Resistência parcial à brusone de genótipos de trigo comum e sintético nos estádios de planta jovem e de planta adulta

Cruz, Maria Fernanda Antunes; Prestes, A. M.; Maciel, João Leodato Nunes; Scheeren, P. L.

doi:10.1590/s1982-56762010000100004

Cited by 45 publications

(38 citation statements)

References 10 publications

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“…Pathogen diversity plays a major role in disease dynamics and, consequently, in the success of disease management strategies, including the development of cultivars resistant to the disease. Cruz et al (2010), studied 18 isolates of M. oryzae on 70 wheat genotypes and concluded that variation in the degree of susceptibility by genotypes, which ranged from 9.2% to 61.6% of the leaf area affected, was indicative of the difference in partial resistance of the genotypes studied. In the present investigation, the values of leaf area affected ranged from 2.8% to 66.7%, indicating the great susceptibility of the two Argentinian cultivars of wheat studied at the seedling stage to this new disease.…”

Section: Discussionmentioning

confidence: 99%

Pathogenicity of isolates ofMagnaporthespp. from wheat and grasses infecting seedlings and mature wheat plants in Argentina

et al. 2017

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Wheat blast of wheat (Triticum aestivum), caused by Magnaporthe oryzae pathotype triticum (MoT; anamorph Pyricularia oryzae) is a destructive disease in the South American countries of Brazil, Paraguay and Bolivia. In Argentina, the fungus was recently recorded on wheat and barley plants in the northeast part of the country, Buenos Aires and Corrientes Provinces, with a potential for spreading. This work aimed to study, for the first time, the morphocultural and pathogenic characteristics of Magnaporthe isolates collected from wheat and other herbaceous species in Argentina and three neighbouring countries (Paraguay, Brazil and Bolivia) and determine their aggressiveness on wheat varieties. Statistical differences among isolates, culture media, and development conditions were found for conidia colour, growth rate, size and sporulation rate. Pathogenicity tests performed on seedlings with 19 isolates of Magnaporthe spp. under greenhouse conditions showed a maximum disease severity of 55.3% and 66.7% for varieties BIOINTA 3004 and Baguette 18, respectively. Weed and grass isolates were infectious on wheat, demonstrating their potential epidemiological role on the disease. Spike disease severity was 34.6% for the host × pathogen interaction of BIOINTA 3004 × PY22. Observed symptoms included partial or total spike bleaching, and glume and rachis discolouration. The 1000‐grain weight was significantly reduced to 38.5% and 63.1% for cultivars BIOINTA 3004 and Baguette 18, respectively. The disease affected grain germination, which fell to 65.9% for seeds infected with the PYAR22 isolate. Symptoms observed in infected grains were partial spotting, grain softening, and rot symptoms with the presence of a greyish mould.

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Section: Discussionmentioning

confidence: 99%

Pathogenicity of isolates ofMagnaporthespp. from wheat and grasses infecting seedlings and mature wheat plants in Argentina

et al. 2017

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“…On each 100-ml plastic pot, leaf A 2 (HAUN, 1973;CRUZ et al, 2010) of each of ten grown seedlings was evaluated. Type and the severity of the predominant lesion were scored.…”

Section: Thirteen Oat Cultivarsmentioning

confidence: 99%

Relationship between blast severity on seedlings and panicles of Brazilian oat cultivars

et al. 2017

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Blast, caused by Pyricularia oryzae, threats black (Avena strigosa) and white (A. sativa) oats in Brazil. Little is known about the reaction of Brazilian oat cultivars to blast and if there is a relationship between the response of cultivars to the disease at seedling and adult plant stages. The goals of this research were to verify (a) the reaction of black and white Brazilian oat cultivars to infection of P. oryzae and (b) if the response to blast on seedling leaves and panicles was correlated. Seedlings and adult plants of 13 oat cultivars were inoculated with a conidial suspension of one P. oryzae isolate obtained from a black oat cultivar. The cultivars were classified according to blast severity on the leaf seedlings and panicles estimated by visual estimation. Two experiments were conducted for each one of the two evaluated stages. Cultivars with lower value to blast severity on seedling leaves were ‘UPFA Gaudéria’ (25.82%) and ‘UPF 18’ (24.88%) and, on panicles, ‘BRS Centauro’ (31.63%). Coefficients of Pearson, Spearman, and Kendall obtained from correlation analyses between blast severity on seedling leaves and panicles were -0.21232, -0.35714, and -0.30769, respectively (non-significant at 0.05). Lack of correlation between the responses of these oat cultivars to blast on seedling leaves and panicles be considered in the management of the disease in the field and the generation of new oat cultivars.

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“…However, in 1985, the first wheat infection was reported in Brazil, in the north of Paraná (IGARASHI et al, 1986), and since then it has been found in other producing regions of the country, as well as other Latin-American countries. Various aspects related to this disease have been the object of study, including optimal infection temperature, dissemination of the pathogen, application of fungicides, and even sources of resistance in wheat cultivars and host-pathogen interactions (URASHIMA et al, 2007;CRUZ et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Reaction of wheat plants and alternative hosts to Magnaporthe oryzae

et al. 2018

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Blast disease, caused by the fungus Magnaporthe oryzae, has a major impact on wheat farming. The study of plant responses to pathogens has improved the management of this disease. Moreover, it is important to identify potential host plants in the crops’ vicinity and to understand reactions caused by plant-pathogen interactions. The objective of this study was to assess the histopathology of wheat plants, Digitaria insularis and Digitaria sanguinalis inoculated with M. oryzae isolates obtained either rice or wheat plants. Thirty-three days after sowing, greenhouse-grown plants of all three species were inoculated with each M. oryzae isolate. The observed effects (48 hours after inoculation) differed depending on the particular interaction between each pathogen isolate-plant species pair. For instance, wheat and D. sanguinalis had the weakest defensive response against spore germination, production of melanized appressoria, and appressorial penetration, with average values above 87, 90, and 43%, respectively, for these events in these plants. Furthermore, germination and appressoria melanization were more aggressive in the rice isolate than in the wheat isolate. Additionally, evidence for a defensive response (such as cell death) was observed in wheat plants inoculated with rice isolates. However, such a response was absent in plants inoculated using wheat isolates, presumably because pathogen recognition failed.

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Resistência parcial à brusone de genótipos de trigo comum e sintético nos estádios de planta jovem e de planta adulta

Cited by 45 publications

References 10 publications

Pathogenicity of isolates ofMagnaporthespp. from wheat and grasses infecting seedlings and mature wheat plants in Argentina

Pathogenicity of isolates ofMagnaporthespp. from wheat and grasses infecting seedlings and mature wheat plants in Argentina

Relationship between blast severity on seedlings and panicles of Brazilian oat cultivars

Reaction of wheat plants and alternative hosts to Magnaporthe oryzae

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