PJB-2018-88
Relationships between mycorrhizas and root hairs
YING-NING ZOU
Abstract
Mycorrhizal extraradical hyphae and root hairs coexist in the root surface to be responsible for water and nutrient absorption from soils. Root hairs generally are a preferential adhesion point colonized by ectomycorrhizal hyphae, and eventually are suppressed or incorporated in the fungal mantle. However, arbuscular mycorrhizal (AM) fungi occasionally penetrate root hairs of host plants. A root hair feature is not a reliable indicator of mycorrhizal dependency, as well a mycorrhizal growth response. Mycorrhizal fungal inoculation has the increased and reduced effects on root-hair growth, which is related mainly with auxin and some potential factors (i.e. P and glucose). Root hairs have the preponderant role in soil adhesion under sand or semi-arid conditions, in comparison with extraradical hyphae. In addition, root hairs have higher effectiveness in P acquisition and utilization in biomass production than extraradical hyphae under P-deficient conditions. Under drought stress, AM fungi almost replace the absence of root hairs to enhance plant tolerance through alternative pathways.
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