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Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 10/04/1995
Data da última atualização: | 10/04/1995
Autoria: | SAKAI, T.; NAKAGAWA-MURATA, Y.; URITANI, I.; DATA, E. S.
Título: | Occurrence and characteristics of stress metabolites in cassava rots.
Ano de publicação: | 1994
Fonte/Imprenta: | Tokyo, Japan: Japan Scientific Societies Press, 1994.
Páginas: | p.95-110
ISBN: | 4-7622-7755-X
Idioma: | Inglês
Notas: | In: URITANI, I.; GARCIA, V. V.; MENDOZA, E. M. Postharvest Biochemistry of plant food-materials in the tropics.
Conteúdo: | When cassava (M. esculenta) root is damaged by cutting (physiologically)or by fungal infection (microbially), the tissues accumulate several abnormal secondary metabolites such as coumalinic (scopoletin, scopolin, and esculin) and phenolic (catechin) compounds in the injured or infected regions. A comparative GC/MS study between the compounds present in deteriorated root tissues and those in healthy tisssues revealed that a number of stress metabolites were porduced in the former tissues. The stress metabolites can be classified into two groups by MC: four steriods and more than twenty diterpenoids. Steroidal stress metabolites appear to be produced by enzymatic oxidation of the original sterols. Twenty-two diterpenic stress metabolites, most of which are novel, have been isolated and identified from root tissues damaged by cutting or fungal infection. Diterpenic stress metabolites fall into four families: ent-beyerane (10 components), ent-pimarane ( 9 components), ent-atisane (2 components), and ent-kaurane (1 component). Diterpenes are not common as stress metabolites in plants. One of the most abundant constituents of stress metabolites is the biter principle in damaged tissues. It may be possible that these stress metabolites are related to some defense compounds belonging to phytoalexin which are toxic to man and livestock.
Palavras-Chave: | Alimentacao animal; Cromotografia; Doencas; Humana; Matasequoia glyptostroboides.
Thesagro: | Consumo; Deterioração; Manihot Esculenta.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (13502-1) - ADD - PL - -- - 581.192 - U76p - 1994000158 - DIS