Suscetibilidade de três espécies cítricas à Dothiorella gregaria Sacc. em função do estado nutricional

Moraes, Wilson da Silva; Castro, Hilário Antônio de; Lima, Juliana Domingues; Leite, Eloísa Aparecida das Graças; Souza, Maurício de

doi:10.1590/s0103-84782007000100002

Cited by 4 publications

(3 citation statements)

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“…Diferentes autores mencionam que o controle eficiente de doenças em plantas frutíferas, causadas por fungos Botryosphaeriaceae, é obtido somente por meio da adoção de estratégias de manejo integrado, o que envolve conhecimento da suscetibilidade da cultivar, das condições ambientais favoráveis ao patógeno, correto manejo da planta e manejo cultural e químico (BROWN-RYTLEWSKI;MCMANUS, 2000;BECKMAN et al, 2003;MORAES et al, 2007). Entretanto, apesar da importância das podridões em mangas causadas por F. aesculis e N. parvum, poucos têm sido os trabalhos relacionados aos dois patossistemas e nenhum foi publicado no Brasil objetivando encontrar fontes com resistência a esses patógenos em acessos da cultura presentes em Bancos Ativos de Germoplasma (BAG's).…”

Section: Introductionunclassified

Avaliação da resistência de 47 acessos de mangueira aos fungos Fusicoccum aesculis e Neofusicoccum parvum

Batista¹,

Neto²,

Barbosa³

et al. 2012

Rev. Bras. Frutic.

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RESUMO:A mangicultura praticada no Submédio do Vale do São Francisco é considerada um dos principais destaques no comércio externo do País. Dentre as diversas variedades cultivadas, a Tommy Atkins é a que representa a maior parte das exportações. Entretanto, a magnitude das perdas por podridões pós--colheita, causadas por fungos Botryosphaeriaceae, é sempre uma grande preocupação para exportadores e importadores da fruta. A busca por métodos de controle mais eficazes e limpos é uma tendência mundial. Nesse sentido, o objetivo deste trabalho foi avaliar a reação de frutos, de 47 acessos de mangueiras, quanto à resistência aos fungos Fusicoccum aesculis e Neofusicoccum parvum. As inoculações foram realizadas mediante deposição de disco do meio de cultura batata-dextrose-ágar (BDA), contendo estruturas do pató-geno sobre duas posições opostas na região equatorial da manga, mantido, posteriormente, por 24 horas em câmara úmida. Foram realizadas medições das lesões até o sétimo dia, com uma régua milimetrada. Com os registros dos crescimentos das lesões, foram calculadas as taxas diárias de crescimento da lesão (TDCL's) para cada acesso. As maiores TDCLs foram observadas nos acessos 'Roxa' e 'Lita', quando inoculados com F. aesculis, e nos acessos 'Roxa', 'Ruby', 'Papo de peru', 'CPAC 22/93', 'Pingo-de-ouro', 'Pêssego' e 'M13269', quando inoculados com N. parvum. Os acessos 'Nego-não-chupa', 'Manga-d'água', 'Juazeiro VI', 'Juazeiro VII' e 'Favo-de-mel' foram os que apresentaram, concomitantemente, as menores TDCLs para ambos os patógenos e diferenças significativas em relação aos demais acessos. Termos para indexação: Podridão peduncular, Botryosphaeriaceae, Mangifera indica. RESISTANCE AVALIATION OF 47 MANGO GERMPLASM TO THE FUNGIFusicoccum aesculis AND Neofusicoccum parvum ABSTRACT -The production of mango in the San Francisco Valley lower basin is considered one of the highlights in the export of the fruit by the country. Fruits of the cultivar Tommy Atkins are the most exported. However, the magnitude of losses due to post-harvest rots caused by fungi Botryosphaeriaceae is always a major concern for the exporter and importer of fruit. The search for control methods more effective and clean is a worldwide trend. The objective of this study was to evaluate the reaction of the fruits of 47 mango genotypes, for resistance to fungi Fusicoccum aesculis and Neofusicoccum parvum. The inoculations were performed by means of deposition culture medium discs potato-dextrose-agar (PDA) containing the pathogen structures on two positions perpendicular to the mango, and then maintained for 24 hours in a humid chamber.

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Section: Introductionunclassified

Avaliação da resistência de 47 acessos de mangueira aos fungos Fusicoccum aesculis e Neofusicoccum parvum

Batista¹,

Neto²,

Barbosa³

et al. 2012

Rev. Bras. Frutic.

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“…However, D. gregaria is the first report that can cause fruit rot in kiwifruit. It was previously reported as the causative agent of poplar canker [66,67], jujube fruit shrink disease [68,69], jujube fruit black rot disease [70], cedar dieback disease [71,72], citrus [73]. In previous studies, there are fewer control methods for this fungus: the combination of 20.67% Wanxing EC + 68.75% Yibao dispersible granules + 72% streptomycin soluble powder had a good control effect on the fungus, and the field control effect on jujube shrinkage fruit disease reached 86.9% [68].…”

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confidence: 99%

Identification of the Pathogens and Laboratory Bioactivity Determination of the Rot Disease of Kiwifruit (Actinidia spp.)

Ren¹,

Wang²,

Tang³

et al. 2022

Journal of Chemistry

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Kiwifruit is an important economic crop in the world today with a high nutritional value. It can cause huge damage by causing kiwifruit rot disease; however, at present, the control methods for this disease are limited. In this study, the rotten fruits of kiwifruit (Cultivar “Jinyan”) were collected from Pujiang city (Sichuan province), Xixia city, (Henan province), Zhouzhi (Shaanxi province), Meixian city (Shaanxi province), and Bijie (Guizhou province), China, and the pathogenic fungi were identified by isolation and purification, pathogenicity test, morphological characteristics, and analysis of ribosomal DNA internal transcribed spacer (rDNA-ITS) sequences. The results showed that the pathogenic fungi of kiwifruit rot disease were Botryosphaeria dothidea and Dothiorella gregaria. Meanwhile, the in vitro antifungal activity of 11 kinds of fungicides and 5 kinds of plant essential oils against B. dothidea and D. gregaria were determined and the results showed that all the tested fungicides and plant essential oils had a certain inhibitory effect on B. dothidea and D. gregaria. Among them, propiconazole had the best inhibitory effect on B. dothidea with an EC50 value of 4.10 mg/L, and quinolinone had the best inhibitory effect on D. gregaria with the EC50 value of 10.05 mg/L. Moreover, the pesticides and essential oils have practical application values for prevention and treatment of fruit rot diseases pathogens.

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“…Em Citrus sp. já foram identificadas outras duas doenças que levam à gomose, ambas causadas por fungos, gomose causada por Phytophtora citrophthora e gomose causada por Dothiorella gregária (MORAES et al, 2007). Em ambas as doenças há danos irreversíveis à produção e à longevidade das plantas.…”

Section: Introductionunclassified

Análise histopatológica e perfil protéico de lesões causadas pelo Citrus leprosis virus tipo nuclear e citoplasmático em Citrus sinensis (l.) Osbeck

Marques¹

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Histopathological analysis and proteic profile of lesions caused by Citrus leprosis virus nuclear and cytoplasmatic type in Citrus sinensis (L.) Osbeck The citrus leprosis of citrus has been considered a disease of great economic importance to citrus producers due to the damage that it causes. The disease is responsible for lesions found in the twigs, leaves and fruits, and it may cause great losses to the untreated orchards. The citrus leprosis has viral etiology being the virus called Citrus leprosis virus (CiLV). Currently, there are two types of virus attributed to leprosis that cause different morphological and cythopatological symptoms: the nuclear (CiLV-N) and cytoplasmic type (CiLV-C). This study aimed to investigate the anatomical changes and to compare the proteic profile between the injuries caused by two types of virus in sweet orange [Citrus sinensis (L.) Osbeck]. For anatomical analyses healthy tissue and different lesions were photographed and then fixed in Karnovsky solution, dehydrated in a graded ethylic series, embedded in hidroxy-ethyl methacrylate resin (Leica Historesin), sectioned (5 μm thick), stained and mounted in synthetic resin. The digital images were capture in a microscope with video camera. For the analysis of protein profiles the samples were collected and immediately cryofixed in liquid nitrogen and stored in the refrigerated-80 ° C. The proteins were extracted, quantified and then separated by gel electrophoresis of polyacrylamide gel. Foliar lesions began as necrotic spots surrounded by a yellow halo that inhibited the lesion expansion. The twigs presented two different lesions: depressed ones and pustules with ruptures. The collected-field lesions of leaves and twigs showed that symptoms of CiLV-C had a certain similarity with the inoculated samples. In the case of foliar lesions caused by CiLV-N there was the presence of three different regions: the necrotic center, the intermediate halo and chlorotic halo. The fruit lesions caused by both types of leprosis virus were different. Ductos traumáticos gomosos foram observados nos ramos infectados pelo CiLV-C e nos feixes vasculares de folhas e frutos infectados pelo CiLV-N. Gummous traumatic ducts in twigs infected by CiLV-C and in the vascular bundles of fruit and leaves infected with CiLV-N were observed. In the proteic profile, there was an increase in protein concentration in the infected tissues especially for injuries caused by CiLV-N. It was possible to observe that there was an anatomical and histochemical pattern in the lesions caused by leprosis in sweet orange independently of the type of virus, therefore in all the injuries was verified hyperplasia, hypertrophy, cell plasmolisis, the reduction of starch grains, the accumulation of lipids compounds in the cells of the necrotic areas and the presence of a halo, surrounding that area, constituted by cells that accumulate proteins.

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Suscetibilidade de três espécies cítricas à Dothiorella gregaria Sacc. em função do estado nutricional

Abstract: 7Susceptibilidade de três espécies cítricas à Dothiorella gregaria Sacc. em função do estado nutricional.Ciência Rural, v.37, n.1, jan-fev, 2007. Ciência Rural, Santa Maria, v.37, n.1, p.7-12, jan-fev, 2007 ISSN 0103-8478

Cited by 4 publications

References 16 publications

Avaliação da resistência de 47 acessos de mangueira aos fungos Fusicoccum aesculis e Neofusicoccum parvum

Avaliação da resistência de 47 acessos de mangueira aos fungos Fusicoccum aesculis e Neofusicoccum parvum

Identification of the Pathogens and Laboratory Bioactivity Determination of the Rot Disease of Kiwifruit (Actinidia spp.)

Análise histopatológica e perfil protéico de lesões causadas pelo Citrus leprosis virus tipo nuclear e citoplasmático em Citrus sinensis (l.) Osbeck

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