Arbuscular mycorrhizal fungi contribute to phosphorus uptake by wheat grown in a phosphorus-fixing soil even in the absence of positive growth responses

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dc.contributor.authorLi, H.
dc.contributor.authorSmith, S.
dc.contributor.authorHolloway, R.
dc.contributor.authorZhu, Y.
dc.contributor.authorSmith, F.
dc.date.issued2006
dc.descriptionThe definitive version is available at www.blackwell-synergy.com
dc.description.abstractWe used 32P to quantify the contribution of an arbuscular mycorrhizal (AM) fungus (Glomus intraradices) to phosphorus (P) uptake by wheat (Triticum aestivum), grown in compartmented pots. The soil was from a major cereal-growing area, the Eyre Peninsula, South Australia; it was highly calcareous and P-fixing. Fertilizer P was added to soil at 20 mg kg(-1), as solid or liquid. Two extraction methods were used to estimate plant-available P. Fungal colonization was well established at harvest (36 d). Application of P decreased both colonization and hyphal length density in soil, with small differences between different P fertilizers. Plants showed large positive responses in terms of growth or total P uptake to all P additions, and showed no positive (or even negative) responses to AM colonization, regardless of P application. 32P was detected only in AM plants, and we calculated that over 50% of P uptake by plants was absorbed via AM fungi, even when P was added. The results add to the growing body of knowledge that 'nonresponsive' AM plants have a functional AM pathway for P transfer to the plant; it should not be ignored in breeding plants for root traits designed to improve P uptake.
dc.description.statementofresponsibilityHuiying Li, Sally E. Smith, Robert E. Holloway, Yongguan Zhu, F. Andrew Smith
dc.identifier.citationNew Phytologist, 2006; 172(3):536-543
dc.identifier.doi10.1111/j.1469-8137.2006.01846.x
dc.identifier.issn0028-646X
dc.identifier.issn1469-8137
dc.identifier.urihttp://hdl.handle.net/2440/23769
dc.language.isoen
dc.publisherBlackwell Publishing Ltd
dc.source.urihttp://www.blackwell-synergy.com/doi/abs/10.1111/j.1469-8137.2006.01846.x
dc.subjectmycorrhizal responsiveness
dc.subjectphosphorus (P)-fixing soil
dc.subjectP-32 uptake
dc.subjectsoil P-extraction
dc.titleArbuscular mycorrhizal fungi contribute to phosphorus uptake by wheat grown in a phosphorus-fixing soil even in the absence of positive growth responses
dc.typeJournal article
pubs.publication-statusPublished

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