Data/hora: 10/06/2024 08:19:45

Provedor de dados: 	87	
País: 	Brazil	
Título: 	Effects of Corynespora cassiicola on Lantana camara	
Autores: 	Passos,J.L.; Barbosa,L.C.A.; Demuner,A.J.; Barreto,R.W.; King-Diaz,B.; Lotina-Hennsen,B.	
Data: 	2010-06-01	
Ano: 	2010	
Palavras-chave: 	Allelopathy; Bioassays; Photosynthesis inhibitor; Phytotoxicity.	
Resumo: 	The present study combines the examination of toxins produced by C. cassiicola and the effects of the fungus colonization on L. camara. C. cassiicola was cultivated on solid media and the crude extracts CAE and CE were produced. Both extracts were submitted to a seed germination and growth assay utilizing Physalis ixocarpa, Trifolium alexandrinum, Lolium multiflorum and Amaranthus hypochodriacus. The effect of the extracts on the ATP-synthesis in isolated spinach chloroplasts was also tested. Bioassay guided chromatographic fractionation identified the most active extract (CAE). From this extract ergosta-4,6,8(14),22-tetraen-3-one (C1) and fatty acids were isolated. The C1 compound reduce ATP synthesis in isolated spinach chloroplasts. The interference of fatty acids with ATP synthesis and also with weed growth provides one explanation of the phytogrowth-inhibitory properties of such fungal extracts. Histological observations involving fungus-plant interaction were made on L. camara plants inoculated with C. cassiicola conidia suspension. After inoculations, fragments of the leaf blades were prepared for observation by light and scanning electron microscopy. Fungal colonization of Lantana camara was typical of a necrotroph and penetration initiated a hypersensitive response. L. camara reacted to the pathogen penetration through thickening of the epidermis walls, cytoplasm granulation and a cicatrisation tissue.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582010000200001	
Editor: 	Sociedade Brasileira da Ciência das Plantas Daninhas	
Relação: 	10.1590/S0100-83582010000200001	
Formato: 	text/html	
Fonte: 	Planta Daninha  v.28 n.2 2010	
Fonte: 	info:eu-repo/semantics/openAccess