SUMMARY: Three isolates of showing differing sensitivities to phosphonate were grown in the presence of a uniform concentration of the anion (1 mM), together with concentrations of phosphate which varied from zero to 3 mM. The phosphonate-sensitive isolate was inhibited by phosphonate at all levels of phosphate, but the resistant isolates were inhibited by phosphonate only when phosphate was limiting to growth and were able to exclude phosphonate more effectively than the sensitive isolate at higher concentrations of phosphate. The percentage inhibition in each strain was proportional to the internal concentration of phosphonate, but the slope of the plot of inhibition against internal phosphonate varied between strains. Differences in the capacity to discriminate between phosphate and phosphonate therefore provide part of, but not the whole explanation for differences in sensitivity between isolates. There was a significant increase in the internal concentration of orthophosphate in the mycelia which were inhibited by phosphonate.


Article metrics loading...

Loading full text...

Full text loading...


Most cited this month

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error