ศูนย์นวัตกรรมเทคโนโลยีหลังการเก็บเกี่ยว

Papaya latex, a potential postharvest fungicide.

Indrakeerthi, S. R. P.; Adikaram, N. K. B.;

Proceedings of the Australasian postharvest horticulture conference 'Science and technology for the fresh food revolution', Melbourne, Australia, 18-22 September, 1995. Year: 1996 Pages: 423-427 Ref: 11 ref.

1996

บทคัดย่อ

Papaya (Carica papaya)[pawpaw] latex is a complex mixture of enzymes notably proteases, glycosidases, chitinase, lipases and simple sugars. The water soluble fraction of pawpaw latex can completely digest the conidia of many fungi, including several important postharvest pathogens, upon brief exposure in vitro. Conidia of many other fungal species lost their viability when exposed to latex. Rhizopus arrhizus was exceptional as it infected unripe pawpaw fruits containing latex and grew profusely in the presence of pawpaw latex. The latex exhibited properties of an excellent natural fungicide. Application of latex to the crowns of boxed bananas preinoculated with a mixture of conidia of Fusarium sp. and Colletotrichum musae completely inhibited crown rot development. The latex-treated crowns developed a black coloration but remained hard possibly due to a defence response. Latex application immediately after dehanding was not effective, due to the coagulation of proteins in the pawpaw latex by a p

olymeric carbohydrate present in banana latex. Fungal colonisation of the shell of wood apples (Limonia acidissima) during ripening was also significantly reduced by dip treatment with pawpaw latex at unripe stage. Similar treatment of unripe banana and avocado fruits with pawpaw latex enhanced anthracnose and stem-end rotting.