Ability to Tolerate Acidity, Resist and Absorb Aluminum of Fungi Isolated from Tea Soils in Tan Cuong, Thai Nguyen, Vietnam

Abstract

Abstract: From tea soils in Tan Cuong (Thai Nguyen, Vietnam), 16 acid- tolerant and aluminum- resistant fungi were isolated on Hansen plates (pH 3.0) with 100 mgL^-1 Al. Two strains (F8 and F13) could grow wellon Hansen plates (pH 3.0) with 700 mgL^-1 Al. Morphological and 28S rDNA sequence analyses indicated that strain F8 belonged to Eupenicillium javanicum, while strain F13 belonged to Penicillium variabile. Further investigation showed that both strains could grow actively in Hansen broth with 100 mgL^-1 Al at pH 2.2- 5.0 and with 500- 2,000 mgL^-1 Al at pH 2.4. After 7 days of incubation on a shaker at 30^oC, 150 rpm, the aluminium absorption efficiency from Hansen broth with 2000 mgL^-1 Al (pH 2.4) of strain F8 was 92.06% and that of strain F13 was 86.88%. The fungi areconsidered to be useful not only to improve acidified soils by decreasing the ionic aluminum concentration but also ensure quality of tea product.

Keywords: Acid soil, tea soil, acid-tolerant fungi, aluminum-resistant fungi, aluminium absorption.

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