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- Title
Histological investigation of stripe rust ( Puccinia striiformis f.sp. tritici) development in resistant and susceptible wheat cultivars.
- Authors
Moldenhauer, J.; Moerschbacher, B. M.; van der Westhuizen, A. J.
- Abstract
The wheat cultivar Kariega expresses complete adult plant resistance against stripe rust, whereas cv. Avocet S is susceptible. Using confocal laser scanning microscopy, initial fungal penetration into flag leaves was identical in both cultivars, with directional germ-tube growth towards stomata that were penetrated without the formation of an appressorium, followed by differentiation of a substomatal vesicle, infection hyphae, haustorial mother cells and haustoria. During the following 4 days, further fungal development occurred more quickly in the resistant than in the susceptible cultivar. However, by 7 days postinoculation (dpi) the situation changed, with exponential growth of the pathogen occurring only in the susceptible line. Induced cellular lignification, a typical defence reaction of cereals, was observed at 4 dpi in the resistant cultivar, and 2 days later lignified tissue completely surrounded the fungal colonies. In the susceptible cultivar, isolated lignified host cells occurred at 6 dpi, and long, unbranched fungal hyphae outgrowing the resistance reaction were observed.
- Subjects
STRIPE rust; CULTIVARS; PLANT resistance to viruses; LEAF anatomy; PARASITIC plants; GRASS diseases &; pests; WHEAT rusts; LEAF rust of wheat; DISEASE resistance of plants
- Publication
Plant Pathology, 2006, Vol 55, Issue 4, p469
- ISSN
0032-0862
- Publication type
Article
- DOI
10.1111/j.1365-3059.2006.01385.x