Abstract
Arbuscular mycorrhizal (AM) fungi on Japanese semi-natural grasslands were investigated at three adjacent sites with different vegetation. The predominant grasses at the three sites were 1)Pleioblastus chino, 2)Miscanthus sinensis andArundinella hirta (M. sinensis/A. hirta), and 3)Zoysia japonica, respectively. The degree of colonization was higher inM. sinensis/A. hirta than inP. chino andZ. japonica. AM fungi were recovered by spore extraction and by pot cultures started from soil inoculum or from transplanting of field plants. Total spore number obtained by the spore extraction method was highest in the rhizosphere ofM. sinensis/A. hirta and lowest in that ofP. chino. AGlomus sp. resemblingG. geosporum predominated in association withM. sinensis/A. hirta andP. chino. FromZ. japonica, three species,Acaulospora gerdemannii, Glomus leptotichum, and a species resemblingG. clarum, were isolated by pot culture from soil and two species,A. longula andScutellospora cerradensis, by pot culture from transplanting ofZ. japonica. FromM. sinensis/A. hirta, one species,A. longula, was found by pot culture from soil. FromP. chino, no AM fungus was detected by either method. Single-spore culture confirmed thatG. leptotichum andA. gerdemannii are conspecific.
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