TY - JOUR
T1 - Phosphatase activities of arbuscular mycorrhizal intraradical and extraradical mycelium, and their relation to phosphorus availability
AU - Van Aarle, Ingrid M.
AU - Rouhier, Hervé
AU - Saito, Masanori
N1 - Funding Information:
The financial support of the Swedish Council for Forestry and Agricultural Research, the Sweden–Japan Foundation and the Royal Physiographic Society in Lund is gratefully acknowledged. This work has also, in part, been supported by the Promotion of Basic Research Activities for Innovation of Biosciences (PROBRAIN), Bio-oriented Technology Research Advances Institution, Japan. The initial work was performed at the National Institute of Livestock and Grassland Science (Nishinasuno) and the Faculty of Medicine, Chemistry Laboratory, Teikyo University (Tokyo). We wish to thank Pål Axel Olsson for critical reading of the manuscript. I.v.A. is indebted to the research and technical members of the Laboratory of Soil Ecology (National Institute of Livestock and Grassland Science, Japan).
PY - 2002/10/1
Y1 - 2002/10/1
N2 - We investigated the influence of changes in external phosphorus (P) concentration on the proportion of phosphatase-active structures of the arbuscular mycorrhizal fungus Gigaspora margarita associated with Allium cepa. The P treatment was started when mycorrhizal colonisation had been established, and plant systems were harvested three times after the start of the P treatment. Higher shoot dry weights and P contents were observed in the high-P treated plants at the last harvest. We did not find any change in the proportion of phosphatase-active extraradical mycelium following P treatment. However, the proportion of alkaline phosphatase-active mycelium was positively correlated for extraradical and intraradical mycelium. Also, the proportion of alkaline phosphatase-active arbuscules seemed to increase with the shoot fresh weight, whereas the proportion of acid phosphatase-active arbuscules decreased with higher shoot P concentration and dry weight. We have shown experimentally that the intraradical mycelium of G. margarita, but not the extraradical mycelium, responds metabolically to plant P concentration, and possibly also to external P availability.
AB - We investigated the influence of changes in external phosphorus (P) concentration on the proportion of phosphatase-active structures of the arbuscular mycorrhizal fungus Gigaspora margarita associated with Allium cepa. The P treatment was started when mycorrhizal colonisation had been established, and plant systems were harvested three times after the start of the P treatment. Higher shoot dry weights and P contents were observed in the high-P treated plants at the last harvest. We did not find any change in the proportion of phosphatase-active extraradical mycelium following P treatment. However, the proportion of alkaline phosphatase-active mycelium was positively correlated for extraradical and intraradical mycelium. Also, the proportion of alkaline phosphatase-active arbuscules seemed to increase with the shoot fresh weight, whereas the proportion of acid phosphatase-active arbuscules decreased with higher shoot P concentration and dry weight. We have shown experimentally that the intraradical mycelium of G. margarita, but not the extraradical mycelium, responds metabolically to plant P concentration, and possibly also to external P availability.
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U2 - 10.1017/S0953756202006470
DO - 10.1017/S0953756202006470
M3 - Article
AN - SCOPUS:0036818358
VL - 106
SP - 1224
EP - 1229
JO - Mycological Research
JF - Mycological Research
SN - 1878-6146
IS - 10
ER -