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Abstract
Use is described of a theoretical model to predict the extent of growth of the soil-borne wheat root pathogen Gaeumannomyces graminis var. tritici over a range of soil water contents. Degree of soil pore saturation (or percentage water-filled pores, % WFP) is presented as a measure of soil water content which best reflects the activities of soil micro-organisms under varying amounts of soil water or bulk density. The extent of Ggt growth towards wheat roots was not affected in the range 40–70% WFP. At the highest soil water content tested, viz. 80% WFP, a reduction in growth was predicted by the model which was based on actual numbers of roots remaining uninfected. Implications for root infection of wheat growing in soils which are subject to temporary waterlogged conditions are presented. This modelling approach is proposed as a means of examining the influence of soil conditions on microbial-root interactions.
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