Distributions of the growth rate of the germ tubes and germination time of Penicillium chrysogenum conidia depend on water activity.

Abstract:

:The effects of water activities for sporulation (a(wsp)) and germination (a(wge)) on the distributions of the growth rate of the germ tubes (mu) and the germination time (t(G)) of Penicillium chrysogenum conidia were determined by monitoring the length of the same germ tubes throughout the experiments automatically. No relationship between the individual t(G)'s and mu's could be established. Irrespective of the water activity for germination, mu was greater and t(G) was less for conidia produced at 0.95a(wsp) than that at 0.99a(wsp). At 0.99 a(wge) the mean and the standard deviation of t(G) were smaller than those obtained at 0.95a(wge). At 0.99a(wge), normal distributions for mu and t(G) were exhibited, but not at 0.95a(wge). The cumulative frequencies were used to reconstruct the germination curves. Great differences in the percentage of spores capable of germination (P(G)) and in the mean germination times between conidia produced at 0.95a(wsp) and at 0.99a(wsp) were clearly exhibited at 0.95a(wge), thus demonstrating the paramount influence of sporulation conditions on germination kinetics.

journal_name

Food Microbiol

journal_title

Food microbiology

authors

Judet D,Bensoussan M,Perrier-Cornet JM,Dantigny P

doi

10.1016/j.fm.2008.05.007

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

902-7

issue

7

eissn

0740-0020

issn

1095-9998

pii

S0740-0020(08)00087-7

journal_volume

25

pub_type

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