Partial resistance to neck blast influenced by stage of panicle development and rice genotype

Roumen, E.

doi:10.1007/bf00046046

Cited by 28 publications

(11 citation statements)

References 5 publications

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“…This range was lower than values found earlier [10], but which corresponded to lesion size at 9 DAI. Incubation periods for neck blast were estimated to 9–10 days [16], and 7–9 days [17], which are close to the results obtained in this study. Lesion lengths on necks ranged between 20 and 30 mm, which are close to the values obtained earlier [17].…”

Section: Discussionsupporting

confidence: 86%

“…Incubation periods for neck blast were estimated to 9–10 days [16], and 7–9 days [17], which are close to the results obtained in this study. Lesion lengths on necks ranged between 20 and 30 mm, which are close to the values obtained earlier [17]. Sporulation intensity on necks ranged between 25,000 and 40,000 spores per lesion in our study, which corresponds to ranges found at 15 DAI [18] (20,000–80,000 spores per lesion).…”

Section: Discussionsupporting

confidence: 86%

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Variability in Aggressiveness of Rice Blast (Magnaporthe oryzae) Isolates Originating from Rice Leaves and Necks: A Case of Pathogen Specialization?

et al. 2013

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Rice blast, caused by Magnaporthe oryzae, causes yield losses associated with injuries on leaves and necks, the latter being in general far more important than the former. Many questions remain on the relationships between leaf and neck blast, including questions related to the population biology of the pathogen. Our objective was to test the hypothesis of adaptation of M. oryzae isolates to the type of organ they infect. To that aim, the components of aggressiveness of isolates originating from leaves and necks were measured. Infection efficiency, latent period, sporulation intensity, and lesion size were measured on both leaves and necks. Univariate and multivariate analyses indicated that isolates originating from leaves were less aggressive than isolates originating from necks, when aggressiveness components were measured on leaves as well as on necks, indicating that there is no specialization within the pathogen population with respect to the type of organ infected. This result suggests that the more aggressive isolates involved in epidemics on leaves during the vegetative stage of the crop cycle have a higher probability to infect necks, and that a population shift may occur during disease transmission from leaves to necks. Implications for disease management are discussed.

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Section: Discussionsupporting

confidence: 86%

Section: Discussionsupporting

confidence: 86%

Variability in Aggressiveness of Rice Blast (Magnaporthe oryzae) Isolates Originating from Rice Leaves and Necks: A Case of Pathogen Specialization?

et al. 2013

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“…Leaf infection reduces the photosynthetic area of the plant, which can lead to its death. Panicle infection is that which causes the most important economic losses via yield reduction (Roumen, 1992).…”

Section: Resumen Evaluación De La Resistencia De Cultivares De Arroz mentioning

confidence: 99%

Resistance of rice cultivars to Pyricularia oryzae in Southern Spain

Castejón‐Muñoz

Lara-Álvarez

Aguilar

2007

Span. j. agric. res.

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The susceptibility of 14 commercial rice cultivars to Pyricularia oryzae was tested under field conditions agronomically appropriate for natural infection to occur. The first symptoms of infection were detected on the leafs when the crops were at the medium tillering stage. Generally speaking, the incidence of infection for each particular cultivar was similar in the 2002 and 2003 seasons and at the two trial locations (the Sartenejales and Casudis estates in the Province of Seville). The pathogen infected 80-100% of "Maratelli", "Baixet", "Thainato" and "Galatxo" plants. Differences were seen among the cultivars with respect to the parts of the plant affected. "Baixet" and "Maratelli" were the most susceptible cultivars, followed by "Thainato". "Ullal" was the most tolerant, followed by "Marisma", "Puebla", "Maso", "L-202", "Susan", "Doongara", "Fonsa" and "Jacinto"; these last six cultivars showed medium disease severity according to the scale used in this work. Further studies on the interactions between different strains of P. oryzae and rice cultivars are underway.

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“…Leaf infection reduces photosynthetic area and may eventually result in plant death. Panicle infection reduces yield and therefore this involves important economic losses (Roumen, 1992).…”

Section: Introductionmentioning

confidence: 99%

Review of the Rice Blast Diseases (Pyricularia Oryzae) Response to Nitrogen and Silicon Fertilizers

Fetene¹

2019

International Journal of Research Studies in Agricultural Scien

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The rice blast disease, caused by a fungus Pyricularia oryzae (Cavara), is a worldwide problem in rice and is dangerous because of its yield loss potential ranging up to 100% under favourable conditions. Blast development is favoured by thick stands and high nitrogen rates which increase canopy thickness. With this in mind it indicated that some fertilizer application may have a negative or positive response of plants toward the disease. High rate of nitrogen fertilization has been found to increase the severity of the rice blast disease to a great extent as compared to the low nitrogen rate. In contrast, high rate of silicon fertilization reduces the severity of the disease and vice versa. Therefore, nutrition management is one of the most important practices for high production system that may affect response of rice to blast disease.

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Partial resistance to neck blast influenced by stage of panicle development and rice genotype

Cited by 28 publications

References 5 publications

Variability in Aggressiveness of Rice Blast (Magnaporthe oryzae) Isolates Originating from Rice Leaves and Necks: A Case of Pathogen Specialization?

Variability in Aggressiveness of Rice Blast (Magnaporthe oryzae) Isolates Originating from Rice Leaves and Necks: A Case of Pathogen Specialization?

Resistance of rice cultivars to Pyricularia oryzae in Southern Spain

Review of the Rice Blast Diseases (Pyricularia Oryzae) Response to Nitrogen and Silicon Fertilizers

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