Data/hora: 03/07/2024 13:38:45

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	08/08/2017	
Data da última atualização: 	08/08/2017	
Autoria: 	STADNIK, M. J.; FREITAS, M. B.; ARAUJO, L.; PERUCH, L. A. M.; WORDELL FILHO, J. A.; PAULERT, R.; NOSEDA, M. D.	
Título: 	Resistance induced by ulvans against plant pathogenic fungi.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	In: EUROPEAN FOUNDATION FOR PLANT PATHOLOGY, 12., FRENCH SOCIETY FOR PLANT PATHOLOGY, 10., 2017, Dunkerque. Abstracts... French: European Foundation for Plant Pahtology, 2017.	
Idioma: 	Inglês	
Conteúdo: 	Ulvans   are     water-soluble   sulfated        heteropolysaccharides   extracted       from    the     cell    walls   of     
green   marine  macroalgae      Ulva    spp.    and     are     able    to      induce  systemic        resistance      in      plants. The     aim     of      
this     report  is      to      summarize       the    main     results         of      our     research        group,  from    discovery       to      attempts        in     
elucidating      the    mechanisms       of     action.  A       bioprospecting  study   carried         out     between         2002   and      2004   
identified       Ulva    fasciata Delile         as      a       potential       source  of      active  compounds       for     controlling     plant  
diseases.       In      greenhouse,     spray   of      Ulva extracts   reduced (about  80%)    the     number  of      powdery mildew  
colonies        on      pre-treated     leaves. When    applied under   field   conditions,     sprays  of      the     algal   extracts        were    
also     able    to      control         anthracnose     by      50%     in      a       highly  susceptible     bean    cultivar.       Follow-up       studies        
revealed        that    ulvans  were    the     main    elicitor        molecules       in      the     extracts        of      Ulva.   In      greenhouse,     ulvans  
demonstrated    to      protect several crop    plants  such    as      beans,  apple,  grapevine       and     cereals (e.g.   wheat   
and     barley) against a       broad   range   of      foliar  phytopathogens, including       biotrophic,     hemibiotrophic  and     
necrotrophic     fungi.  Pretreatment    of      barley  leaves  with    ulvans significantly    reduced         the     severity        of     
Blumeria         graminis by     80%,    and     in      cereals,        priming         effect  was     detected        in      assays  with    suspensioncultured
cells.  Resistance      induced by      ulvans  reduced the     bean    anthracnose     severity        by      50%,    lasting at      
least   up      to      nine    days    after   treatment.      Protection      levels  of      65%     were    recorded        in      ulvans-treated  apple   
plants  against the     Glomerella      leaf    spot,   but     the     effect  was     weaker  in      not-directly    treated distal  parts.  
Jasmonic         acid    pathway         as      well    the     enzyme  NADPH   oxidase         were    triggered during        ulvan-induced  
resistance       in      Arabidopsis     thaliana.       These   findings        may     open    new     horizons        for     using   the     algal  
polysaccharides as      resistance      inducers.	
Palavras-Chave: 	Priming effect; resistance; Ulva fasciata.	
Categoria do assunto: 	F Plantas e Produtos de Origem Vegetal	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_39522.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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