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Published on: October 28, 2021
Influence of inoculum preparation on the growth of Penicillium chrysogenum
M Sautour1, P Dantigny, M-C Guilhem
1Laboratoire de Microbiologie, UMR INRA, Dijon, France.
Aims:
The influence of the spore preparation on subsequent fungal growth of Penicillium chrysogenum was assessed.
Methods And Results:
The influence of four factors [the nature of the diluting solution (physiological water and physiological water added with Tween-80), the age of the sporulating culture (4, 8 and 12 days), the strain (737, 738 and 740) and the inoculum size (102, 103, 104 and 105 spores ml(-1)] on two responses (i.e. the radial growth rate, mu, and the lag time, lambda) was studied using an experimental screening methodology.
Conclusions:
The main conclusion was the strong effect of the inoculum size on lambda. In contrast, the diluting solution had no effect on both the experimental responses. In order to obtain the highest growth rates, it is recommended to use 4-day-old sporulating cultures with an inoculum size of 102 spores ml(-1).
Significance And Impact Of The Study:
There is a need for standardizing spore preparation in predictive mycology. The screening methodology is a powerful tool to determine the influence of qualitative and quantitative factors on various biological responses and can be applied widely in microbiology.
Insights
Optimizing Penicillium chrysogenum growth requires careful spore preparation. Using a 4-day-old culture with 102 spores/mL maximizes fungal growth rates.
Area of Science:
- Microbiology
- Mycology
- Fungal Growth Dynamics
Background:
- Spore preparation significantly impacts fungal growth.
- Standardization is crucial for predictive mycology.
Purpose of the Study:
- To assess the influence of spore preparation on Penicillium chrysogenum growth.
- To identify optimal conditions for maximizing fungal growth rates.
Main Methods:
- Experimental screening methodology was employed.
- Investigated factors included diluent, culture age, strain, and inoculum size.
- Measured radial growth rate (mu) and lag time (lambda).
Main Results:
- Inoculum size strongly affected lag time (lambda).
- Diluting solution had no significant effect on growth rate or lag time.
- 4-day-old cultures and an inoculum size of 102 spores/mL yielded the highest growth rates.
Conclusions:
- Inoculum size is a critical factor in fungal lag time.
- Standardized spore preparation protocols are needed for reliable predictive mycology.
- Screening methodology is effective for analyzing biological responses.
