Soil water pressure and Verticillium dahliae interactions on potato Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/kp78gk096

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  • A greenhouse experiment was conducted in 1991 and in 1992 to determine the effect of soil water pressure on potato (cv Russet Burbank) plant growth and infection by Verticillium dahliae. Soil water pressures of -0.01, -0.03, -0.08, or -0.15 MPa were combined factorially with two inoculum concentrations, 0 or 10 and 0 or 25 colony forming units per gram of soil in 1991 and 1992, respectively. Plants were sampled destructively over a 4 wk period. Dry weight of foliage, fresh weight of below ground plant material, root length, and root and vascular colonization by V. dahliae were determined. In weeks 3 and 4, change in foliar dry weight in response to the level of one independent variable depended on the level of the other. This interaction between soil water pressure and inoculum density was such that foliar dry weight was reduced in infested compared to noninfested soil at -0.01 MPa but not at other soil water pressures. There were no significant main effect interactions on below ground fresh weight or on root length. There was, however, a main effect of soil water pressure on root length in which length decreased as soil water pressure increased. In both years, colony density in roots (cfu/cm or cfu/g) was reduced at -0.01 MPa compared to lower soil water pressures. Colonization of vascular tissue (cfu/ml stem sap) was significantly reduced at -0.01 MPa compared to lower soil water pressures. Although V. dahliae and soil water pressure at -0.01 MPa interactively reduced foliar growth of plants, there were no corresponding significant increases in population densities of the pathogen in roots or stems.
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