The effect of sugarcane extracts on the growth of the pathogenic fungus, Colletotrichum falcatum

• Published in: Physiological and molecular plant pathology Vol. 30; no. 2; pp. 299 - 308
• Main Authors: Godshall, M.A., Lonergan, T.A.
• Format: Journal Article
• Language: English
• Published: London Elsevier India Pvt Ltd 01.03.1987; Elsevier
• Subjects: Biological and medical sciences; Fundamental and applied biological sciences. Psychology; Fungal plant pathogens; Pathology, epidemiology, host-fungus relationships. Damages, economic importance; Phytopathology. Animal pests. Plant and forest protection; GC; RRP; ISP; Monocotyledones; Extract; Phytopathogen; Spores; Antifungal agent; Gramineae; Angiospermae; Pigments; Chemical composition; Constituent; Growth inhibitor; Germination; Tropical crop; Host agent relation; In vitro; Biological activity; Sugar plant; Red; In vivo; Sensitivity resistance; Saccharum officinarum; Phytoalexin; Plant origin; Phenols; Spermatophyta; Mycelium
• ISSN: 0885-5765; 1096-1178
• DOI: 10.1016/0885-5765(87)90043-9

A red pigment which is induced in sugarcane stalks ( Saccharum officinarum L.) upon infection with Colletotrichum falcatum Went was assayed for its effect on spore germination and radial mycelial growth of C. falcatum. The pigmented extracts from infected plants inhibited both spore germination and radial mycelial growth. The inhibition caused by the pigment was modulated by the presence of growth stimulating factors in the sugarcane extracts. Partial characterization of the crude pigment showed the presence of luteolinidin, luteolin, chlorogenic acid and a glucoside of luteolinidin. While in vitro spore germination was inhibited by the pigment, spores exposed to extracts from uninfected sugarcane stalks had nearly completed germination within 14 h. The first pigment component in infected tissue did not appear until at least 24 h after infection, indicating that the pigment components may function to slow the growth and spread of the mycelia in vivo but may not play a role in controlling spore germination in vivo. The concentration of phenolic compounds in the cane tissue could not be correlated with resistance to C. falcatum.