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Expression Analysis of the First Arbuscular Mycorrhizal Fungi Aquaporin Described Reveals Concerted Gene Expression Between Salt-Stressed and Nonstressed Mycelium

September 2009 , Volume 22 , Number  9
Pages  1,169 - 1,178

Ricardo Aroca,1 Alberto Bago,1 Moira Sutka,2 José Antonio Paz,1 Custodia Cano,1 Gabriela Amodeo,2 and Juan Manuel Ruiz-Lozano1

1Departamento de Microbiología del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín, CSIC, Profesor Albareda, 1, 18008, Granada, Spain; 2Laboratorio de Biomembranas, Fisiología y Biofísica, Facultad de Medicina, Universidad de Buenos Aires, C1121ABG Buenos Aires, Argentina

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Accepted 22 May 2009.

Roots of most plants in nature are colonized by arbuscular mycorrhizal (AM) fungi. Among the beneficial effects of this symbiosis to the host plant is the transport of water by the AM mycelium from inaccessible soil water resources to host roots. Here, an aquaporin (water channel) gene from an AM fungus (Glomus intraradices), which was named GintAQP1, is reported for the first time. From experiments in different colonized host roots growing under several environmental conditions, it seems that GintAQP1 gene expression is regulated in a compensatory way regarding host root aquaporin expression. At the same time, from in vitro experiments, it was shown that a signaling communication between NaCl-treated mycelium and untreated mycelium took place in order to regulate gene expression of both GintAQP1 and host root aquaporins. This communication could be involved in the transport of water from osmotically favorable growing mycelium or host roots to salt-stressed tissues.

© 2009 The American Phytopathological Society