Journal
NEW FORESTS
Volume 40, Issue 1, Pages 101-118Publisher
SPRINGER
DOI: 10.1007/s11056-009-9186-z
Keywords
Actinorhizal; AM fungi; Casuarina equisetifolia; Frankia; Nodulation; Seedling quality
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We investigated the role of tetrapartite associations between an arbuscular mycorrhizal (AM) fungus (Glomus geosporum), phosphate solubilizing bacteria (Paenibacillus polymyxa), Frankia and Casuarina equisetifolia on growth, nutrient acquisition, nutrient utilization and seedling quality of C. equisetifolia. Seedlings of C. equisetifolia were grown in an Alfisol soil and inoculated with G. geosporum, P. polymyxa and Frankia either individually or in combinations. Inoculation of bioinoculants stimulated seedling growth, the efficiency of nutrient uptake and improved seedling quality. However, microbial inoculation generally reduced the efficiency of nutrient utilization in dry matter production (nutrient use efficiency). Inoculation of P. polymyxa or Frankia increased the extent of AM colonization, which resulted in the accumulation of the nutrients. Seedlings inoculated with Frankia and G. geosporum had more, and heavier nodules compared to seedlings inoculated with Frankia alone. Dual inoculation of microbes was more effective than individual inoculations. The growth response of seedlings to inoculation involving all the microbes was greater than the response to either individual or dual inoculations. The results of this study showed that the tetrapartite association could improve the growth, nutrient acquisition and seedling quality of C. equisetifolia under tropical nursery conditions.
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