Record ID No. |
595 |
Author(s) |
Cavagnaro, T.R., Smith, F.A., Smith, S.E., Jakobsen, I , 2005 |
Affiliation |
University of California Davis, Department of Land Air & Water Resources, 1 Shields Ave, Davis, CA 95616 |
Title |
Functional diversity in arbuscular mycorrhizas: exploitation of soil patches with different phosphate enrichment differs among fungal species |
Source. Vol.(no):Page |
Plant cell and environment. 28(5): 642-650p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Physiology |
Sub-subjects |
Nutrition |
Host |
Linum usitatissimum |
Organism |
Glomus intraradices, G. mosseae , Gigaspora margarita |
Country |
U.S.A, North America |
Abstracts |
Most terrestrial plant species form associations with arbuscular mycorrhizal fungi (AMF) that transfer soil P to the plant via their external hyphae. The distribution of nutrients in soils is typically patchy (heterogeneous) but little is known about the ability of AMF to exploit P patches in soil. This was studied by growing symbioses of Linum usitatissimum and three AMF (Glomus intraradices, G. mosseae and Gigaspora margarita) in pots with two side-arms, which were accessible to hyphae, but not to roots. Soil in one side-arm was either unamended (P0) or enriched with P; simultaneous labelling of this soil with P-32 revealed that G. intraradices responded to P enrichment both in terms of hyphal proliferation and P uptake, whereas the other AMF did not. Labelling with P-33 of P0 soil in the other side arm revealed that the increased P uptake by G. intraradices from the P-enriched patch was paralleled by decreased P uptake by other parts of the mycelium. This is the first demonstration of variation in growth and nutrient uptake by an AMF as influenced by a localized P enrichment of the soil. The results are discussed in the context of functional diversity of AMF. |