Record ID No. |
66 |
Author(s) |
Li H.Y., Smith S.E., Holloway R.E., Zhu Y.G. , Smith F.A. , 2006 |
Affiliation |
University of Adelaide, School of Earth & Environmental Sciences, Central Soil Plant Interact Soil & Land System, Waite Campus,DP636, Adelaide, SA 5005, Australia, Email: h.li@adelaide.edu.au |
Title |
Arbuscular mycorrhizal fungi contribute to phosphorus uptake by wheat grown in a phosphorus-fixing soil even in the absence of positive growth responses |
Source. Vol.(no):Page |
New phytologist. 172(3):536-543p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Fungal evaluation |
Host |
Triticum aestivum |
Organism |
Glomus intraradices |
Country |
Australia |
Abstracts |
We used P-32 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. P-32 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 |