Histopathology of durable adult plant resistance to leaf rust in the Brazilian wheat variety Toropi

Wesp-Guterres, Caroline; Martinelli, José Antônio; Graichen, Felipe André Sganzerla; Chaves, Márcia Soares

doi:10.1007/s10658-013-0232-5

Cited by 21 publications

(28 citation statements)

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“…Moreover, the percentage of haustoria formed in BABA-treated plant was significantly reduced at 72 hai. This was also observed in durable resistance to leaf rust in the Brazilian wheat variety Toropi, where the number of haustoria formed was significantly reduced (Wesp-Guterres et al 2013). Being effective at two important stages of fungal development could explain the infection type observed in BABA-treated plants, showing no to very small uredia formation surrounded by chlorotic flecks.…”

Section: Discussionmentioning

confidence: 67%

“…Primed plants recognize the pathogen and produce reactive oxygen species (ROS) and deposit callose at the infection sites (Balmer et al 2015). This rapid local oxydative burst generates, among other, hydrogen peroxide (H 2 O 2 ) during pre-haustorial resistance against wheat leaf rust caused by P. triticina (Wesp-Guterres et al 2013; Serfling et al 2016). Callose is an effective barrier that is induced at the sites of attack during the early stages of pathogen invasion (Luna et al 2011).…”

Section: Introductionmentioning

confidence: 99%

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Histopathological aspects of induced resistance by Pseudomonas protegens CHA0 and β-aminobutyric acid in wheat against Puccinia triticina

Bellameche

Jasim

Mauch‐Mani

et al. 2020

Preprint

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8After perception of specific biotic or abiotic stimuli, such as root colonization by rhizobacteria or 9 selected chemicals, plants are able to enhance their basal resistance against pathogens. Due to its 10 sustainability, such induced resistance is highly valuable for disease management in agriculture. Here 11 we study an example of resistance against wheat-leaf rust induced by Pseudomonas protegens CHA0 12 (CHA0) and β-aminobutyric acid (BABA), respectively. Seed dressing with CHA0 reduced the 13 number of sporulating pustules on the leaves and the expression of resistance was visible as necrotic 14 or chlorotic flecks. Moreover, a beneficial effect of CHA0 on growth was observed in wheat 15 seedlings challenged or not with leaf rust. BABA was tested at 10, 15 and 20 mM and a dose-16 dependent reduction of leaf rust infection was observed with the highest level of protection at 20 mM. 17However, BABA treatment repressed plant growth at 20 mM. Balancing between BABA-impact on 18 plant growth and its protective capacity, we selected 15 mM as suitable concentration to protect 19 wheat seedlings against leaf rust with the least impact on vegetative growth. To understand the 20 mechanisms behind the observed resistance, we have studied the histological aspects of the fungal 21 infection process. Our results showed that the p re-entry process was not affected by the two 22 resistance inducers. However, both treatments reduced fungal penetration and haustoria formation. 23The timing and the amplitude of the resistance reactions was different after bacterial or chemical 24 induction, leading to different levels of resistance to leaf rust. During fungal colonization of the 25 tissues, a high deposition of callose and the accumulation of H 2 O 2 in both CHA0-and BABA-treated 26 plants pointed to an important contribution to resistance. 27 Leaf rust, callose deposition, hydrogen peroxide (H 2 O 2 ), plant resistance inducers 29 INTRODUCTION 30 Plants dispose of several layers of sophisticated defense mechanisms to defend themselves against 31 pathogen attack. The first layer is given by preformed physical and chemical barriers that impede the 32 pathogen to penetrate into the plant and to initiate infection (Ferreira et al. 2006). Once the presence 33 of the pathogen has been detected, the plant activates further chemical and physical barriers that 34 block or at least delay the attack (second layer; Jones and Dangl (2006)). Defense success depends 35 on the readiness of the plant to detect the pathogen. In the case of the interaction between wheat and 36 the leaf rust pathogen (Puccinia triticina), the plant can detect specific fungal avirulence factors 37 (elicitors) with leaf rust resistance genes (Lr). This gene-by-gene interaction is a very rapid 38 recognition-reaction event leading to an elevated degree of resistance against the disease. However, 39 the avirulence patterns can change and the pathogen may become undetectable by the plant. This 40 2 resistance breakdown happened recently with yellow rust (Hovmøller ...

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Section: Discussionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Histopathological aspects of induced resistance by Pseudomonas protegens CHA0 and β-aminobutyric acid in wheat against Puccinia triticina

Bellameche

Jasim

Mauch‐Mani

et al. 2020

Preprint

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“…Os genes envolvidos na resistência de planta adulta (RPA) são efetivos apenas no estádio de planta adulta. Essa resistência é caracterizada por genes de resistência de efeito menor e é dita de natureza parcial, a qual permite o desenvolvimento da doença, mas sem causar redução econômica ao rendimento da cultura (61). Um exemplo é o gene Lr34, o qual codifica uma proteína transmembrana, pertencente à família de transportadores ABC, que utiliza a hidrólise do ATP para transportar vários substratos através da membrana celular (55).…”

Section: Principais Genes E Seus Mecanismos De Resistência Em Cereaisunclassified

Mecanismos de defesa do trigo contra a ferrugem da folha por genes e proteínas

et al. 2017

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O agente causal da ferrugem da folha do trigo é o fungo Puccinia triticina. Essa doença causa danos elevados que podem comprometer a produtividade da cultura do trigo em até 80%, quando a infecção é intensa antes do florescimento e do enchimento de grãos. A utilização de cultivares resistentes é a melhor estratégia de controle da ferrugem da folha. Porém, devido à variabilidade do patógeno, a resistência dos genótipos é superada em até três anos após o seu lançamento. Para se defender da infecção do patógeno a planta desencadeia Finger, G.; Heckler, L.I.; Silva, G.B.P.; Chaves, M.S.; Martinelli, J.A. Mecanismos de defesa do trigo contra a ferrugem da folha por genes e proteínas. Summa Phytopathologica, v.43, n.4, p.354-358, 2017. Palavras-chave:Triticum aestivum, Puccinia triticina, proteômica, resistência, infecção. RESUMOmecanismos de defesa, os quais têm a finalidade de evitar que o fungo colonize os tecidos do hospedeiro. Esses mecanismos de defesa podem estar associados com a expressão de genes que possuem a função de codificar proteínas envolvidas na resistência. Esta revisão discute a importância da interação plantapatógeno bem como das proteínas envolvidas. Também apresenta as principais técnicas de proteômica que visam identificar e quantificar as diferentes proteínas expressas nas células vegetais. ABSTRACTThe fungus Puccinia triticina is the causal agent of wheat leaf rust. This disease causes great damages, which may compromise wheat crop yields by up to 80% when the infection is intense before flowering and grain filling. The use of resistant cultivars is the best strategy to control leaf rust. However, due to the pathogen variability, genotype resistance is easily overcome within three years under field conditions. To defend against the pathogen infection, the plant triggers defense mechanisms, which aim to prevent the fungus from colonizing the host tissues. Such defense mechanisms may be associated with the expression of genes that have a role in encoding proteins involved in resistance. In this review, the importance of both the plant-pathogen interaction and the role of involved proteins is discussed. The main proteomic techniques to identify and quantify the different proteins expressed in plant cells are also presented. Triticum aestivum, Puccinia triticina, proteomics, resistance, infection. A cultura do trigo (Triticum aestivum L.) possui grande importância no setor econômico mundial. Dentre os cereais mais produzidos no mundo, ocupa a terceira posição, superado apenas pelo milho e o arroz. Considerado a segunda cultura cerealífera, o trigo tem grande importância para a alimentação humana e está entre as primeiras culturas domesticadas (26). O grão de trigo é rico em nutrientes essenciais para o homem, possuindo em torno de 60 a 80% de carboidratos, vitaminas B e E, e proteínas (3). Cerca de 30% da população mundial encontra no cereal, e em seus derivados, a fonte primária de energia para sua dieta (15). Keywords:Os principais países produtores de trigo são China, União Européia, Estados...

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“…In a review on this form of resistance, Develey-Rivi ere and Galiana [5] discussed changes in R gene expression as well as up-regulation of genes involved in defense expression (e.g PR protein genes). In this issue, Casassola et al [6] et al provide some new insight into age related resistance in the wheat cultivar Toropi to the leaf rust pathogen Puccinia triticina.…”

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confidence: 99%

“…This suggested that the resistance in the adult leaves was expressed in both temporally and spatially with respect to the infection process. In this issue of PMPP, Casassola et al [6] examined host gene expression changes over time in response to inoculation with P. triticina. The authors examined ten "infection-related" and five "defense-related" genes.…”

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confidence: 99%

Being an adult plant sometimes has its advantages

Hammerschmidt

2015

Physiological and Molecular Plant Pathology

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Histopathology of durable adult plant resistance to leaf rust in the Brazilian wheat variety Toropi

Cited by 21 publications

References 48 publications

Histopathological aspects of induced resistance by Pseudomonas protegens CHA0 and β-aminobutyric acid in wheat against Puccinia triticina

Histopathological aspects of induced resistance by Pseudomonas protegens CHA0 and β-aminobutyric acid in wheat against Puccinia triticina

Mecanismos de defesa do trigo contra a ferrugem da folha por genes e proteínas

Being an adult plant sometimes has its advantages

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