Histopathology of S. tanaceti infection in pyrethrum leaf lamina

The infection process and life cycle of S. tanaceti in leaf lamina of pyrethrum plants was investigated using histopathology. Conidia attached firmly to the leaf surface before the infection hyphae penetrated directly into the epidermal cells of the leaf without forming appressoria. The maximum germ...

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Bibliographic Details
Published in:Australasian plant pathology 2015-11, Vol.44 (6), p.629-636
Main Authors: Bhuiyan, M. A. H. B., Groom, T., Nicolas, M. E., Taylor, P. W. J.
Format: Article
Language:English
Subjects:
Agriculture
Appressoria
Biomedical and Life Sciences
Colonization
Conidia
Ecology
Entomology
Germination
Histopathology
Hyphae
Infections
Lamella
Leaves
Life cycles
Life Sciences
Original Paper
Parenchyma
Plant Pathology
Plant Sciences
Plant tissues
Plants
Pycnidia
Stain
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Summary:The infection process and life cycle of S. tanaceti in leaf lamina of pyrethrum plants was investigated using histopathology. Conidia attached firmly to the leaf surface before the infection hyphae penetrated directly into the epidermal cells of the leaf without forming appressoria. The maximum germination of conidia on leaf surface was 85 % at 54 HAI. Infection hyphae infected the epidermal and palisade parenchyma cells through the middle lamella. Brown lesions on the leaf were a result of infected necrotic epidermal cells. Extensive colonization through both intra- and intercellular hyphae along with pycnidia formation caused enormous damage to the infected cells at 12 DAI. Unlike the quadruple stain, both single and dual stains had very limited ability to visualise infection structures. These results have provided a better understanding of the physical interaction between the pathogen and the pyrethrum leaf tissues and will help to elucidate the complete disease cycle of S. tanaceti on pyrethrum plant.
ISSN:0815-3191
1448-6032
DOI:10.1007/s13313-015-0377-0