Doenças da mandioquinha-salsa e sua situação atual no Brasil

Henz, Gilmar Paulo

doi:10.1590/s0102-05362002000200004

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…The five strains of pathovar arracaciae isolated in Brazil over a 30-year span clustered in a tight clonal complex clearly separated from other strains. The pathovar is the causal agent of leaf spot of arracacha (Arracacia xanthorrhiza), a common disease in Brazil (103). The two strains of pathovar guizotiae were isolated in Ethiopia, where the bacterial leaf spot of niger (Guizotia abyssinica) was first described (23).…”

Section: Discussionmentioning

confidence: 99%

Aggressive Emerging Pathovars of Xanthomonas arboricola Represent Widespread Epidemic Clones Distinct from Poorly Pathogenic Strains, as Revealed by Multilocus Sequence Typing

Saux

Bonneau

Essakhi

et al. 2015

Appl Environ Microbiol

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cDeep and comprehensive knowledge of the genetic structure of pathogenic species is the cornerstone on which the design of precise molecular diagnostic tools is built. Xanthomonas arboricola is divided into pathovars, some of which are classified as quarantine organisms in many countries and are responsible for diseases on nut and stone fruit trees that have emerged worldwide. Recent taxonomic studies of the genus Xanthomonas showed that strains isolated from other hosts should be classified in X. arboricola, extending the host range of the species. To investigate the genetic structure of X. arboricola and the genetic relationships between highly pathogenic strains and strains apparently not relevant to plant health, we conducted multilocus sequence analyses on a collection of strains representative of the known diversity of the species. Most of the pathovars were clustered in separate monophyletic groups. The pathovars pruni, corylina, and juglandis, responsible for pandemics in specific hosts, were highly phylogenetically related and clustered in three distinct clonal complexes. In contrast, strains with no or uncertain pathogenicity were represented by numerous unrelated singletons scattered in the phylogenic tree. Depending on the pathovar, intraand interspecies recombination played contrasting roles in generating nucleotide polymorphism. This work provides a population genetics framework for molecular epidemiological surveys of emerging plant pathogens within X. arboricola. Based on our results, we propose to reclassify three former pathovars of Xanthomonas campestris as X. arboricola pv. arracaciae comb. nov., X. arboricola pv. guizotiae comb. nov., and X. arboricola pv. zantedeschiae comb. nov. An emended description of X. arboricola Vauterin et al. 1995 is provided.A s international trade and travel increase, emerging infectious diseases regularly threaten human health, as well as agricultural production (livestock and crops), and may be responsible for huge social, economic, and environmental damages. Our capability to quickly detect and identify the microorganisms responsible for these emerging diseases is critical to implement effective crop protection, sanitary measures, and regulations. The development of efficient and precise diagnostic tools relies on a stable and comprehensive classification. Providing a classification frame with names predictive of ecological, phenotypic, genotypic, and phylogenetic properties is the primary aim of taxonomic studies.Sequencing of sets of housekeeping genes (multilocus sequence analysis [MLSA]) has become the standard today for phylogenetic analyses of bacterial species and was proposed as an alternative to DNA-DNA hybridizations for species delineation (1, 2). MLSA allows strain assignment at the species level (3-5) and gives rise to specialized databases (5-7). MLSA treats sequences at the nucleotide level for phylogenetic analysis, but the recorded data can also be converted into alleles, an approach known as multilocus sequence typing (MLST). MLST was introdu...

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Section: Discussionmentioning

confidence: 99%

Aggressive Emerging Pathovars of Xanthomonas arboricola Represent Widespread Epidemic Clones Distinct from Poorly Pathogenic Strains, as Revealed by Multilocus Sequence Typing

Saux

Bonneau

Essakhi

et al. 2015

Appl Environ Microbiol

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“…De acordo com estimativas, em 2000, a área cultivada com mandioquinha-salsa no Brasil foi de 13.000 ha e a produtividade média de 9,2 t ha -1 . O Paraná é o maior produtor brasileiro, seguido por Minas Gerais e Espírito Santo (HENZ, 2002).…”

Section: Introdução Introdução Introdução Introduçãounclassified

Agrosilício na produção de clones de mandioquinha-salsa

Sediyama

Santos

Albanez³

et al. 2009

Acta Sci. Agron.

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“…O Brasil é o maior produtor de mandioquinhasalsa, com área cultivada em torno de 13.000 ha, em 2000 (HENZ, 2002). Os Estados do Paraná e de Minas Gerais são os principais produtores, cuja produtividade média é de 8,8 t.ha -1 (SANTOS, 1997).…”

Section: Introductionunclassified

Avaliação de herbicidas no controle de plantas daninhas em mandioquinha-salsa

Sediyama

Freitas²,

Pereira³

et al. 2008

Bragantia

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Avaliou-se a eficiência de herbicidas aplicados em pré e pós-emergência no controle de plantas daninhas e na produção de mandioquinha-salsa na Fazenda Experimental da EPAMIG, em Oratórios (MG), de maio a dezembro de 2002. Utilizou-se o delineamento de blocos casualizados com quatro repetições e 15 tratamentos incluindo duas testemunhas, com e sem capina. Em cada tratamento, foi usado um herbicida em pré e outro em pós-emergência das plantas, aplicados aos três e aos 45 dias após o plantio (DAP) respectivamente. A eficiência de controle e a toxidez dos herbicidas foram avaliadas aos 60 DAP e a produção de matéria seca de plantas daninhas aos 60 e 130 DAP. Na colheita, avaliou-se produção de raízes, coroa e parte aérea. A emergência de plantas foi máxima aos 45 DAP e, posteriormente, houve redução no estande, quando se utilizaram os herbicidas atrazine + óleo mineral e oxadiazon, em pós-emergência. Esses herbicidas, apesar de eficientes no controle de plantas daninhas, causaram toxidez à cultura. Na produção de raízes, destacaram-se os tratamentos: atrazine +fluazifop-p-butil; diuron + fluazifop-p-butil; diuron + Oxadiazon; linuron + fluazifop-p-butil; metolachlor + metribuzin + linuron e oxadiazon + diuron, com bom controle de plantas daninhas e rendimentos de raízes comerciais semelhantes ao da testemunha mantida no limpo (8,62 t ha -1 ).Palavras-chave: Arracacia xanthorrhiza, controle químico, toxidez, seletividade. ABSTRACT HERBICIDE EFFICIENCY IN CONTROLLING WEEDS IN PERUVIAN CARROTThe efficiency of herbicides applied in pre-and post-emergence for weed control in Peruvian carrot production was evaluated at the EPAMIG Experimental Farm, Oratórios, Minas Gerais State, from May to December, 2002. The experiment was arranged in a randomized block design, with four replications and 15 treatments, including two controls (with and without weeding). Pre-and post-emergence herbicides were used in each treatment applied at 3 and 45 days after planting (DAP), respectively. Efficiency and toxicity were evaluated at 60 DAP and weed dry matter yield at 60 and 130 DAP. At the time of harvest, the yield of root, crown and aerial parts were evaluated. There were no differences among treatments for plant emergence. Plant emergence was highest at 45 DAP and later, followed by a decrease in the stand when atrazine + mineral oil and oxadiazon were used in pre-emergence. Despite being efficient, these herbicides caused toxicity to the crop. The following treatments stood out for root yield: atrazine + fluazifop-p-butil, diuron + fluazifop-p-butil, diuron + oxadiazon, linuron + fluazifop-p-butil, metolachlor + metribuzin + linuron e oxadiazon + diuron, giving good weed control and yield of commercial roots similar to the control kept with no weed (8.62 t ha -1 ).

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Doenças da mandioquinha-salsa e sua situação atual no Brasil

Cited by 15 publications

References 5 publications

Aggressive Emerging Pathovars of Xanthomonas arboricola Represent Widespread Epidemic Clones Distinct from Poorly Pathogenic Strains, as Revealed by Multilocus Sequence Typing

Aggressive Emerging Pathovars of Xanthomonas arboricola Represent Widespread Epidemic Clones Distinct from Poorly Pathogenic Strains, as Revealed by Multilocus Sequence Typing

Agrosilício na produção de clones de mandioquinha-salsa

Avaliação de herbicidas no controle de plantas daninhas em mandioquinha-salsa

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