Acquisition of Cu, Zn, Mn and Fe by mycorrhizal maize (Zea mays L.) grown in soil at different P and micronutrient levels |
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Authors: | A Liu C Hamel R I Hamilton B L Ma D L Smith |
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Institution: | (1) Department of Natural Resource Sciences, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec, H9X 3V9, Canada Tel.: +1-514-398-7759 Fax: +1-514-398-7990 e-mail: hamel@nrs.mcgill.ca, CA;(2) Central Experimental Farm, Agriculture Canada, Ottawa, K1A 0C6, Canada, CA;(3) Department of Plant Science, McGill University, 21111 Lakeshore Road, Ste-Anne-de-Bellevue, Quebec, H9X 3V9, Canada, CA |
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Abstract: | Sustainability of soil-plant systems requires, among other things, good development and function of mycorrhizal symbioses.
The effects of P and micronutrient levels on development of an arbuscular mycorrhizal fungus (AMF) and uptake of Zn, Cu, Mn
and Fe by maize (Zea
mays L.) were studied. A pot experiment with maize either inoculated or not with Glomus intraradices was conducted in a sand:soil (3 :1) mix (pH 6.5) in a greenhouse. Our goal was to evaluate the contribution of mycorrhizae
to uptake of Cu, Zn, Mn and Fe by maize as influenced by soil P and micronutrient levels. Two levels of P (10 and 40 mg kg−1 soil) and three levels of a micronutrient mixture: 0, 1X and 2X (1X contained, in mg kg−1 soil, 4.2 Fe, 1.2 Mn, 0.24 Zn, 0.06 Cu, 0.78 B and 0.036 Mo), were applied to pots. There were more extraradical hyphae at
the low P level than at the high P level when no micronutrients were added to the soil. Root inoculation with mycorrhiza and
application of micronutrients increased shoot biomass. Total Zn content in shoots was higher in mycorrhizal than non-mycorrhizal
plants grown in soils with low P and low or no micronutrient addition. Total Cu content in shoots was increased by mycorrhizal
colonization when no micronutrients were added. Mycorrhizal plants had lower Mn contents than non-mycorrhizal plants only
at the highest soil micronutrient level. AMF increased total shoot Fe content when no micronutrients were added, but decreased
shoot Fe when plants were grown at the high level of micronutrient addition. The effects of G. intraradices on Zn, Cu, Mn, and Fe uptake varied with micronutrient and P levels added to soil.
Accepted: 27 December 1999 |
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Keywords: | Extraradical hyphae Micronutrients Nutrient uptake Root colonization |
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