Root Infection and Population Density of VA Mycorrhizal Fungi in a Coconut Based Multistoreyed Cropping System
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1982
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Abstract
Spores of vesicular-arbuscular (VA) mycorrhizal fungi were found in all the soil samples collected from the root zones of plants forming a coconut-based multistoreyed cropping system, namely coconut, cacao, cinnamon and black pepper. Their numbers ranged widely from plant to plant (8-420 spores/100 g soil) and varied remarkably from sample to sample of the same crop. Of the eight species found, Gigaspora gigan-tea, G. gilmorei, Glomus fasciculatus (clusters), and G. macrocarpa were most common, G. microcarpa and a flat unidentified spore type were less frequent, whereas Sclerocystis sp. and a white unidentified spore type ' were rare. Usually more than two VA species occurred at the root zone of each crop. Root samples of all the hosts showed extensive infection (80-98%) with internal and external hyphae, and characteristic vesicles and arbuscules.
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Placrosym V, 1982, p.548-554