Phosphorus (P) efficiencies and mycorrhizal responsiveness of old and modern wheat cultivars

Phosphorus (P) efficiencies and mycorrhizal responsiveness of old and modern wheat cultivars A pot experiment was carried out in a growth chamber to investigate P efficiencies and mycorrhizal responsiveness of modern (Krichauff and Excalibur) and old (Khapstein, Bobin, Comeback and Purple Straw) wheat cultivars ( Triticum aestivum ). The arbuscular mycorrhizal fungus (AMF) used in this study was Glomus intraradices . The growth medium was a soil/sand mixture with NaHCO 3 -extractable P of 9.4 mg P kg −1 and no extra P was added. Plant P efficiencies (uptake, utilisation and agronomic) were found to differ significantly between cultivars, but no general trends of changes with the year of release of the cultivar were found. AMF colonisation was found to decrease plant growth under our experimental conditions with low light intensity. Mycorrhizal responsiveness (MR) was measured in terms of the improvement in plant P nutrition (shoot P concentrations). MR was found to be generally lower in modern cultivars than in old cultivars, indicating that modern breeding programs may have reduced the responsiveness of modern wheat cultivars to arbuscular mycorrhizal fungi. MR was also found to decrease in general with increased plant P utilisation efficiency. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant and Soil Springer Journals

Phosphorus (P) efficiencies and mycorrhizal responsiveness of old and modern wheat cultivars

Plant and Soil, Volume 237 (2) – Dec 1, 2001

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Publisher
Springer Journals
Copyright
Copyright © 2001 by Kluwer Academic Publishers
Subject
Environment; Ecology; Plant Sciences; Plant Physiology; Soil Science & Conservation
ISSN
0032-079X
eISSN
1573-5036
D.O.I.
10.1023/A:1013343811110
Publisher site
See Article on Publisher Site

Abstract

A pot experiment was carried out in a growth chamber to investigate P efficiencies and mycorrhizal responsiveness of modern (Krichauff and Excalibur) and old (Khapstein, Bobin, Comeback and Purple Straw) wheat cultivars ( Triticum aestivum ). The arbuscular mycorrhizal fungus (AMF) used in this study was Glomus intraradices . The growth medium was a soil/sand mixture with NaHCO 3 -extractable P of 9.4 mg P kg −1 and no extra P was added. Plant P efficiencies (uptake, utilisation and agronomic) were found to differ significantly between cultivars, but no general trends of changes with the year of release of the cultivar were found. AMF colonisation was found to decrease plant growth under our experimental conditions with low light intensity. Mycorrhizal responsiveness (MR) was measured in terms of the improvement in plant P nutrition (shoot P concentrations). MR was found to be generally lower in modern cultivars than in old cultivars, indicating that modern breeding programs may have reduced the responsiveness of modern wheat cultivars to arbuscular mycorrhizal fungi. MR was also found to decrease in general with increased plant P utilisation efficiency.

Journal

Plant and SoilSpringer Journals

Published: Dec 1, 2001

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