Estimation of the Generation Time and Peripheral Growth Zone of Aspergillus nidulans and Alternaria solani Hyphae from Radial Growth Rates and Ranges in Apical Cell Length

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Abstract
It is concluded that the peripheral growth zone has been overestimated by previous workers and that it lies approximately half-way between the longest apical cells. As the linear growth of the hypha is constant, the peripheral growth zone must also remain constant. In short apical cells, compartments behind the apical cell must contribute to growth whereas in the longest apical cells only about 72% of the cytoplasm is contributing to tip growth. An analysis is presented which gives a simple method for calculating the generation time and peripheral growth zone from measurements of the radial growth of hyphae and the difference in length between the longest and shortest apical cells.

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