PJB-2019-86
Relationships between mycorrhizae and root hairs
Ying-Ning Zou, De-Jian Zhang, Chun-Yan Liu and Qiang-Sheng Wu
Abstract
Mycorrhizal extraradical hyphae and root hairs coexist on the root surface and are responsible for water and nutrient absorption from the soil. 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 in plants, as well a mycorrhizal growth response. AM fungal inoculation has increased and reduced effects on root-hair growth (including length, density, and diameter), which is related mainly with auxin and some potential factors (i.e. P and glucose). Such AM effects on root hair can be regulated by substrate P and soil water levels. 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.
To Cite this article:
Zou, Y.N., D.J. Zhang, C.Y. Liu and Q.S. Wu. 2019. Relationships between mycorrhizae and root hairs. Pak. J. Bot., 51(2): DOI: http://dx.doi.org/10.30848/PJB2019-2(39)
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