ◽  
Vol 194 (4835) ◽  
pp. 1296-1296 ◽  
Author(s):  
F. J. NUTMAN ◽  
F. M. ROBERTS
Keyword(s):  
Hemileia Vastatrix ◽  
Coffee Rust

A Self-Inhibitor in Uredospores of the Coffee Rust Fungus

1974 ◽  
Vol 64 (1) ◽  
pp. 71 ◽  
Author(s):  
Maria Raphaela Musumeci
Keyword(s):  
Rust Fungus ◽  
Coffee Rust

Virulence genes of new population of coffee rust (Hemileia vastatrix) affecting coffee variety 'Lempira', in Honduras; resistant and susceptible varieties.

2021 ◽  
pp. 338-343
Author(s):  
Yonis Morales ◽  
Rolando Grajeda
Keyword(s):  
Relative Humidity ◽  
Virulence Genes ◽  
Central American ◽  
Virulence Determinants ◽  
Sources Of Resistance ◽  
Hemileia Vastatrix ◽  
Leaf Discs ◽  
Coffee Rust ◽  
Temperature Conditions ◽  
Resistant Varieties

Abstract The coffee variety 'Lempira', released in Honduras in 1998, was classified 100% resistant to races I and II of coffee rust identified by Portugal's Centre for Research into Coffee Rusts (Centro de Investigação das Ferrugens do Cafeeiro) (CIFC) in 1997. However, since 2007, the disease has been reported in seed foundation plots and producer farms, the most recent epidemic report being in April 2016 in Vegas de Jalan, Juticalpa Olancho, affecting 210 ha. Since this variety constitutes 45% of the cultivated area under coffee in the country, there is a need to identify the virulence genes of the new strain and to determine the resistance and susceptibility of other cultivated varieties. For these purposes, mass samples of rust were inoculated on leaf discs of the differential clones 1343/269, 110/5, 147/1, 152/3, 33/1, 419/20, 832/1 and 832/2, together with 87/1, 1006/10, 420/10 and 420/2 from the Federal University of Vicosa, as well as on the two main cultivated resistant varieties ('Parainema' and 'IHCAFE- 90'), and seven promising genotypes, under controlled temperature conditions and relative humidity. After 20-60 days of inoculation, seven virulence genes were identified (v1, v2, v4, v5, v6, v7, v9), of which v1, v4, v6, v7 and v9 had not been reported in Honduras previously. It is inferred that this rust population arose by recombination of race v5 with v6, v7 or v9. Races with 3, 4, 5, 6 or 7 virulence determinants were identified as the most complex and aggressive strains described but they lacked the v3 and v8 determinants. In addition, it was found that 'Parainema', 'H27', 'T5296-170', 'Central American', 'Pacamara yellow' and 'Anacafe-14' are resistant because they possess the SH8 gene, absent from 'Lempira'. 'IHCAFE-90' and 'Obatá' showed 20% susceptibility, and 'Ruiru 11' was susceptible. The results reveal the diversity of rust virulence genes in Honduras and emphasize the importance of the SH3 and SH8 genes as sources of resistance.

Monitoring of the early molecular resistance responses of coffee (Coffea arabica L.) to the rust fungus (Hemileia vastatrix) using real-time quantitative RT-PCR

Plant Science ◽  
2006 ◽  
Vol 170 (6) ◽  
pp. 1045-1051 ◽  
Author(s):  
D. Ganesh ◽  
A.-S. Petitot ◽  
M.C. Silva ◽  
R. Alary ◽  
A.-C. Lecouls ◽  
...  
Keyword(s):  
Real Time ◽  
Coffea Arabica ◽  
Rust Fungus ◽  
Rt Pcr ◽  
Hemileia Vastatrix ◽  
Coffea Arabica L

scholarly journals Agronomic characterization and responses to coffeeleaf rust in coffee progenies resistant to the gall nematode Meloidogyne exigua

2017 ◽  
Vol 38 (2) ◽  
pp. 671
Author(s):  
Ramiro Machado Rezende ◽  
Gladyston Rodrigues Carvalho ◽  
Alex Mendonça de Carvalho ◽  
Antonio Nazareno Mendes ◽  
Sônia Maria Lima Salgado ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Rust Fungus ◽  
Block Design ◽  
Coffee Production ◽  
Hemileia Vastatrix ◽  
Randomized Block Design ◽  
Coffee Beans ◽  
Coffee Leaf Rust ◽  
Specialty Coffee ◽  
Good Potential

The aim of this study was to determine agronomic characteristics and responses to the coffee leaf rust fungus (Hemileia vastatrix Berk. et Br.) in coffee progenies resistant to the gall nematode Meloidogyne exigua. The experiment was conducted in December 2000 at Ouro Verde Farm (FazendaOuro Verde), located in the municipality of Campos Altos – Minas Gerais (MG). Ten F3:4 progenies were evaluated. They were derived from crosses between CIFC 2570 Timor Hybrid selections and Catuaí cultivars known to be resistant to M. exigua. The Catuaí Vermelho IAC 99 cultivar served as a control. A randomized block design with three replicates was used. In total, there were thirty-three plots consisting of eight plants each. The following characteristics were assessed between the harvests of 2011/2012 and 2014/2015: (a) yield expressed as processed coffee bags ha-1; (b) rust incidence and severity; (c) vegetative vigor; (d) percentage of coffee fruits at the “cherry” stage; (e) percentage of floaters; (f) crown diameter; (g) percentage of coffee beans of size sieve 17 and higher; and (h) sensory analysis of the coffee beverage. The results indicated the following: (a) the H514-7-14-2, H514-7-4-5, H493-1-2-2, H514-7-16-3, H514-7-8-11, H518-2-10-1, and H514-5-2-4 progenies were the most productive; (b) all progenies showed promising resistance to coffee leaf rust; (c) all genotypes had the potential for specialty coffee production; (d) the H493-1-2-2 progeny showed resistance both to rust and the nematode, and has good potential for specialty coffee production; and (e) the yields of the H514-7-8-11, H518-2-10-1, H514-5-2-4, H514-7-16-3, H514-7-14-2, H514-7-4-5, and H493-1-2-2 progenies were significantly higher than that of the Catuaí IAC 99 control.

scholarly journals Cryptosexuality and the Genetic Diversity Paradox in Coffee Rust, Hemileia vastatrix

PLoS ONE ◽  
2011 ◽  
Vol 6 (11) ◽  
pp. e26387 ◽  
Author(s):  
Carlos Roberto Carvalho ◽  
Ronaldo C. Fernandes ◽  
Guilherme Mendes Almeida Carvalho ◽  
Robert W. Barreto ◽  
Harry C. Evans
Keyword(s):  
Genetic Diversity ◽  
Hemileia Vastatrix ◽  
Coffee Rust

scholarly journals Incidence-Severity Relationships in the Pathosystem Coffea arabica-Hemileia vastatrix

Plant Disease ◽  
1999 ◽  
Vol 83 (2) ◽  
pp. 186-188 ◽  
Author(s):  
R. Silva-Acuña ◽  
L. A. Maffia ◽  
L. Zambolim ◽  
R. D. Berger
Keyword(s):  
Leaf Area ◽  
Disease Severity ◽  
Host Resistance ◽  
Coffea Arabica ◽  
Data Sets ◽  
Independent Data ◽  
Hemileia Vastatrix ◽  
Fungicide Treatment ◽  
Coffee Rust

Incidence-severity relationships for coffee rust were studied to determine if the easily assessed incidence could be used to evaluate host resistance and fungicide treatment. At two locations in each of 3 years, the incidence of rust on 300 leaves was compared with two assessments of severity: (i) the average number of sporulating pustules per leaf, and (ii) the estimated leaf area with rust. For nine or 10 assessments in time at one location and pooled over 3 years, the average number of sporulating pustules per leaf (Y sp) was well related with the incidence of leaves with rust (X) as Y sp = 0.02982+ 0.017035X +0.000573X 2; R 2 = 0.87. The leaf area with rust (Y la) was also well related with incidence of leaves with rust as Y la = 0.001 − 0.01076X +0.008376X 2; R 2 = 0.92. For two independent data sets from a second location obtained over two seasons, the above models satisfactorily fit the relationships for the average sporulating pustules per leaf (R 2 = 0.97 and 0.96) and for the estimated leaf area with rust (R 2 = 0.95 and 0.98). Therefore, the readily determined incidence can be used to estimate both measures of disease severity of coffee rust.

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