2. STUDY OF BENEFICIAL MICROORGANISMS IN THE RHIZOSPHERE SOILS OF MYRICA ESCULENTA (BUCH.-HAM. EX D. DON.) by ANITA KACHARI1, P. HAZARIKA2 AND D. DUTTA2
A study was done to explore the beneficial microorganisms in rhizosphere soils of Myrica esculenta (Buch.-Ham. ex D. Don) during 2016-2017 at RFRI, Jorhat. Ten triplicate samples from ten different villages of Jorhat, Golaghat, and Sivasagar districts, Assam were collected from rhizosphere soils of Myrica esculenta and beneficial microorganisms were cultured, isolated and identified. The study revealed that the plant species has arbuscular mycorrhizal fungi (AMF) association in roots. Average percent root colonization of AMF of the plant species was recorded for 57.2 with a range of 40 to 66 per cent. The variation recorded may be due to difference in locality of sample collections. AMF spores were isolated from rhizosphere soils and identified tentatively up to the genus. Twenty five (25) types of AMF spores were isolated from Myrica esculenta rhizosphere soils belongs to nine (9) genus of 6 families of Glomeromycota i.e. Glomus, Acaulospora, Diversispora, Steptoglomus, Funneliformis, Rhizophagus, Entrophospora, Scutellospora and Gigaspora. Apart from arbuscular mycorrhizal fungi, from the rhizosphere soils of the plant species isolated phosphate solubilizing micro-organism (PSM) and plant growth promoting rhizobacteria (PGPR), which have been reported as useful for sustaining soil health and plant survival. Some such beneficial bacteria i.e. Flouresent Pseudomonas and Bacillus spp were isolated from rhizophere soils of Myrica esculenta and cultured them in media and identified. Some phytostimulator, PSM and decomposer microfungi such as Penicilliun, Aspergillus, Curvularia, Mucor etc were also isolated from rhizophere soils of the plant species.
KEYWORDS: Rhizosphere soil, beneficial microorganisms, Arbuscular mycorrhiza, PGPR, PSM.