Development of vesicular-arbuscular mycorrhizal infection and the uptake of immobile nutrients inLeucaena leucocephala |
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Authors: | A Manjunath M Habte |
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Institution: | (1) Department of Agronomy and Soil Science, University of Hawaii, 96822 Honolulu, HI, USA |
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Abstract: | The level of vesicular-arbuscular mycorrhizal (VAM) infection in the roots of Leucaena grown in a sand-soil mixture in the
greenhouse increased rapidly with time and reached a peak value of 84% at 30 days from planting. The pattern of immobile nutrient
uptake and accumulation closely paralleled that of the development of infection, particularly during the first 10–30 days
after planting. Significant changes in dry matter yield were also observed only after a significant portion of the root length
was colonized byGlomus aggregatum. The development of VAM infection was not accompanied by growth depression at any of the sampling periods. However, VAM roots
had very high levels of Cu which was not translocated to shoots. It is hypothesized that such a diversion of Cu by the endophyte
from the host could cause growth depression under conditions where the soil volume is supplied with sub-optimal levels of
Cu.
Contribution from the Hawaii Institute of Tropical Agriculture and Human Resources Series No. 3186. |
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Keywords: | copper Glomus aggregatum immobile nutrients Leucaena leucocephala phosphorus Tropeptic Eutrustox vesicular-arbuscular mycorrhiza zinc |
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