| Autor: |
Li H; Centre for Soil-Plant Interactions, Soil and Land Systems, School of Earth and Environmental Sciences, Waite Campus, DP636, The University of Adelaide, South Australia, 5005, Australia. h.li@adelaide.edu.au, Smith SE, Holloway RE, Zhu Y, Smith FA |
| Jazyk: |
angličtina |
| Zdroj: |
The New phytologist [New Phytol] 2006; Vol. 172 (3), pp. 536-43. |
| DOI: |
10.1111/j.1469-8137.2006.01846.x |
| Abstrakt: |
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. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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