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Pre-symbiotic Interactions Between the Desert Truffle Terfezia boudieri and Its Host Plant Helianthemum sessiliflorum

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Desert Truffles

Part of the book series: Soil Biology ((SOILBIOL,volume 38))

Abstract

Each of the two members of the mycorrhizal couple, the plant and the fungus, has developed mechanisms for signaling the other prior to the actual formation of the mycorrhizal association. The symbiotic pair Terfezia boudieri (Pezizaceae, a desert truffle) and Helianthemum sessiliflorum (Cistaceae) was studied with a view to determining how fungal secretion of auxin—a plant hormone—promotes establishment of mycorrhizas, on the one hand, and how plant chemoattractants affect fungal growth, on the other. In view of the known effects of auxin—inhibition of tap root growth, enhancement of secondary root development, bending of the direction of root growth towards the horizontal (negative chemotropism)—it seems that auxin secretion by the fungus is designed to keep the root tips (which are the fungal penetration sites) within its reach. Indeed, fungi grow about ten times more slowly than developing roots. Inhibition of root hair formation, another effect of fungal auxin, makes the plant dependent on the fungus for its nutrients. It is known that fungal oriented growth towards plant roots is very pronounced under limiting sugar availability and much weaker under high sugar concentrations. Our research has recently focused on isolation of potential plant chemoattractants; so far, one as yet unidentified compound with a molecular weight of about 535 has been found to possess chemotropic activity.

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Author information

Authors and Affiliations

  1. The Jacob Blaustein Institute for Desert Research, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel

    Yaron Sitrit & Tidhar Turgeman

  2. Department of Life Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 84105, Israel

    Nurit Roth-Bejerano & Varda Kagan-Zur

Authors
  1. Yaron Sitrit
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  2. Nurit Roth-Bejerano
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  3. Varda Kagan-Zur
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  4. Tidhar Turgeman
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Corresponding author

Correspondence to Yaron Sitrit .

Editor information

Editors and Affiliations

  1. Life Sciences Department, Ben-Gurion University, Beer-Sheva, Israel

    Varda Kagan-Zur

  2. Life Sciences Department, Ben-Gurion University, Beer-Sheva, Israel

    Nurit Roth-Bejerano

  3. Jacob Blaustein Institute for Desert Research, Ben-Gurion University, Beer-Sheva, Israel

    Yaron Sitrit

  4. Facultad de Biología, Universidad de Murcia, Murcia, Spain

    Asunción Morte

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Sitrit, Y., Roth-Bejerano, N., Kagan-Zur, V., Turgeman, T. (2014). Pre-symbiotic Interactions Between the Desert Truffle Terfezia boudieri and Its Host Plant Helianthemum sessiliflorum . In: Kagan-Zur, V., Roth-Bejerano, N., Sitrit, Y., Morte, A. (eds) Desert Truffles. Soil Biology, vol 38. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-40096-4_6

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