caa a22 4500 465725538 CHVBK 20180323111728.0 cr unu---uuuuu 170327e19901201xx s 000 0 eng 10.1071/APP9900115 doi (NATIONALLICENCE)springer-10.1071/APP9900115 The mechanism of phosphonic (phosphorous) acid action in Phytophthora [Elektronische Daten] [B. Grant, R. Dunstan, J. Griffith, J. Niere, R. Smillie] Phosphonates exhibit a complex mode of action in their control of fungi. Using Phytophthora palmivora as a model, we have shown that phosphonate anion can act directly on the fungus, reducing growth, and that growth reduction is associated with a rapid reduction in the total pool of adenylate. At lower concentrations, phosphonate alters fungal metabolism without reduction in growth rate. Under these conditions there is a reduction in the amount of macromolecular materials which can be washed from the surface of the mycelia grown on an agar plate. We suggest that these materials contain suppressors, which normally act to delay the expression of the host defence systems. Therefore, a reduction in their synthesis induced by phosphonate could alter the host response and change the host reaction from compatible to incompatible. Superimposed on these effects is that of orthophosphate, which competes for the same carrier as phosphonate and determines the rate at which phosphonate is absorbed into the fungus. Australasian Plant Pathology Society, 1990 Grant B. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut Dunstan R. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut Griffith J. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut Niere J. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut Smillie R. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut Australasian Plant Pathology Springer Netherlands 19/4(1990-12-01), 115-121 0815-3191 19:4<115 1990 19 13313 https://doi.org/10.1071/APP9900115 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1071/APP9900115 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Grant B. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut NATIONALLICENCE 700 1- Dunstan R. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut NATIONALLICENCE 700 1- Griffith J. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut NATIONALLICENCE 700 1- Niere J. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut NATIONALLICENCE 700 1- Smillie R. Russell Grimwade School of Biochemistry, Melbourne University, 3052, Parkville, Victoria aut NATIONALLICENCE 773 0- Australasian Plant Pathology Springer Netherlands 19/4(1990-12-01), 115-121 0815-3191 19:4<115 1990 19 13313 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer