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Type: Journal article
Title: Cortical colonisation is not an absolute requirement for phosphorus transfer to plants in arbuscular mycorrhizas formed by Scutellospora calospora in a tomato mutant: evidence from physiology and gene expression
Author: Manjarrez Martinez, M.
Christophersen, H.
Smith, S.
Smith, F.
Citation: Functional Plant Biology, 2010; 37(12):1132-1142
Publisher: C S I R O Publishing
Issue Date: 2010
ISSN: 1445-4408
Statement of
Maria Manjarrez, Helle M. Christophersen, Sally E. Smith and F. Andrew Smith
Abstract: Arbuscules in Arum-type arbuscular mycorrhizas (AM), formed intracellularly in root cortical cells, are generally believed to be the most important and defining characteristics of the symbiosis as sites for phosphorus (P) and carbon (C) exchange. We used a Pen + Coi– phenotype (penetration of epidermal and exodermal root cells but not arbuscule formation) formed in rmc (reduced mycorrhizal colonisation) mutant tomato (Lycopersicon esculentum Mill.) by Scutellospora calospora (Nicol. & Gerd.) Walker & Sanders to determine whether the fungus is capable of transferring P from soil to plant and whether there is concurrent upregulation of AM-inducible orthophosphate (Pi) transporter gene expression in the roots. Our physiological data showed that colonisation of outer root cell layers is sufficient for P transfer from S. calospora to tomato. This transfer of P was supported by increased expression of the Pi transporter genes, LePT3 and LePT5, known to be upregulated in AM interactions. We conclude that cortical colonisation and formation of arbuscules or arbusculate hyphal coils is not an absolute prerequisite for P transfer in this symbiosis.
Keywords: Coi–mycorrhizal phenotype; mycorrhizal fungi; reduced mycorrhizal colonisation P transfer; Pi transporters.
Rights: © CSIRO 2010
RMID: 0020101538
DOI: 10.1071/FP09248
Appears in Collections:Agriculture, Food and Wine publications

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