GrainGenes Reference Report: PHY-91-240
Reference
PHY-91-240
Title
A model of the effect of pseudothecia on genetic recombination and epidemic development in populations of Mycosphaerella graminicola
Journal
Phytopathology
Year
2001
Volume
91
Pages
240-248
Author
Eriksen L Shaw MW Ostergard H
Abstract
Summary: It is generally agreed that ascospores are the origin of primary infections for the disease septoria tritici blotch of wheat caused by the fungus Mycosphaerella graminicola (anamorph Septoria tritici). The epidemic during the growing season was previously ascribed to the asexual pycnidiospores dispersed over short distances by rain splash, but recent observations suggest that the airborne ascospores also may play a role. As a consequence, the composition of the pathogen population over the growing season may change through genetic recombination. In an attempt to resolve the relative importance of the two spore types to the epidemic over the growing season, a model simulating disease caused by both types of spores was constructed and analyzed. The conclusion from the analysis of this model is that sexual recombination will affect the genetic composition of the population during a growing season. A considerable proportion of spores released at the end of the growing season may be sexual descendants of the initial population. However, ascospores are unlikely to affect the severity of the epidemic during the growing season. This is due to the much longer latent period for pseudothecia compared with pycnidia, resulting in ascospores being produced too late to influence the epidemic
Keyword
ascospores
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: PHY-91-240
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||