Mycorrhizal dependency of some endemic and endangered Hawaiian plant species
Date of Original Version
Four endemic species of Hawaiian plants were tested for their response to inoculation with a Hawaiian isolate of Glomus aggregatum (an arbuscular mycorrhizal fungus [AMF]) when grown in a native soil with or without P added to achieve different soil-solution P levels. The endangered species (Sesbania tomentosa [Fabaceae] and Colubrina oppositifolia [Rhamnaceae]) and two nonendangered species (Bidens sandvicensis and B. asymmetrica × sandvicensis [Asteraceae]) were tested. When soil-solution P levels in greenhouse trials were similar to unfertilized field soils (e.g., 0.005-0.020 mg P/L), shoots of inoculated plants were 2.1 to 7.0 times larger than noninoculated plants. Leaf tissue P levels and root biomass in these species showed similar responses to inoculation. Mycorrhizal dependencies ranging from 44 to 88% were measured when plants were grown in low-P soils and were -4-42% in soil with P levels typical of highly productive agricultural soils. A survey of P levels in a variety of native (nonagricultural) Hawaiian soils indicated the widespread occurrence of P-limited sites (mean = 0.010 mg P/L, range = <0.001-0.030 mg P/L; N = 41). The terms "ecological mycorrhizal dependency" (EMD) and "agricultural mycorrhizal dependency" (AMD) are introduced to refine the concept of mycorrhizal dependency.
American Journal of Botany
Gemma, J. N., R. E. Koske, and M. Habte. "Mycorrhizal dependency of some endemic and endangered Hawaiian plant species." American Journal of Botany 89, 2 (2002): 337-345. doi:10.3732/ajb.89.2.337.