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https://hdl.handle.net/2440/23769
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Type: | Journal article |
Title: | Arbuscular mycorrhizal fungi contribute to phosphorus uptake by wheat grown in a phosphorus-fixing soil even in the absence of positive growth responses |
Author: | Li, H. Smith, S. Holloway, R. Zhu, Y. Smith, F. |
Citation: | New Phytologist, 2006; 172(3):536-543 |
Publisher: | Blackwell Publishing Ltd |
Issue Date: | 2006 |
ISSN: | 0028-646X 1469-8137 |
Statement of Responsibility: | Huiying Li, Sally E. Smith, Robert E. Holloway, Yongguan Zhu, F. Andrew Smith |
Abstract: | We 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. |
Keywords: | mycorrhizal responsiveness phosphorus (P)-fixing soil P-32 uptake soil P-extraction |
Description: | The definitive version is available at www.blackwell-synergy.com |
DOI: | 10.1111/j.1469-8137.2006.01846.x |
Published version: | http://www.blackwell-synergy.com/doi/abs/10.1111/j.1469-8137.2006.01846.x |
Appears in Collections: | Aurora harvest 2 Earth and Environmental Sciences publications |
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