Open AccessPlants as resource islands and storage units – adopting the mycocentric view of arbuscular mycorrhizal networks
Author(s) -
Lekberg Ylva,
Hammer Edith Caroline,
Olsson Pål Axel
Publication year - 2010
Publication title -
fems microbiology ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.377
H-Index - 155
eISSN - 1574-6941
pISSN - 0168-6496
DOI - 10.1111/j.1574-6941.2010.00956.x
Subject(s) - biology , hypha , herbaceous plant , symbiosis , colonization , arbuscular mycorrhizal , botany , nutrient , arbuscular mycorrhizal fungi , host (biology) , compartment (ship) , phosphorus , horticulture , ecology , bacteria , inoculation , oceanography , genetics , materials science , metallurgy , geology
The majority of herbaceous plants are connected by arbuscular mycorrhizal (AM) fungi in complex networks, but how this affects carbon (C) and phosphorus (P) allocation among symbionts is poorly understood. We utilized a monoxenic AM system where hyphae from donor roots colonized two younger receiver roots of varying C status. AM fungal C allocation from donor to receiver compartments was followed by measuring the 13 C contents in fungal‐ and plant‐specific lipids, and P movement from a hyphal compartment was traced using 33 P. Four times more 13 C was translocated from donor to C‐limited receiver roots, but C remained in fungal tissue. Root C status did not influence the overall AM colonization, but arbuscule density was twice as high in non‐C‐limited roots, and they received 10 times more 33 P. The number of hyphal connections between compartments did not influence C and P allocation. Interestingly, there were more fungal storage lipids, but fewer structural lipids inside C‐limited roots. Our results indicate that AM colonization may poorly reflect host quality as C can be supplied from neighboring roots. A mycocentric view of the symbiosis is proposed where C‐delivering hosts are resource islands for the exchange of P for C, and C‐limited hosts are storage units.