Mycorrhizal responses of barley cultivars differing in P efficiency |
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Authors: | J B Baon S E Smith A M Alston |
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Institution: | (1) Department of Soil Science, Waite Agricultural Research Institute, The University of Adelaide, 5064 Glen Osmond, SA, Australia |
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Abstract: | The purpose of this study was to investigate how barley cultivars which are different in dry matter yield at low phosphorus
(P) supply (i.e. they differ in agronomic P efficiency) respond to mycorrhizal infection. In a preliminary experiment, six
mycorrhizal fungi were tested for their ability to colonize barley (Hordeum vulgare L.) roots at a soil temperature of 15°C.Glomus etunicatum was the most effective species and was used in the main experiment. The main experiment was conducted under glasshouse conditions
in which soil temperature was maintained at 15°C. Treatments consisted of a factorial arrangement of 8 barley cultivars, 2
mycorrhiza (inoculated and non-inoculated), and 3 rates of P (0, 10 and 20 mg kg-1). P utilization efficiency (dry matter yield per unit of P taken up) and agronomic P efficiency among the barley cultivars
was significantly negatively correlated with mycorrhizal responses. However, the response to mycorrhizal infection was positively
correlated with response to P application. Poor correlation was observed between P concentration when neither mycorrhiza nor
P were supplied and the percentage of root length infected. The extent of mycorrhizal infection among the barley cultivars
in soil without P amendment varied from 8.6 to 28.6%. Significant interactions between cultivar and P addition, and between
mycorrhiza and P addition were observed for shoot dry weight but not root dry weight. |
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Keywords: | barley cultivars efficiency Glomus etunicatum Hordeum vulgare low temperature phosphorus response VA mycorrhiza |
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