Influência da microbiolização de sementes de feijão sobre a transmissão de Colletrichum Lindemuthianum (Saac e Magn)

Corrêa, Bianca Obes; Moura, Andrea Bittencourt; Denardin, N. D.; Soares, Vanessa Nogueira; Schafer, Jaqueline Tavares; Ludwig, Juliane

doi:10.1590/s0101-31222008000200019

Cited by 13 publications

(9 citation statements)

References 8 publications

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“…phaseoli (Zanatta et al, 2007;Sallan, 2011), Pseudomonas savastanoi pv. phaseolicola (Garret and Schwartz, 1998), Colletotrichum lindemuthianum (Corrêa et al, 2008;Bardas et al, 2009) and Pseudocercospora griseola (Corrêa et al, 2014). However, the studies that evaluate the efficacy of BCA in controlling the diseases caused by different strains of the same pathogen are rare.…”

Section: Introductionmentioning

confidence: 99%

Interaction between bacterial biocontrol-agents and strains of Xanthomonas axonopodis pv. phaseoli effects on biocontrol efficacy of common blight in beans

CorrÃaa¹,

Soares²,

Sangiogo³

et al. 2017

Afr. J. Microbiol. Res.

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The bacterial biocontrol agents (BCAs) treatments were used for seed microbiolization; the bacterial biocontrol agents (BCAs) used selected from previous study on the control of Xanthomonasaxonopodis pv. phaseoli Xap) includes: Bacillus (DFs093, DFs348 and DFs769), Pseudomonas (DFs513, DFs831 and DFs842), Rhodococcus (DFs843 and DFs912), and the combinations C01 (DFs093+DFs769+DFs831), C02 (DFs093+DFs769+DFs842) and C03 (DFs093+DFs769+DFs348). Sixteen (16) Xap strains were collected from several Brazilian regions, and were inoculated in cotyledonary leaves. The symptom development was followed for 10 days. The treatments were compared by the area under the disease progress curve for disease incidence, severity, and index. In general, majority of the BCAs reduced, to some degree, the disease caused by different Xap strains. The combination C01, and the isolate DFs831 resulted in highest mean disease control. The data from this study suggest a relationship between the region of origin of Xap strain and the efficacy of BCA to control the disease caused by it. The use of combinations of these organisms increased the efficacy of the biocontrol of several strains of the same pathogen. A strain-BCA interaction was shown by data collected from this study, which evidence the importance of selecting a BCA or a combination of BCAs with a wider spectrum of action.

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Section: Introductionmentioning

confidence: 99%

Interaction between bacterial biocontrol-agents and strains of Xanthomonas axonopodis pv. phaseoli effects on biocontrol efficacy of common blight in beans

CorrÃaa¹,

Soares²,

Sangiogo³

et al. 2017

Afr. J. Microbiol. Res.

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“…O uso de sementes tratadas com agentes de biocontrole é uma das recomendações para conter a transmissão de doenças via sementes, além de contribuir para uma maior densidade de plantas na lavoura (Corrêa et al, 2008). Por outro lado, o tratamento de sementes com fungicidas sintéticos tem sido questionado devido ao uso abusivo desses produtos na agricultura, por onerar os custos de produção e, principalmente, por contaminar o meio ambiente (Vinale et al, 2008).…”

Section: Introductionunclassified

Controle de Fusarium oxysporum f.sp. phaseoli in vitro e em sementes, e promoção do crescimento inicial do feijoeiro comum por Trichoderma harzianum

Carvalho¹,

Mello²,

Júnior³

et al. 2011

Trop. plant pathol.

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RESUMOEste trabalho objetivou avaliar seis isolados de Trichoderma harzianum no controle de Fusarium oxysporum f.sp. phaseoli em sementes, e seu efeito no crescimento inicial do feijoeiro comum. Os isolados foram inicialmente confrontados in vitro com o patógeno em testes de cultura pareada e antibiose a 25ºC. Sementes sadias e artificialmente infectadas pelo patógeno foram microbiolizadas com 2 mL de suspensões dos antagonistas (2,5 x 10 8 conídios mL -1 ) para cada 100 g de sementes, em rolo de papel germtest a 20 e 25°C. Os percentuais de incidência do patógeno e de plântulas normais foram avaliados aos sete e nove dias, respectivamente. Em casa de vegetação, os isolados foram aplicados a 5 x 10 9 conídios 500 g -1 de substrato autoclavado, com avaliação do comprimento das raízes e parte aérea das plantas 11 dias após o semeio (12 plantas tratamento -1 ). Todos os isolados apresentaram antagonismo in vitro contra o patógeno. Os isolados CEN202, CEN234, CEN238, CEN240 foram superiores à testemunha no controle de F. oxysporum em sementes, reduzindo entre 35 e 51% da incidência do patógeno e proporcionando entre 73 e 81% de plântulas normais. O comprimento total das plantas com tratamento CEN239 (37,43 cm) foi superior aos demais, cujo comprimento variou entre 27,84 e 33,95 cm. Palavras-chave: Phaseolus vulgaris, controle biológico, patologia de sementes, supressão de crescimento. ABSTRACT Control of Fusarium oxysporum f.sp phaseoli in vitro and on seeds and growth promotion of common bean in early stages by Trichoderma harzianumThe objective of this study was to evaluate the antagonistic capacity of six isolates of Trichoderma harzianum against Fusarium oxysporum f.sp. phaseoli on infected seeds and its effect on the early stages of growth in bean plants. The isolates were also evaluated in dual culture assays and under in vitro antibiosis at 25ºC. Healthy and infected seeds were treated with 2 mL 100 g -1 seeds of the antagonist suspensions (2.5 x 10 8 conidia mL -1 ) for healthy evaluation using blotter method at 20 and 25°C. The percentages of pathogen incidence and normal seedlings were evaluated at seven and nine days, respectively. The isolates were applied at 5 x 10 9 conidia 500 g -1 of sterilized substrate in greenhouse. After 11 days, roots and shoots of the bean plants were measured (12 plants treatment -1 ). Every isolate of T. harzianum presented in vitro antagonism against the pathogen. The strains CEN202, CEN234, CEN238 and CEN240 offered better control of F. oxysporum on seeds than the positive check, causing a reduction between 35 and 51% in pathogen incidence and 73-81% of normal seedling emergence. The total length of the plants treated with CEN239 (37.43 cm) was longer than the other treatments, with length varying between 27.84 and 33.95 cm.

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“…It is not unusual to observe variable behavior between different samples of seeds treated with microorganisms that promote plant growth and/or biocontrol. Corrêa et al (2008) assessed the growth-promoting capacity of some rhizobacteria and noted that some treatments allowed an increase in the germination percentage of bean seeds, although more intense effects have been observed for ESI, especially in sample B. Nevertheless, the assessments of root dry weight and leaf dry weight had higher results in sample A for plants measured both individually and together.…”

Section: Resultsmentioning

confidence: 99%

Physiological performance of rice seeds treated with thiamethoxam or rhizobacteria under different temperatures

et al. 2014

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-This study aimed to evaluate, at 15, 20 and 25 ºC, the physiological potential and enzyme activity of seedlings from six samples of rice seeds stored for one year and treated with growth-promoting rhizobacteria (Pseudomonas synxantha) and the bioactivator thiametoxam. The following were evaluated: seed germination, first germination count, root protrusion speed index, emergence percentage and emergence speed index, shoot and root length and enzyme activity (esterases, α-amylase and peroxidases) at 15, 20 and 25 ºC. In these conditions, thiametoxam and the rhizobacteria P. synxantha (DFs 185) improved the physiological performance of rice seeds with physiological qualities at low temperatures (20 and 15 ºC) and did not change the expression of the esterase and peroxidase isoenzymes. The rhizobacteria P. synxantha (DFs 185) increased the expression of the enzyme α-amylase at low temperatures.

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Influência da microbiolização de sementes de feijão sobre a transmissão de Colletrichum Lindemuthianum (Saac e Magn)

Cited by 13 publications

References 8 publications

Interaction between bacterial biocontrol-agents and strains of Xanthomonas axonopodis pv. phaseoli effects on biocontrol efficacy of common blight in beans

Interaction between bacterial biocontrol-agents and strains of Xanthomonas axonopodis pv. phaseoli effects on biocontrol efficacy of common blight in beans

Controle de Fusarium oxysporum f.sp. phaseoli in vitro e em sementes, e promoção do crescimento inicial do feijoeiro comum por Trichoderma harzianum

Physiological performance of rice seeds treated with thiamethoxam or rhizobacteria under different temperatures

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