Arbuscular mycorrhizal fungi in the rhizosphere of Macaranga denticulata Muell. Arg., and their effect on the host plant |
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Authors: | Somchit Youpensuk Saisamorm Lumyong Bernie Dell Benjavan Rerkasem |
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Institution: | (1) Department of Biology, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand;(2) School of Biological Sciences and Biotechnology, Murdoch University, Perth, 6150, Australia;(3) Department of Agronomy, Faculty of Agriculture, Chiang Mai University, Chiang Mai, 50200, Thailand |
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Abstract: | A fallow enriching tree, Macaranga denticulata Muell. Arg., has been shown to increase rice yield in a rotational shifting cultivation system in northern Thailand through
increased accumulation of mineral nutrients. As arbuscular mycorrhizal (AM) fungi may play an important role in nutrient accumulation,
AM fungi in the rhizosphere of M. denticulata and the effects of the indigenous soil inoculum on the host plant were investigated. The diversity and abundance of AM fungi
were documented for the rhizosphere of M. denticulata in the field for two years. Based on morphology, 29 species of AM fungi were found in the rhizosphere of M. denticulata growing in farmers’ fields. Root colonization ranged from 63.5 to 81.5% in the first year and 68.7 to 79.9% in the second
year of study. The highest spore density was observed at the end of the wet season. The effects of indigenous soil inoculum,
and N and P fertilizers on the host plant were investigated in pots for four months. Inoculation with soil-containing AM fungi
strongly increased plant growth and nutrient contents when P was limiting but N was applied. Application of N and P together
strongly depressed root colonization and spore density of AM fungi, whereas applying them separately had much less effect.
AM fungi may play an important role in nutrient accumulation in M. denticulata-rich fallow and thus in nutrient cycling that is beneficial to the maintenance of upland rice yield and sustainability of
the rotational shifting cultivation system.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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Keywords: | Fallow enriching tree Nitrogen Phosphorus Rotational shifting cultivation Upland rice |
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