Vol. 11, Issue 12 (2022)

Author(s):
Paramasivan M, S Muthuramu, L Rajendran and R Ramjegathesh

Abstract:
Plant growth promoting rhizobacteria (PGPR) is living to roots to give beneficial effect against soil borne pathogens and plant growth promotions, during survey of southern Tamil Nadu for major disease of groundnut and collection of PGPR under rainfed conditions during 2020-2021 survey southern district of Tamil Nadu. Groundnut root rot (24.35%) high at Chettinad, Stem rot (18.38%) at Sevur, late leaf spot (23.56%) and rust disease (32.42%) high in Sivagangai district comparing to other district. In PGPR Sivagangai, Tirunelveli, Tuticorin, and Tenkasi Soil antagonistic microbes viz., Pseudomonas sp. and PGPR. were isolated from the rhizosphere soil using King’s B medium and Nutrient agar medium (NA) respectively and tested against Macrophomina phaseolina and Sclerotium rolfsii among the effective PGPR isolates of GNP4 highest percent mycelia growth inhibition of M. Phaseolina (48.31.%) and S. rolfsii (40.47), these isolate further confirmed and sequenced for PGPR is Pseudomonas sp (OM908755.1).