Reprodução Sexuada em Pyricularia oryzae

Moreira, Silvino Intra; Ceresini, Paulo Cézar; Alves, Eduardo

doi:10.1590/0100-5405/2067

Cited by 9 publications

(7 citation statements)

References 57 publications

(60 reference statements)

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“…The sowing date is among the main factors affecting the grain yield of irrigated rice in southern Brazil (Freitas et al 2008). In southern Brazil, in general, the highest yields of irrigated rice are obtained when medium and early cycle cultivars are sown from October until the first half of November (Menezes et al 2013), because this sowing date makes it possible to synchronize the highest demand of solar radiation by rice plants with the largest supply available from the environment (Yoshida and Parao 1976). Thus, with late sowing, in addition to allowing greater occurrence of diseases, there is also less photosynthetic activity of the plant due to the lower supply of solar radiation and, consequently, a reduction of the productive potential.…”

Section: Discussionmentioning

confidence: 99%

Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil

Ogoshi

Carlos

Waldow

et al. 2020

J Soil Sci Plant Nutr

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In recent decades, nitrogen fertilization rates have increased significantly in irrigated rice fields in southern Brazil. However, there is a gap in knowledge concerning the use of these high rates of nitrogen fertilization in cultivars with a high yield potential, and susceptible to rice blast. We therefore conducted a field experiment in the 2014/2015 and 2015/2016 crop year to evaluate blast severity, plant tissue nutrition, and yield and grain quality with increasing nitrogen fertilization levels in a rice blast-susceptible cultivar (Guri Inta CL). The experiment had three factors, with factor 1: N doses (0, 60, 120, and 180 kg ha −1), factor 2: sowing dates (early and late), and factor 3: with and without fungicide application. The experimental design was randomized blocks with four replications. The area under the disease progress curve was positively influenced by the increase of N rates in the two crops years. Grain yield had a negative quadratic effect as a function of N rates. Increased N levels reduced the thousand grains weight. Late sowing and non-application of fungicide increased disease severity; there was reduced yield, grain quality, and N use efficiency. It is concluded that the use of N levels greater than 60 kg ha −1 in rice blast-susceptible cultivars in southern Brazil increases disease severity with lower N use, reduces grain yield and grain quality.

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Section: Discussionmentioning

confidence: 99%

Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil

Ogoshi

Carlos

Waldow

et al. 2020

J Soil Sci Plant Nutr

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“…Because of its self-incompatibility, the fungus reproduces sexually only when there is crossing between two sexually compatible and fertile individuals (Maciel et al, 2014;Maciel, 2019). This happens once the female receptive structure termed ascogonium is able to accept the compatible nucleus or nuclei of the male benefactor via conidia or receptor hyphae (Kang et al, 1994;Moreira et al, 2015). The fungus is very much host-specific and cannot infect incompatible hosts.…”

Section: Pathogen Biologymentioning

confidence: 99%

Wheat Blast: A Disease Spreading by Intercontinental Jumps and Its Management Strategies

et al. 2021

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Wheat blast (WB) caused by Magnaporthe oryzae pathotype Triticum (MoT) is an important fungal disease in tropical and subtropical wheat production regions. The disease was initially identified in Brazil in 1985, and it subsequently spread to some major wheat-producing areas of the country as well as several South American countries such as Bolivia, Paraguay, and Argentina. In recent years, WB has been introduced to Bangladesh and Zambia via international wheat trade, threatening wheat production in South Asia and Southern Africa with the possible further spreading in these two continents. Resistance source is mostly limited to 2NS carriers, which are being eroded by newly emerged MoT isolates, demonstrating an urgent need for identification and utilization of non-2NS resistance sources. Fungicides are also being heavily relied on to manage WB that resulted in increasing fungal resistance, which should be addressed by utilization of new fungicides or rotating different fungicides. Additionally, quarantine measures, cultural practices, non-fungicidal chemical treatment, disease forecasting, biocontrol etc., are also effective components of integrated WB management, which could be used in combination with varietal resistance and fungicides to obtain reasonable management of this disease.

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“…Especies del género Fusarium causan pudrición negra de los nudos, marchitez de la panícula (Figura 4) y elevan el número de panículas vacías (da Silva-Lobo et al, 2011), los granos infestados presentan abundante esporulación (micelio algodonoso de color blanco, rosa o gris), decoloración parcial o total (Rivero et al, 2012), lo que afecta negativamente el rendimiento, estudios reportan que la incidencia de plantas infectadas se debe a las sobre fertilización nitrogenada (Arata et al, 2022), al evaluar dosis de fertilización de 160 kg N ha -1 a 240 kg N ha -1 , se encontró mayor incidencia a altas dosis (Limón et al, 2016). Patógeno Pyricularia en Oryza sativa La especie Pyricularia oryzae es el patógeno más devastador en el cultivo de arroz (Scheuermann y Nesi, 2020;Moreira et al, 2015;Agbowuro et al, 2020). Los síntomas inician con puntos cafés en hojas y panículas (Figura 5).…”

Section: Daños Ocasionados Por Fusarium En Plantas De Arrozunclassified

Incremento de la patogenicidad de hongos en arroz bajo condiciones de desbalance nutricional

2022

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El presente artículo discute los hongos fitopatógenos potenciales que afectan al cultivo de arroz en condiciones de desbalance nutricional. A nivel mundial el arroz es considerado como el tercer cultivo alimentario de mayor importancia. Sin embargo, es afectado por diversos hongos fitopatógenos que ocasionan daños en hojas, tallos, panículas y granos del cultivo. La incidencia de estos hongos se debe a factores como la temperatura (25-37 ºC), humedad relativa (70-76%), humedad en el suelo, el viento y desbalance nutricional. El género Rhizoctonia causa manchas con forma elíptica de coloración marrón, pudrición de tallos y panículas, lo que reduce el 19% del rendimiento. Por otra parte, los hongos que se encuentran dentro de los géneros Alternaria, Fusarium, Curvularia y Pyricularia provocan manchas de color café y disminuyen la germinación, rendimiento, peso específico del grano (g L-1). Aunque existen investigaciones acerca de los hongos que afectan al cultivo del arroz, la asociación entre el desbalance nutricional y la incidencia de patógenos aún está por evaluarse en germoplasmas superiores a 100 variedades de arroz en condiciones óptimas y de desbalance nutricional.

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Reprodução Sexuada em Pyricularia oryzae

Cited by 9 publications

References 57 publications

Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil

Influence of Blast on the Nutrition and Yield of Irrigated Rice in Southern Brazil

Wheat Blast: A Disease Spreading by Intercontinental Jumps and Its Management Strategies

Incremento de la patogenicidad de hongos en arroz bajo condiciones de desbalance nutricional

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