Abstract
The scarce occurrence along with over-exploitation of Abroma augusta vis-a-vis its usage by practitioners of traditional medicinal system has augmented its importance among researchers and conservation biologists. The present study was an attempt to examine the alterations induced by abiotic environmental (i.e. climatic, biotic and physiographic) factors related to the plant habitat on the Arbuscular Mycorrhizal (AM) fungal partners of the target plant. Rhizospheric soils collected from 24 study sites of eight natural locations under six habitats from the Brahmaputra valley, Assam, India were assessed for AM populations. Through this study, a total of 22 AM fungal species under three genera (i.e. Glomus, Gigaspora and Acaulospora) were isolated. Riverine habitat augments AM spore density (155±1.19) while fallows are characterized by maximum colonization by hyphae (80±0.45) and arbuscules (10±0.18). It is evident that increase in soil temperature and electrical conductivity, exhibited declining effect on the percent root colonization, AM spore numbers per 50 g of soil as well as AM ecological indices. The association between rhizospheric fungal biota including endomycorrhizae and abiotic soil properties can be exclusively advocated for a broader utilization as an ecological indicator for the conservation of target plant species which is discussed in this research paper.
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