Cette recherche s'applique uniquement aux ressources en bibliothèque.
5 résultats
Trier par:
Ajouter à la liste:
    • Plusieurs versions

    Plant pathology and plant pathogens

    Lucas, John Alexander
    • Livre
    Sélectionner
    Plus…
    Chargement
    Erreur de chargement
    Titre: Phytophthora : Symposium of the British Mycological Society, the British Society for Plant Pathology and the Society of Irish Plant Pathologists held at Trinity College, Dublin, September 1989 / ed. by J.A. Lucas... [et al.] ; publ. for the British Mycological Society
    Auteur: Lucas, John Alexander
    Editeur: Cambridge ; New York [etc.] : Cambridge Univ. Press
    Date: 1991
    Collation: XIII, 447 p. : ill. ; 24 cm
    Collection: British Mycological Society symposium series ; 17
    Documents dans cette collection: British Mycological Society Symposium Series
    Congrès: British Mycological Society. Symposium (1989 : Dublin) - British Society for Plant Pathology. Symposium (1989 : Dublin) - Society of Irish Plant Pathologists. Symposium (1989 : Dublin)
    Classification: IBOT G-4086
    Identifiant: 0521400805 (ISBN)
    No RERO: 1539068
    Permalien:
    http://data.rero.ch/01-1539068/html?view=FR_V1

    • Article
    Sélectionner

    Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment

    López , Ana Maria Queijeiro, Lucas , John Alexander
    Scientia Agricola, 2010 [Revue évaluée par les pairs]
    AGRIS (Food and Agriculture Organization of the United Nations)
    Disponible
    Plus…
    Titre: Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment
    Auteur: López , Ana Maria Queijeiro; Lucas , John Alexander
    Sujet: Anacardium Occidentale ; Anthracnose ; Resistance ; Aggressiveness ; Anacardium Occidentale ; Antracnose ; Resistência ; Agressividade
    Description: The cashew (Anacardium occidentale L.) crop is an important source of income for the population of the Brazilian Northeast, and anthracnose disease caused by Colletotrichum gloeosporioides leads to significant production loss. However, there is little information on either the host resistance or the variation in the aggressiveness of the pathogen under controlled environment. The reaction of commercial (CCP-06, CCP-09, CCP-76 and CCP-1001) and one non-commercial (CAP-14) dwarf cashew clones was assessed against 36 isolates of this fungus controlled environmental conditions. All the isolates, including those from hosts other than cashew, were able to cause lesions on leaves and stems of most clones, albeit to different degrees. Clone CCP-06 was the most susceptible, while clone CCP-1001 showed a level of resistance to a number of the isolates, including isolate 905, while isolates 910 and 912 were aggressive to all clones. Injury increased the susceptibility of the clones to all isolates, indicating that resistance also might be associated with structural barriers that hinder penetration. Ripened cashew apples (8-week-old), of commercial clones were susceptible to isolates 905 and 910. Immature pseudo-fruits (2-week-old), with exception of clone CCP-76 which was susceptible to both isolates showed resistance against these isolates, suggesting the presence of structural and chemical barriers. Developed nuts (8-week-old), however, were more resistant than immature nuts (2-week-old) to both isolates, probably due to their thicker exocarp cuticle and reduced number of stomatal pores.
    A cultura de caju (Anacardium occidentale L.) é uma fonte de renda importante para a população do Nordeste brasileiro, sendo a antracnose causada por Colletotrichum gloeosporioides a doença que mais conduz a perdas de sua produção. Entretanto, há pouca informação para a resistência desse hospedeiro ou para a variação na agressividade do patógeno em ambiente controlado. A reação de clones comerciais (CCP-06, CCP-09, CCP-76 e CCP-1001) e um não comercial (CAP-14) de cajueiros anão-precoce, contra 36 isolados desse fungo, foi avaliada sob condições controladas. Todos os isolados, incluindo os provenientes de diferentes hospedeiros, foram capazes de causar lesões sobre folhas e hastes da maioria dos clones, ainda que em graus diferenciados. O clone CCP-06 foi o mais suscetível, enquanto o clone CCP-1001 foi resistente a mais isolados, incluindo o 905, enquanto os isolados 910 e 912 foram agressivos a todos os clones testados. A injúria mecânica das folhas aumentou a suscetibilidade dos clones a todos os isolados, indicando que a resistência pode também estar associada a barreiras estruturais que impedem a penetração. Os pseudofrutos amadurecidos (8 semanas) dos clones comerciais avaliados, foram suscetíveis a ambos os isolados testados (905 e 910), mas os jovens (2 semanas), com exceção daqueles do clone CCP-76, suscetíveis aos dois isolados, apresentaram resistência a ambos, sugerindo a ação de obstáculos estruturais e químicos diferenciados. As castanhas desenvolvidas (8 semanas), no entanto, foram mais resistentes a ambos os isolados do que as jovens (2 semanas), talvez devido à espessa cutícula do exocarpo e baixo número de estômatos.
    Fait partie de: Scientia Agricola, 2010
    Identifiant: 0103-9016 (ISSN); (DOI)

    • Article
    Sélectionner

    Colletotrichum isolates related to Anthracnose of cashew trees in Brazil: morphological and molecular description using LSU rDNA sequences

    Lopez , Ana Maria Queijeiro, Lucas , John Alexander
    Brazilian Archives of Biology and Technology, 2010 [Revue évaluée par les pairs]
    AGRIS (Food and Agriculture Organization of the United Nations)
    Disponible
    Plus…
    Titre: Colletotrichum isolates related to Anthracnose of cashew trees in Brazil: morphological and molecular description using LSU rDNA sequences
    Auteur: Lopez , Ana Maria Queijeiro; Lucas , John Alexander
    Sujet: Anthracnose ; Inflorescence Blight ; Colletotrichum ; Rdna ; Cashew ; Anacardium Occidentale
    Description: Thirty six isolates of fungi obtained from anthracnose lesions of cashew and associated host plants in Brazil, were compared by their cultural, morphological and partial sequences of the 28S ribosomal DNA characters. They showed a high degree of cultural variability. The average mycelial growth rate on all tested media ranged from 10.2-13.3 mm/day between the isolates. Most of them produced perithecia (sterile and fertile) and some produced setae (sterile and fertile). All the isolates produced acervuli with predominantly cylindrical conidia (12.4-17.7 µmX 4.8-6.0 µm in width) with round ends, which became septate on germination, and produced unlobed or slightlylobed appressoria. Comparison of the D2 domain of the large subunit (LSU) rDNA sequences with those of other defined species of Colletotrichum and Glomerella grouped 35 of the isolates with known strains of C. gloeosporioides from different hosts (> 98.9% homology). The one exception (LARS 921) was identical to G. cingulata (LARS 238) from Vigna unguiculata.
    Trinta e seis isolados de fungos obtidos de lesões de antracnose em cajueiros e outras plantas consorciadas no Brasil, foram comparados quanto a seus aspectos culturais, morfológicos e seqüências parciais do rDNA 28S. Os isolados apresentaram elevado grau de variabilidade cultural, com taxa de crescimento médio, em todos os meios testados, entre 10,2 e 13,3 mm/dia. A maioria deles produziu peritécios (estéreis e férteis), e alguns produziram setas (estéreis e férteis) nos diferentes meios. Todos apresentaram acérvulos com predominância de conídios cilíndricos (12,4-17,7 µm X 4,8-6,0 µm), de extremidades arredondadas, formando septos durante a germinação e produzindo apressórios ligeiramente lobados ou lisos. Comparando as seqüências do domínio D2 da larga subunidade (LSU) do rDNA dos isolados com aquelas já identificadas de espécies de Colletotrichum/ Glomerella, verificou-se que 35 deles correspondem a C. gloeosporioides (> 98,9% de homologia), e um deles, o isolado 921, é idêntico a G. cingulata (LARS 238) de V. unguiculata.
    Fait partie de: Brazilian Archives of Biology and Technology, 2010
    Identifiant: 1516-8913 (ISSN); (DOI)

    • Plusieurs versions

    Reaction of dwarf cashew clones to Colletotrichum gloeosporioides isolates in controlled environment

    López, Ana Maria Queijeiro, Lucas, John Alexander
    Scientia Agricola, 01 April 2010, Vol.67(2), pp.228-235 [Revue évaluée par les pairs]