An Unprecedented Outbreak of Rice Blast on a Newly Released Cultivar BRS Colosso in Brazil

Prabhu, A. S.; Filippi, Marta Cristina Corsi de; Silva, Gisele Barata da; Lobo, Valácia L S; Morais, O. P. de

doi:10.1007/978-1-4020-9500-9_26

Cited by 42 publications

(37 citation statements)

References 13 publications

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“…Aimoré is an upland rice cultivar from Brazil that is very rustic and has a short cycle. Despite the vast potential that these cultivars exhibited (Table 2), BRS Liderança was suspended even before seed marketing, and BRS Colosso was dropped soon after the first year of commercial growing because the GY was rigorously affected due to the breakdown of the rice panicle blast resistance (Magnaporthe oryzae) such that previously tolerant elite-lines became highly susceptible (Prabhu et al 2009). BRS Pepita is a current cultivar in Embrapa's portfolio, which simultaneously presented an excellent GY (24th ranking for G i ) and superiority in adaptability and stability compared to other current cultivars, including BRS Monarca, BRS Bonança and BRS Sertaneja.…”

Section: Resultsmentioning

confidence: 98%

Upland rice breeding in Brazil: a simultaneous genotypic evaluation of stability, adaptability and grain yield

et al. 2013

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The relative performance of one genotype is not identical in different environments due to genotype-environment interaction (G9E). Thus, for a breeding program to successfully develop cultivars, it is fundamental that candidate elite-lines are tested in several target environments and that the data are analysed for yield, adaptability and stability. The objective of this work was to study the G9E for upland rice using a mixed model and, using the harmonic mean of relative performance of genotypic values (HMRPGV) method, to analyse cultivars and elite-lines over time to identify those that aggregate high grain yield (GY) with high genotypic adaptability and stability. A large dataset of ''value for cultivation and use trials'' collected by the Brazilian Agricultural Research Corporation (Embrapa) and collaborators from 1984 to 2010, involving seven states that represent upland rice crops in the Midwest, North and Northeast regions of Brazil, was used. The effect of location was shown to be more important than the effect of year for promoting crossover interaction. The CNA 8555 had the best GY associated with adaptability and stability, presenting a superiority of 13.28 % above the general mean of all elite-lines. Using already-released cultivars and potential elite-lines, the generalised linear regression analysis revealed significant progress of the stability and adaptability associated with GY over time. The HMRPGV method was shown to be an important tool and allowed identification of three elite-lines in the Embrapa pipeline (AB 062008, AB 062041 and AB 062037), each with high stability, adaptability and yield potential to be released commercially.Keywords Oryza sativa Á HMRPGV Á BLUP Á REML Á G9E Á Genetic progress Abbreviations BLUPBest linear unbiased predictor REML Restricted maximum likelihood GY Grain yield VCU Value for cultivation and use G9EGenotype-environment interaction G9LGenotype-location interaction G9YGenotype-year interaction G9L9YGenotype-location-year interaction HMRPGV Harmonic mean of relative performance of genotypic values

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Section: Resultsmentioning

confidence: 98%

Upland rice breeding in Brazil: a simultaneous genotypic evaluation of stability, adaptability and grain yield

et al. 2013

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“…This cereal is very important because more than half of the world population depends on rice as a staple food (FAO, 2011). Rice blast [Magnaporthe oryzae B. Couch, anamorph Pyricularia oryzae Cavara] is reported in all rice growing regions in the world and grain yield losses due to this disease may reach up to 100% (Prabhu et al, 2009;Fisher et al, 2012). Under tropical climatic conditions, combined with pathogen biology and limited durability of cultivar resistance, growers resort to intensive application of agricultural chemicals which result in environmental damage such as soil and water contamination, destruction of non-target microorganisms, human health hazards, selection of new pathotypes, besides increased production costs (Ramos, 2009).…”

Section: Introductionmentioning

confidence: 99%

Increased enzymatic activity in rice leaf blast suppression by crude extract of Epicoccum sp

Sena¹,

Chaibub²,

Cortes³

et al. 2013

Trop. plant pathol.

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Epicoccum sp. showed in vitro antagonism to the rice pathogens Magnaporthe oryzae, Rhizoctonia solani, Sarocladium oryzae, Monographella albescens and Cochliobolus miyabeanus in dual culture. The colony growth of the rice blast fungus, M. oryzae, was reduced by 42.50%. The lethal doses (LD 50 ) determined based on probit-log dosage response curves at 3 and 6 hours after germination were 393.0 and 326.6 ppm, respectively. The crude extract (600 ppm) reduced appressorial formation by 95.68%. A greenhouse experiment comparing the relative efficiency of conidial suspension and crude extract of Epicoccum sp. in the suppression of leaf blast showed no statistical difference between both application methods. However, the crude extract of Epicoccum sp. (4000 ppm) 48 hours before the application of M. oryzae induced resistance and suppressed leaf blast by 97.6%. Scanning electron microscopy of rice leaves inoculated with crude extract of Epicoccum sp. and challenged with M. oryzae showed appressorial deformation on penetration phase. Peroxidase and β-1,3-glucanase activities increased in plants sprayed with crude extract of Epicoccum sp., 24 hours after the application of the challenger. PAL as well as chitinase activities increased 72 hours after challenge inoculation. Epicoccum sp. was shown to be a potential antagonist and inducer of resistance against M. oryzae.

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“…Rice blast, caused by Pyricularia oryzae (teleomorph = Magnaporthe oryzae) is one of the most important diseases, due to its worldwide distribution, destructiveness and high degree of pathogenicity (Thuan et al, 2006;Rodríguez et al, 2007). Rice blast can cause up to 100% in yield reduction, depending on the cultivar susceptibility, cropping technology and climatic conditions (Prabhu et al, 2009, Magar et al, 2015. Although infections are mostly reported to occur in leaves and stems, seeds and roots may also be infected by P. oryzae, using the typical developmental processes of root-infecting fungi (Sesma and Osbourn, 2004).…”

Section: Author(s) Agree That This Article Remain Permanently Open Acmentioning

confidence: 99%

Characterization of fluorescent Pseudomonas from Oryza sativa L. rhizosphere with antagonistic activity against Pyricularia oryzae (SACC.)

Hernández-Rodríguez¹,

Acebo-Guerrero²,

FernÃ¡ndez³

et al. 2018

Afr. J. Biotechnol.

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The aim of this work was to select and characterize native Cuban fluorescent Pseudomonas from the rhizosphere of Oryza sativa with in vitro and in vivo antagonistic activity against Pyricularia oryzae. A total of 200 isolates were recovered with the typical growth and cultural characteristics of fluorescent Pseudomonas. The results showed that 12.5% of total isolates were capable of inhibiting mycelial growth, with different levels of inhibition between strains. Six of them (AI03, AI05, AI08, AJ01, AJ13 and AJ29) were able to reduce disease severity and incidence in vivo whereas only four (AI05, AJ13, AJ01 and AI08) showed efficient control of P. oryzae in greenhouse conditions. Pseudomonas fluorescens AI05 and Pseudomonas putida AJ13 were able to inhibit in vitro the mycelial growth of P. oryzae and to reduce symptom severity of Pyricularia infection. The production of lytic enzymes, siderophores, hydrogen cyanide (HCN), as well as the detection of genes encoding antibiotics and bacterial motility were also assessed for both strains. They were able to fix nitrogen, produce indolic compounds and to solubilize Pi. These results demonstrate the potential use of P. fluorescens AI05 and P. putida AJ13 as a biocontrol agent for the protection of rice plants from P. oryzae infection.

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An Unprecedented Outbreak of Rice Blast on a Newly Released Cultivar BRS Colosso in Brazil

Cited by 42 publications

References 13 publications

Upland rice breeding in Brazil: a simultaneous genotypic evaluation of stability, adaptability and grain yield

Upland rice breeding in Brazil: a simultaneous genotypic evaluation of stability, adaptability and grain yield

Increased enzymatic activity in rice leaf blast suppression by crude extract of Epicoccum sp

Characterization of fluorescent Pseudomonas from Oryza sativa L. rhizosphere with antagonistic activity against Pyricularia oryzae (SACC.)

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