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Ca2+-dependent induction of conidiation in submerged cultures of Trichoderma viride

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The presence of Ca2+ (up to 0.1 mol/L) in the cultivation media was found to induce the formation of conidia in submerged mycelia of Trichoderma viride in a concentration-dependent manner. Ca2+ dramatically stimulated conidiation after 70 h of cultivation. The effect was present in the dark, and illumination stimulated it only marginally. Low (less than 100 mol/L) Ca2+ concentrations induced the formation of chlamydospores. Sr2+ could substitute Ca2+ in conidiogenesis with lower efficiency (almost 2 orders of magnitude), while the efficiency of Mg2+, Mn2+, or Ba2+ was lower by almost 3 orders of magnitude. Our results demonstrate that mycelial Ca2+ homeostasis has powerful effects on the conidiation and mycelial morphogenesis in T. viride, and they suggest that there is an additional mechanism of conidiation in addition to those induced by light and starvation.

La présence de Ca2+ (jusqu’à 0,1 mol/L) dans les milieux de culture induit la formation de conidies chez les mycéliums submergés de Trichoderma viride et ce, de façon dépendante de la concentration. Le Ca2+ stimulait fortement la conidiation après 70 h de culture. L’effet était présent à la noirceur et l’éclairage ne le stimulait que marginalement. Des faibles concentrations de Ca2+ (moins de 100 µmol/L) induisaient la formation de chlamydospores. Le Sr2+ pouvait se substituer au Ca2+ dans la conidiogenèse avec une efficacité moins grande (presque 2 ordres de magnitude) alors que l’efficacité du Mg2+, du Mn2+ ou du Ba2+ était plus faible de presque 3 ordres de magnitude. Ces résultats démontrent que l’homéostasie de Ca2+ dans les mycéliums a des effets marqués sur la conidiation et la morphogenèse mycéliale chez T. viride et suggèrent qu’il existe un mécanisme additionnel de conidiation en plus de ceux induits par la lumière et la privation.

Document Type: Research Article

Publication date: April 1, 2008

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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