Hudsonia ericoides and Hudsonia tomentosa: Anatomy of mycorrhizas of two members in the Cistaceae from Eastern Canada

Massicotte, Hugues B.; Peterson, R. Larry; Melville, Lewis H.; Tackaberry, Linda E.
June 2010
Botany;Jun2010, Vol. 88 Issue 6, p607
Academic Journal
Most species in the family Cistaceae are found in the Mediterranean basin. Several hosts are of special interest, owing to their associations with truffle species, while many are important as pioneer plants in disturbed areas and in soil stabilization. For these reasons, understanding their root systems and their associated fungal symbionts is important. Most studies of the structure of mycorrhizas in this family involve two genera, Cistus and Helianthemum. The present study examines structural features of mycorrhizas in two North American species, Hudsonia ericoides L. and Hudsonia tomentosa Nutt. Root systems of both species are highly branched with most fine roots colonized by mycorrhizal fungi. Based on morphological features, several mycorrhizal fungi were identified; structural details also provided evidence of more than one fungal symbiont for each host species. All mycorrhizas had a multi-layered fungal mantle and Hartig net hyphae confined to radially elongated epidermal cells; no intracellular hyphae were observed. Although the Hartig net was confined to the epidermis, the outer row of cortical cell walls lacked suberin, a known barrier to fungal penetration. Mycorrhizas in H. ericoides and H. tomentosa differed from those of Cistus and Helianthemum species that have a Hartig net that extends into the root cortex, as well as frequently present intracellular hyphae. La plupart des espèces de la famille des Cistaceae se retrouvent dans le bassin de la Méditerranée. Plusieurs hôtes présentent un intérêt particulier, compte tenu de leurs associations avec des espèces de truffes, alors que d'autres constituent des plantes pionnières importantes dans les endroits perturbés et pour la stabilisation des sols. Pour ces raisons, il importe de comprendre la biologie de leurs systèmes racinaires et de leurs champignons symbiotiques associés. La plupart des études publiées sur la structure des mycorhizes de cette famille portent sur les deux genres Cistus et Helianthemum. On examine ici les caractéristiques structurales des mycorhizes de deux espèces Nord-américaines, l'Hudsonia ericoides L. et l'Hudsonia tomentosa Nutt. Chez les deux espèces, l'on observe des systèmes racinaires fortement ramifiés, la plupart des racines fines étant colonisées par des champignons mycorhiziens. Sur la base des caractéristiques morphologiques, les auteurs ont pu identifier plusieurs espèces de champignons mycorhiziens; les détails des structures fournissent également des preuves de l'existence de plus d'un symbiote fongique chez chaque espèce hôte. Toutes les mycorhizes montrent un manteau fongique à plusieurs couches et des hyphes du réseau de Hartig confinées aux cellules épidermiques radialement allongées; on observe aucune pénétration intracellulaire. Bien que le réseau de Hartig soit confiné à l'épiderme, les parois cellulaires de la couche externe de cellules corticales ne possèdent pas de subérine, une barrière reconnue pour la pénétration fongique. Les mycorhizes chez les H. ericoides et H. tomentosa diffèrent de celles des espèces de Cistus et d'Helianthemum, lesquelles possèdent un réseau de Hartig s'étendant dans le cortex racinaire et montrent la présence d'hyphes intracellulaires souvent présentes.


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