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- Title
Host plant stimulates hypaphorine accumulation in <em>Pisolithus tinctorius</em> hyphae during ectomycorrhizal infection while excreted fungal hypaphorine controls root hair development.
- Authors
Béguiristain, Thierry; Frédéric Lapeyrie, Thierry
- Abstract
The hypaphorine concentration in <em>Pisolithus tinctorius</em> Coker & Couch hyphae colonizing <em>Eucalyptus</em> roots was 3 to 5 times higher than in adjacent parts of the fungal colony. This phenomenon, observed 24 h after inoculation, was also recorded in several-month-old, well-established ectomycorrhizas. Accumulation was controlled by specific root-derived diffusible molecules, it can be induced through a membrane, but not by non-host plants. In pure culture, high hypaphorine concentration was found only in the youngest mycelium, i.e. the outer 2 mm of the colony. Fungal hypaphorine had no IAA-like activity on Eucalyptus root development and therefore could not he considered as an auxin analogue; instead, a strong reduction of root hair elongation was recorded.
- Subjects
EUCALYPTUS; PLANT roots; ECTOMYCORRHIZAS; PLANTS; PLANT hormones; AUXIN; HYPAPHORINE
- Publication
New Phytologist, 1997, Vol 136, Issue 3, p525
- ISSN
0028-646X
- Publication type
Article
- DOI
10.1046/j.1469-8137.1997.00753.x