Resistance inducers applied alone or in association with fungicide for the management of leaf rust and brown eye spot of coffee under field conditions

2019 ◽  
Vol 167 (7-8) ◽  
pp. 430-439 ◽  
Author(s):  
Joyce A. G. Silva ◽  
Mário L. V. Resende ◽  
Ana C. A. Monteiro ◽  
Moises A. Pádua ◽  
Leonor Guerra‐Guimarães ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Field Conditions ◽  
Resistance Inducers ◽  
Brown Eye Spot

scholarly journals Identification of leaf rust resistance genes Lr34 and Lr46 in common wheat (Triticum aestivum L. ssp. aestivum) lines of different origin using multiplex PCR

2021 ◽  
Vol 16 (1) ◽  
pp. 172-183
Author(s):  
Agnieszka Tomkowiak ◽  
Roksana Skowrońska ◽  
Michał Kwiatek ◽  
Julia Spychała ◽  
Dorota Weigt ◽  
...  
Keyword(s):  
Multiplex Pcr ◽  
Leaf Rust ◽  
Common Wheat ◽  
Fungal Pathogens ◽  
Rust Resistance ◽  
Leaf Rust Resistance ◽  
Field Conditions ◽  
Pcr Marker ◽  
Specific Sequence ◽  
Cereal Species

Abstract Leaf rust caused by the fungus Puccinia recondita f. sp. tritici is one of the most dangerous diseases of common wheat. Infections caused by fungal pathogens reduce the quantity and quality of yields of many cereal species. The most effective method to limit plant infection is to use cultivars that show rust resistance. Genetically conditioned horizontal-type resistance (racial-nonspecific) is a desirable trait because it is characterized by more stable expression compared to major (R) genes that induce racially specific resistance, often overcome by pathogens. Horizontal resistance is conditioned by the presence of slow rust genes, which include genes Lr34 and Lr46. This study aimed to identify markers linked to both genes in 64 common wheat lines and to develop multiplex PCR reaction conditions that were applied to identify both genes simultaneously. The degree of infestation of the analyzed lines was also assessed in field conditions during the growing season of 2017 and 2018. Simple sequence repeat anchored-polymerase chain reaction (SSR-PCR) marker csLV was identified during analysis in line PHR 4947. The presence of a specific sequence has also been confirmed in multiplex PCR analyses. In addition to gene Lr34, gene Lr46 was identified in this genotype. Lines PHR 4947 and PHR 4819 were characterized by the highest leaf rust resistance in field conditions. During STS-PCR analyses, the marker wmc44 of gene Lr46 was identified in most of the analyzed lines. This marker was not present in the following genotypes: PHR 4670, PHR 4800, PHR 4859, PHR 4907, PHR 4922, PHR 4949, PHR 4957, PHR 4995, and PHR 4997. The presence of a specific sequence has also been confirmed in multiplex PCR analyses. Genotypes carrying the markers of the analyzed gene showed good resistance to leaf rust in field conditions in both 2017 and 2018. Research has demonstrated that marker assisted selection (MAS) and multiplex PCR techniques are excellent tools for selecting genotypes resistant to leaf rust.

scholarly journals IPR 103 - Rustic dwarf arabic coffee cultivar more adapted to hot regions and poor soils

2013 ◽  
Vol 13 (1) ◽  
pp. 95-98 ◽  
Author(s):  
Tumoru Sera ◽  
Gustavo Hiroshi Sera ◽  
Luiz Carlos Fazuoli
Keyword(s):  
Leaf Rust ◽  
Partial Resistance ◽  
Field Conditions ◽  
Medium Size ◽  
Coffee Leaf Rust ◽  
Dwarf Cultivar

'IPR 103' was derived from a cross between "Catuaí" and "Icatu". 'IPR 103' is a medium size dwarf cultivar with high rusticity, partially resistant to coffee leaf rust with late ripening. This cultivar is more adapted to hot regions and poor soils. It presents partial resistance to necrosis and mummification of young fruits on field conditions.

scholarly journals Agronomic performance and adaptability of arabic coffee resistant. To leaf rust in the central brasilian savanna

2018 ◽  
Vol 13 (1) ◽  
pp. 41
Author(s):  
Adriano Delly Veiga ◽  
Omar Cruz Rocha ◽  
Antônio Fernando Guerra ◽  
Gabriel Ferreira Bartholo ◽  
Gustavo Costa Rodrigues ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Integrated Control ◽  
Block Design ◽  
Production Costs ◽  
Agronomic Performance ◽  
Breeding Programs ◽  
Resistant Cultivars ◽  
Randomized Block Design ◽  
Plagiotropic Branches ◽  
Brown Eye Spot

Breeding programs and later indication of rust resistant cultivars for different environments and crops systems, in the concept of diseases integrated control, reach out for productivity raising and reduced production costs. The aim of this work was to evaluate the agronomic performance and adaptability of new <em> Coffea arabica </em> cultivars and progenies resistant to leaf rust in Central Brazilian Savanna. The experiment has been conducted since 2008 in an experimental area of Embrapa Hortaliças. Twenty three resistant cultivars, four progenies and three susceptible cultivars as controls, were assessed in a complete randomized block design with four replicates. The following traits were analyzed: plant height, stem diameter, canopy projection, number of plagiotropic branches, yield, grains percentage retained in sieves above 17, grain ripening and diseases resistance. Catucaí 2SL, Sacramento and Araponga stood out in vegetative growth. The highest yields are observed for IPR 103, Obatã 1669-20, Palma II, Sabiá 398 and Acauã, with values higher than 60 sacks per hectare. Among all these cultivars is observed high resistance to rust leaf and greater susceptibility to brown eye spot in the cultivar Acauã, for the place and period of evaluation.

scholarly journals Genome wide association mapping through 90K SNP array against Leaf rust pathogen in bread wheat genotypes under field conditions

2021 ◽  
pp. 101628
Author(s):  
Hafiz Ghulam Muhu-Din Ahmed ◽  
Muhammad Nouman Iqbal ◽  
Muhammad Arslan Iqbal ◽  
Yawen Zeng ◽  
Aziz Ullah ◽  
...  
Keyword(s):  
Association Mapping ◽  
Leaf Rust ◽  
Bread Wheat ◽  
Snp Array ◽  
Field Conditions ◽  
Genome Wide Association ◽  
Wheat Genotypes ◽  
Genome Wide ◽  
Rust Pathogen ◽  
90K Snp Array

scholarly journals Evaluation of CIMMYT Wheat Lines under Egyptian Field Conditions to Identify New Sources of Resistance to Leaf Rust

2020 ◽  
Vol 9 (2) ◽  
pp. 105-122
Author(s):  
Walid Mohamed El-Orabey ◽  
Hosam Mohamed Awad ◽  
Sabry Ibrahim Shahin ◽  
Yasser Ahmed El-Gohary
Keyword(s):  
Leaf Rust ◽  
Agricultural Research ◽  
Resistance Index ◽  
Leaf Rust Resistance ◽  
Field Conditions ◽  
Research Station ◽  
Sources Of Resistance ◽  
Wheat Genotypes ◽  
Growing Seasons ◽  
Progress Curve

Leaf rust caused by Puccinia triticina Eriks. is a fungal disease of wheat (Triticum aestivum L.), which causes considerable yield loss. Host resistance is the most effective and economical method to minimize yield losses caused by leaf rust. The current research was planned to evaluate the response of 93 wheat genotypes lines selected from 716 wheat genotypes delivered to Egypt by International Maize and Wheat Improvement Center (CIMMYT). These genotypes were evaluated against leaf rust resistance under field conditions at two locations i.e. Behira governorate (Itay El-Baroud Agricultural Research Station) and Menoufia governorate during three successive growing seasons i.e. 2017/2018, 2018/2019 and 2019/2020. Results of the current study showed that 47 wheat genotypes were resistant and had the lowest values of final rust severity (FRS %), average coefficient of infection (ACI) and area under disease progress curve (AUDPC). Also, these genotypes showed desirable/acceptable relative resistance index (RRI) at the two locations during the three growing seasons of the study. Therefore, we can select these genotypes as resistant lines in the breeding program for the resistance of leaf rust.

scholarly journals Resistance to leaf rust in coffee carrying S H3 gene and others S H genes

2007 ◽  
Vol 50 (5) ◽  
pp. 753-757 ◽  
Author(s):  
Gustavo Hiroshi Sera ◽  
Tumoru Sera ◽  
Dhalton Shiguer Ito ◽  
José Alves de Azevedo ◽  
João Siqueira da Mata ◽  
...  
Keyword(s):  
Leaf Rust ◽  
Resistance Genes ◽  
Durable Resistance ◽  
Virulence Gene ◽  
Field Conditions

The aim of this work was to evaluate the resistance to rust in coffee carrying S H3 gene and other S H genes. Twenty one CIFC’s coffee trees with several resistance genes S H were evaluated in field conditions. All the evaluated coffees carrying Sh3 gene presented resistance to the rust. It was possible that rust races with the virulence gene v3 in the Paraná State didn’t exist. The S H3 gene in combination with genes S H5, S H6, S H7, S H8, S H9 and S H? would be very important to obtain cultivars with more durable resistance to the rust.

Evaluation of Electrolysed Oxidizing Water for European Pear Rust Management on Pear (Pyrus cv. Conference)

2021 ◽  
Vol 47 (3) ◽  
pp. 116-122
Author(s):  
Glynn Percival
Keyword(s):  
Leaf Rust ◽  
Chlorophyll Content ◽  
Field Trials ◽  
Field Conditions ◽  
Compound A ◽  
Leaf Chlorophyll ◽  
Foliar Pathogen ◽  
Rust Severity ◽  
Pear Trees ◽  
Foliar Pathogens

Pear rust is a foliar pathogen of ornamental and fruiting pear trees. Unmanaged, yield and aesthetic losses can be severe. Over-reliance on synthetic fungicides means novel means of pathogen management are required. Field trials were conducted using pear (Pyrus cv. Conference) to assess the efficacy of electrolysed oxidizing water (EO water) as a rust protective compound. A synthetic fungicide (boscalid + pyraclostrobin) spray program used for pear rust management was included for comparison. Each treatment was applied 4 times prior to the visible appearance of rust (April through June, i.e., preventatively). Studies were conducted in 2017 and repeated in 2018. Efficacy of EO water as a rust protectant compound was confirmed (increased leaf chlorophyll content, reduced leaf rust incidence and severity). The degree of leaf rust severity protection conferred was not statistically different from a boscalid + pyraclostrobin spray program. Results suggest 4 spray applications of EO water provides a useful addition to existing methods of pear rust management under field conditions that may have applicability against other foliar pathogens.

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