Abstract
ABSTRACT Dendrobium ovatum is an epiphytic orchid endemic to the Western Ghats of India. Due to its valuable medicinal and therapeutic properties, the plant has become extensively sought after, leading to its classification as ‘threatened’ in the latest research findings. The present study aims to identify the surface-associated and endophytic bacterial associates of Dendrobium ovatum, which may be of great significance from a conservation standpoint. The investigation resulted in isolating and identifying 21 bacterial isolates representing six genera from the absorption roots, stem, and leaves. Bacillus was the most dominant genus, with seven representative species from root and stem segments. Enterobacter formed the second most dominant genus, with four representatives from leaf and stem. Bacillus cereus was found to be the most prevalent species, with a relative frequency of 28.57%. Root segments were found to be the most diverse tissue compared to stem and leaves. The study concluded that each tissue represents a unique ecological niche harbouring specific bacterial associate. The study also illuminates the intricacies of the orchids’ microbial community structure and forms the first documentation of bacterial associates of the threatened endemic orchid D. ovatum.
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