Fungal turgor pressure is directly involved in the hyphal growth rate

From a rigorous momentum balance it was shown that fungal turgor pressure c an be expressed as a sum of two components: a) a static contribution, relat ed to the membrane elastic properties and resolved by capillary probe measu rements; b) a dynamic part (Delta P), responsible for the hyphal extension rate and proportional to it. Both contributions add up and explain why some researchers have found hypha e growing at finite rates when the capillary probe measures no pressure dif ference at all. This approach was applied to Aspergillus oryzae and we have found an increa sing relation between the dynamic part of turgor pressure (Delta P) and hyp hal extension rate.