When stationary phase cells of the dimorphic yeast are diluted into fresh medium at pH 4.5 (low pH), they synchronously form ellipsoidal buds, but when diluted into the same medium at pH 6.7 (high pH), they synchronously form elongate mycelia. Using a perfusion chamber to monitor single cells, we have compared the rates of volume growth between budding and mycelium-forming cells. Results are presented which demonstrate that: (1) after release from stationary phase into medium of low or high pH, each original sphere grows in volume to the time of initial evagination, but does not grow subsequently; (2) successive budding on the original mother cell occurs without interruption resulting in continuous volume growth; however, an interruption in volume growth of the initial bud (B1) occurs before it in turn evaginates; and (3) the rate of volume growth of the first bud at low pH is identical to the rate of volume growth of the mycelium at high pH even though the surface to volume ratios are quite different. The last result is unexpected and is therefore considered in relation to cell wall deposition.


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