Epidemiological analysis of clones and cultivars of potato in soil naturally infested with Ralstonia solanacearum biovar 2

Silveira, José Ricardo Pfeifer; Duarte, Valmir; Moraes, Marcelo Gravina de; Lopes, C. A.; Fernandes, J. M. C.; Barni, Valmor; Maciel, João Leodato Nunes

doi:10.1590/s0100-41582007000300001

Cited by 6 publications

(1 citation statement)

References 12 publications

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“…The microbial population represents 70% of the living biomass of the soil and is composed of invertebrate organisms. The main function sought with the incorporation of organic material is the suppression of soil-borne pathogens, through the increase of the population of beneficial bacteria and fungi that inhibit the action of the pathogenic organisms even in the presence of the susceptible host [25,26].…”

Section: Introductionmentioning

confidence: 99%

Influence of the Potato Production System in the Soil Suppressiveness to Bacterial Wilt

Zucolotto¹,

Ragassi

Lopes

et al. 2019

AJSSPN

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The potato crop is highly affected by soil-borne diseases motivating its continuous migration to non-cultivated areas. Bacterial wilt caused by Ralstonia spp. is one of the main diseases affecting the potato crop in Brazil, since the conventional production system, used throughout the country, promotes an ideal environment for proliferation of members of this pathogen complex. Studying alternative potato production systems aiming to improve the soil biological properties is necessary in order to avoid the continuous migration of the potato crop to new areas. The objective of this work was to evaluate different potato production systems, namely, the Paces an alternative potato production system and the organic potato production systems in contrast to the conventional production system, a soil from the Paces system sterilized through autoclaving and an undisturbed Atlantic rainforest soil regarding the soil suppressiveness to bacterial wilt caused by R. solanacearum. The experimental design was randomized blocks with three replications, arranged in a 4 x 4 + 1 factorial scheme, the main factor being the production system and the secondary factor corresponding to the doses of soil contaminated with R. solanacearum added to each treatment (0, 25, 50 and 75%). The additional treatment corresponded to the soil of the conventional system with high incidence of R. solanacearum. The soil suppressiveness to bacterial wilt is a biological process inhibited by autoclaving. The Paces and the organic potato production systems have a significant potential to suppress R. solanacearum in infested soil.

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Section: Introductionmentioning

confidence: 99%

Influence of the Potato Production System in the Soil Suppressiveness to Bacterial Wilt

Zucolotto¹,

Ragassi

Lopes

et al. 2019

AJSSPN

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Performance of Solanum phureja-derived bacterial-wilt resistant potato clones in a field naturally infested with Ralstonia solanacearum in Central Brazil

et al. 2021

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Bacterial wilt (BW), or brown rot, caused by the soil and seed borne bacterium Ralstonia solanacearum, is one of the most devastating diseases of potatoes cultivated in warmer regions of the world. There are no potato cultivars with a desirable level of BW resistance, although it has been recognized that resistance can be an outstanding component for disease management. However, the sources of resistance available lack agronomic traits required by potato growers, therefore being of little interest to breeders. The objective of this work was to evaluate the performance of 11 clones selected for BW resistance and improved for tuber traits upon selection in the last two decades. The clones under test were compared with susceptible and resistant clones and cultivars, in a completely randomized blocks design with three replications of single lines of 10 plants, in a field naturally infested with race 1, biovar 1, phylotype II of R. solanacearum. BW incidence was assessed 60-70 days after planting and total tuber yield in each plot was recorded 110 days after planting. All the evaluated clones presented higher levels of resistance to BW compared with the commercial varieties, not differing from the resistant, not commercial, controls. In a next step, these clones will be characterized for other desirable traits and those which combine high level of resistance and commercial characteristics will be recommended for breeders for enriching the genotypic background in the search for commercial varieties. We also confirmed that the cultivar BRSIPR Bel displays an intermediate level of resistance, what makes it an interesting genitor for its good agronomic characteristics. The findings of this work demonstrate that the improved potato clones selected under tropical conditions in the Embrapa’s pre-breeding project possess high and stable levels of resistance to bacterial wilt, being a valuable resource for breeders.

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Desempenho de cultivares de batata sob diferentes espaçamentos em solo naturalmente infestado com Ralstonia solanacearum

2017

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RESUMO Nos últimos anos, diversas cultivares nacionais de batata foram lançadas, tais como BRSIPR Bel e BRS Camila, como alternativas às cultivares importadas tradicionalmente cultivadas no Brasil. Avaliou-se o comportamento das cultivares BRSIPR Bel, BRS Camila e Agata quando plantadas em quatro espaçamentos entre batatas-semente na linha (15, 20, 25 e 30 cm) em um campo naturalmente infestado com Ralstonia solanacearum em Brasília-DF. O delineamento experimental foi de parcelas subdivididas com quatro repetições, sendo a parcela composta pelos diferentes espaçamentos e a subparcela pelas cultivares. Aos 59 dias após o plantio (DAP), a incidência de plantas com sintomas de murcha bacteriana foi avaliada e, na colheita, (116 DAP), foram avaliados: massa total de tubérculos, massa de tubérculos comerciais, número total de tubérculos e número de tubérculos comerciais. ‘BRSIPR Bel’, ‘Agata’ e ‘BRS Camila’ apresentaram diferentes níveis de suscetibilidade à murcha bacteriana, de 20, 30 e 80% de plantas sintomáticas aos 59 DAP, respectivamente. ‘BRS Camila’ apresentou produtividade inferior à ‘BRSIPR Bel’ e ‘Agata’. Não houve efeito significativo do espaçamento de plantio sobre as variáveis mensuradas, mas ‘BRSIPR Bel’ e ‘Agata’ demonstraram um maior nível de resistência que ‘BRS Camila’, que se traduziu em maior produtividade nas condições avaliadas.

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Epidemiological analysis of clones and cultivars of potato in soil naturally infested with Ralstonia solanacearum biovar 2

Cited by 6 publications

References 12 publications

Influence of the Potato Production System in the Soil Suppressiveness to Bacterial Wilt

Influence of the Potato Production System in the Soil Suppressiveness to Bacterial Wilt

Performance of Solanum phureja-derived bacterial-wilt resistant potato clones in a field naturally infested with Ralstonia solanacearum in Central Brazil

Desempenho de cultivares de batata sob diferentes espaçamentos em solo naturalmente infestado com Ralstonia solanacearum

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