Journal of Taiwan Agricultural Research

Author:Su-Chen Lin* and Chi-Guang Wu

Abstract:

    This study was mainly conducted to explore the influence of phosphate on the spore germination and hyphal growth of six common arbuscular mycorrhizal fungi in Taiwan soil. The six tested mycorrhizal fungi included Acaulospora scrobiculata, A. morrowiae, Entrophospora kentinensis, Glomus mosseae, G. occultum, and G. versiforme. Among these species, the best condition for spore germination of E. kentinensis, and G. mosseae was achieved at the [PO₄^-3] 0.4~10 mM and their ranges of germination rate were 73.3~90.0% and 71.8~85.8% respectively. As the [PO₄^-3] increased to 20 Mm, the spore germination rates of both species declined to <20%. The spore germination was completely inhibited when [PO₄^-3] reached to 40 mM. Both A. morrowiae and A. scrobiculata showed better spore germination rate at the ranges of 44.3~58.5% and 49.7~63.8% respectively, when [PO₄^-3] was lower than 4 mM. The highest spore germination rate of G. versiforme was 45.5% at [PO₄^-3] 2 mM. G. occultum seemed very much sensitive to phosphorus, and could not tolerate more than [PO₄^-3] 1 mM. The hyphal length of E. kentinensis was only 0.3~0.5 mm/spore at [PO₄^-3] 0.4~10 mM. As the [PO₄^-3] reached to 20 mM, all of the spore germination was suppressed. The germination rate of G. mosseae was not affected at [PO₄^-3] 2 mM, but the length of hyphal growth decreased significantly. The hyphal growth of A. morrowiae, A. scrobiculata, and G. versiforme was significantly suppressed when [PO₄^-3] was higher than 10 mM. Both spore germination and hyphal growth of A. morrowiae and E. kentinensis were similar as found in potassium sulfate and potassium phosphate solutions. It was inferred that not only phosphate but also potassium ion might exert certain influence to these two species.

Key words:Mycorrhiza, Phosphorus, Potassium

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