Ultrastructural Changes of Sphaerotheca fuliginea (Schlechtend.:Fr.) Pollacci in Cucumber After Treated by Chrysophanol
| Autor: | Hongmin Ren, Fan Fan, Ke-qiang Cao |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Ecology
biology Hypha Agriculture (General) chrysophanol food and beverages Germ tube Plant Science biology.organism_classification ultrastructure Biochemistry S1-972 Spore Microbiology Food Animals electronic microscopy Haustorium Ultrastructure Spore germination powdery mildew Animal Science and Zoology Agronomy and Crop Science Sphaerotheca Powdery mildew Food Science |
| Zdroj: | Journal of Integrative Agriculture, Vol 11, Iss 6, Pp 970-977 (2012) |
| ISSN: | 2095-3119 |
| DOI: | 10.1016/s2095-3119(12)60088-4 |
| Popis: | Chrysophanol (1,8-dihydroxy-3-methylanthraquinone) is a free anthraquinone compound and a secondary metabolite of medicinal plant rhubarb. Chrysophanol has been reported to have both protective and curative activity against Sphaerotheca fuliginea (Schlechtend.:Fr.) Pollacci, the causal agent of cucumber powdery mildew. In this paper the ultrastructure of powdery mildew on cucumber leaves was studied using electron microscopy after the leaves were treated with chrysophanol. Results showed that preventive treatments with chrysophanol affected fungal development, including spore germination, appressorial formation, and penetration. In the curative treatment, chrysophanol affected fungal survival, resulting in broken cell wall of germ tubes, swelling and collapse of hyphal tips, hyphal malformation, delayed and reduced sporulation. The morphological changes induced by chrysophanol at the ultrastructural level were reflected by haustorium deformation, vacuolization, abortion, and necrosis. Host cell walls infected or adjacent to haustoria were thickened. All these morphological changes of S. fuliginea further confirmed the fungicidal activity of chrysophanol on powdery mildew of cucumber. |
| Databáze: | OpenAIRE |
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