scholarly journals COMPORTAMENTO SINTOMATOLÓGICO TEMPORAL DA QUEIMA DAS FOLHAS DA CENOURA EM FUNÇÃO DA FLUTUAÇÃO POPULACIONAL DE ESPOROS DE Alternaria dauci NO AR

2021 ◽  
Vol 1 (12) ◽  
Author(s):  
Débora Fuchter ◽  
Leandro Luiz Marcuzzo
Keyword(s):  
Alternaria Dauci

Pouco se sabe sobre a epidemiologia da queima das folhas da cenouracausada pelo fungo Alternaria dauci . Com isso, o presente projeto teve comoobjetivo avaliar a epidemiologia da doença que servirá de base para o entendimentoda ocorrência doença no Alto Vale do Itajaí/SC. Sementes do cultivar Brasília foramsemeadas e avaliou-se semanalmente a severidade da doença em função daflutuação de esporos, coletados e quantificados em laboratório a 400 (x) deaumento. Conclui-se que a flutuação de esporos ocorre praticamente constantedurante o ciclo produtivo da cultura e aumento gradativo da doença com destaquepara as semanas finais.

Is there variety × isolate interaction in the polygenic quantitative resistance of carrot to Alternaria dauci?

Euphytica ◽  
2014 ◽  
Vol 202 (2) ◽  
pp. 235-243 ◽  
Author(s):  
V. Le Clerc ◽  
A. Suel ◽  
A. Pawelec ◽  
S. Marques ◽  
S. Huet ◽  
...  
Keyword(s):  
Quantitative Resistance ◽  
Alternaria Dauci

scholarly journals The Effect of Acetic Acid Treatments on the Quality of Stored Carrot (Daucus carota L.) Seeds

Agronomy ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1176
Author(s):  
Hanna Dorna ◽  
Agnieszka Rosińska ◽  
Dorota Szopińska
Keyword(s):  
Acetic Acid ◽  
Distilled Water ◽  
Storage Duration ◽  
Seed Vigour ◽  
Daucus Carota L ◽  
Two Samples ◽  
Before And After ◽  
Alternaria Dauci ◽  
Acid Treatments

Alternaria dauci (J.G. Kühn) J.W. Groves et Skolko and A. radicina Meier, Drechsler et E.D. Eddy are important seed-transmitted pathogens of carrot. The aim of this study was to evaluate the effects of acetic acid treatments on the quality of stored carrot seeds. Seeds of two samples were soaked for 30 min in 0.5, 1 and 2% acetic acid. Controls included untreated seeds, seeds soaked in distilled water and seeds treated with fungicide Zaprawa Nasienna T 75 WS/DS (a.i. thiram 75%). Germination, vigour and health of untreated and treated seeds were evaluated before and after 5 and 12 months of storage at 4 and 20 °C. Seeds of both samples treated with 0.5 and 1% acetic acid were characterized by higher germination capacity after storage than untreated seeds. However, treatments with 1 and 2% acetic acid negatively affected seed vigour. Generally, seeds of both samples treated with acetic acid were characterized by lower infestation with A. alternata and A. radicina after storage than untreated seeds and seeds soaked in distilled water. Moreover, acetic acid often controlled these fungi more effectively than the fungicide. Regardless of the storage duration, infestation with fungi was higher if seeds of both samples were stored at a lower temperature.

Alternaria dauci. [Distribution map].

1979 ◽  
Author(s):  
Keyword(s):  
Central America ◽  
Papua New Guinea ◽  
West Indies ◽  
New Caledonia ◽  
Far East ◽  
French Polynesia ◽  
Peninsular Malaysia ◽  
Distribution Map ◽  
Alternaria Dauci ◽  
New Distribution

Abstract A new distribution map is provided for Alternaria dauci (Kühn) Groves & Skolko. Hosts: Carrot (Daucus carota). Information is given on the geographical distribution in AFRICA, Angola, Ethiopia, Gambia, Ghana, Guinea, Kenya, Malawi, Mauritius, Morocco, Nigeria, Rhodesia, South Africa (Natal, Transvaal), Tanzania, Uganda, Zaire, Zambia, ASIA, Afghanistan, Hong Kong, India (Assam, Orissa), Indonesia, Israel, Japan, Kampuchea, Korea, Peninsular Malaysia (Sabah), Nepal, Oman, Philippines, Saudi Arabia, Sri Lanka, Taiwan, Thailand, USSR (Armenia) (Far East, W. Siberia), AUSTRALASIA & OCEANIA, Australia, Fiji, French, Polynesia (Tahiti), Hawaii, New Caledonia) New Zealand, Papua New Guinea, Tonga, EUROPE, Austria, Cyprus, Britain, Denmark, France, Germany, Greece, Italy (Sardinia), Netherlands, Norway, USSR (Lithuania), NORTH AMERICA, Bermuda, Canada, Mexico, USA (General), CENTRAL AMERICA & WEST INDIES, Antigua, Barbados, Belize, Costa Rica, Cuba, Dominica, Guadeloupe, Guatemala, Haiti, Honduras, Jamaica, Martinique, Nicaragua, Panama, Puerto Rico, Salvador, St. Vincent, Trinidad, SOUTH AMERICA, Brazil (E. Santo) (Rio G. do Sul) (Bahia), Peru, Venezuela.

Formation of chlamydospores and microsclerotia in Alternaria dauci

2010 ◽  
Vol 128 (3) ◽  
pp. 311-316 ◽  
Author(s):  
Anastasia L. Lagopodi ◽  
Georgios T. Tziros
Keyword(s):  
Alternaria Dauci

scholarly journals 2. Identificación morfológica y molecular de cepas del hongo (Alternaria dauci) patógeno de la zanahoria (Daucus carota L.)

2018 ◽  
Vol 11 (1) ◽  
pp. 21
Author(s):  
Adan Acevedo Cruz
Keyword(s):  
Daucus Carota ◽  
Daucus Carota L ◽  
Alternaria Dauci

La finalidad del estudio fue la identificación morfológica y molecular de las cepas de Alternaria dauci, causantes de la quemadura foliar de la zanahoria. Para ello, mediante técnicas convencionales se aislaron 50 cepas del hongo del cultivo de zanahoria, ubicada en el departamento de Landes al sudoeste de Francia. Las observaciones macroscópicas y microscópicas de las colonias mostraron que: 10 (42A, 42B, 25A, 37B, 22A, 12B, 2A, 22B, 12A y 25B) de las 50 cepas presentaron micelios de aspecto algodonoso, pigmentación rojo claro a marrón del Extracto de Malta Agar (EMA), conidióforos alargados y no ramificados, conidios ovalados con septos transversales y longitudinales. <br />Se realizó el monosporage de las 10 cepas con características propias de A. dauci se obtuvieron 40 cepas puras. De las cuales, la identificación molecular con la PCR, se logró amplificar el ADN de 30 cepas con los primers universales ITS1/ITS4 con una talla de 600 pb, y la verificación de estas cepas con la PCR utilizando los primers específicos Ada3 y Ada5 de A. dauci, reveló que 9 cepas puras: M25AA1, M12BA1, M12AA2, M37BA2, M22BB2, M25BB2, M42AB1, M42BB1 y M42BB2 pertenecen a la especie A. dauci con un peso molecular correspondiente a 159 pb.

scholarly journals Aldaulactone – An Original Phytotoxic Secondary Metabolite Involved in the Aggressiveness of Alternaria dauci on Carrot

2018 ◽  
Vol 9 ◽  
Author(s):  
Julia Courtial ◽  
Latifa Hamama ◽  
Jean-Jacques Helesbeux ◽  
Mickaël Lecomte ◽  
Yann Renaux ◽  
...  
Keyword(s):  
Secondary Metabolite ◽  
Alternaria Dauci

Breeding for carrot resistance to Alternaria dauci without compromising taste

2019 ◽  
Vol 39 (4) ◽  
Author(s):  
Valérie Le Clerc ◽  
Christophe Aubert ◽  
Valentine Cottet ◽  
Claire Yovanopoulos ◽  
Mathilde Piquet ◽  
...  
Keyword(s):  
Alternaria Dauci

scholarly journals Alternaria dauci (palež lišća mrkve) i učinkovitost mjera kemijske zaštite nekim novijim fungicidima

2017 ◽  
Vol 40 (6) ◽  
pp. 50-55
Author(s):  
Tanas Trajčevski
Keyword(s):  
Alternaria Dauci

Tijekom 2014. i 2015. godine izvršeno je ispitivanje djelotvornosti kemijske zaštite mrkve od napada patogena Alternaria dauci (Kuhn) Groves &amp; Skolko-uzročnika crnog sušenja te paleži lišća mrkve, u selu Stajkovci u okolici Grada Skoplja. Tijekom analize ispitana je učinkovitost zaštite od napada patogena Alternaria dauci (Kuhn) Groves &amp; Skolko novijim fungicidima u usporedbi s nekim starijim fungicidima, tretmanom u različitim uvjetima (oborine i vlage), odnosno u relativno vlažnoj 2014. godini i 2015., koja je bilježila manje oborina. Izvedenim pokusima utvrđeno je da je u 2014. godini, s mnogo oborina, najbolja djelotvornost postignuta primjenom fungicida Score 250 EC (difenakonazol) s indeksom učinkovitosti od 81,45%. Nešto manji indeks učinkovitosti 79,99%, te 79,53% pokazali su fungicidi Sighnum (boskalid + piroksistrobin) i Quadris (azoksistrobin). Fungicidi Dithane M-45 (mankozeb) i Kocide (bakarni hidroksid) pokazali su indeks učinkovitosti 68,38% ,odnosno 70,91%. Pri ispitivanjima u 2015. godini (manje oborina), najbolji indeks 93,62% pokazao je fungicid Score 250 EC (difenokonazol). Dobru učinkovitost je pokazao i fungicid Quadris (azoiksistrobin) s indeksom učinkovitosti od 91,97%. Nešto slabija učinkovitost je zabilježena kod fungicida Dithane M-45 (mankozeb) s indeksom učinkovitosti 75,85%.

scholarly journals Identification and Quantification of a Phytotoxic Metabolite from Alternaria dauci

Molecules ◽  
2020 ◽  
Vol 25 (17) ◽  
pp. 4003
Author(s):  
Martha Leyte-Lugo ◽  
Pascal Richomme ◽  
Pascal Poupard ◽  
Luis M. Peña-Rodriguez
Keyword(s):  
Limited Attention ◽  
Petroselinum Crispum ◽  
Tagetes Erecta ◽  
Hydroxybenzoic Acid ◽  
Pastinaca Sativa ◽  
Phytotoxic Activity ◽  
Alternaria Leaf Blight ◽  
Phytotoxic Metabolite ◽  
Alternaria Dauci ◽  
Chemical Correlation

Alternaria dauci is the causal agent of Alternaria leaf blight (ALB) in carrot (Daucus carota) crops around the world. However, to date, A. dauci has received limited attention in its production of phytotoxic metabolites. In this investigation, the bioassay-guided isolation of the extract from liquid cultures of A. dauci resulted in the isolation of two metabolites identified as α-acetylorcinol (1) and p-hydroxybenzoic acid (2), based on their spectroscopic data and results from chemical correlation reactions. Testing of both metabolites in different assays showed an important phytotoxic activity for p-hydroxybenzoic acid (2) when tested in the leaf-spot assay on parsley (Petroselinum crispum), in the leaf infiltration assay on tobacco (Nicotiana alata) and marigold (Tagetes erecta), and in the immersion assay on parsley and parsnip (Pastinaca sativa) leaves. Quantification of the two metabolites in the crude extract of A. dauci kept at different times showed that p-hydroxybenzoic acid (2) is one of the first metabolites to be synthesized by the pathogen, suggesting that this salicylic acid derivative could play an important role in the pathogenicity of the fungus.

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