Plant Beneficial Endophytic Bacteria from the Ethnomedicinal Mussaenda roxburghii (Akshap) of Eastern Himalayan Province, India

Abstract

Mussaenda roxburghii are very important ethnomedicinal plant, used for its various applications from the ancient period. The role of their associated plant beneficial endophytic bacteria was evaluated, which were previously untapped. Among the isolates, PAK6 was identified as efficient phosphate solubilizer, quantified by the molybdenum blue method. Four isolates PAK1, PAK2, PAK3, and PAK8 were able to synthesize significant level of IAA in the presence and absence of tryptophan. Isolates PAK1 and PAK9 were able to produce siderophore on CAS agar media, PAK2 and PAK9 were able to produce HCN, and PAK7 and PAK8 were able to grow on N2-free medium. All the isolates were able to produce a moderate level of polysaccharide and tolerate up to 10% of NaCl. Isolates PAK3, PAK6, PAK7, and PAK8 were able to grow well at pH 5.0 and isolates PAK2, PAK7, and PAK8 were able to tolerate 600 μg mL−1 of Al+3, while all the isolates except PAK1 showed a tolerance to 600 μg mL−1 of Mn+2 tested. Endophytic bacterial isolates PAK6 and PAK9 were effective against Sclerotinia sclerotiorum and Sclerotium rolfsii.

Identification and Optimization of Fermentation Medium for Production of Antibacterial Compounds from Endophytic Streptomyces sp. GBTPR-167

“…Even though microorganisms can be found literary throughout the world, efforts are still required to study the microbial biodiversity, given that there are still 99.99% of microbial taxa that waits to be discovered (Locey and Lennon, 2016). Endophytic microorganisms are an exceptional resource of therapeutic products (Pandey et al, 2015). As the largest phylum under the bacterial kingdom, Actinobacteria has gained tremendous amount of attention from the scientific community as they produce secondary metabolites of medicinal and agricultural significance (Jakeline et al, 2009;Barka et al, 2016).…”

Inside the Plants: Endophytic Bacteria and their Functional Attributes for Plant Growth Promotion

“…They colonizes internal tissues either as obligate or in facultative manner with host plants without causing any immediate negative or external symptom to host and reported to shows the beneficial effects, put forward opportunities for discovering products and processes with potential applications in agriculture, medicine and biotechnology (Pandey et al, 2012;Pandey et al, 2014;Pandey et al, 2015;Pandey et al, 2016;Pandey et al, 2016a). Bacterial endophytes stimulate plant growth, directly or indirectly thereby increasing their yield and several parameters utilized by living things for their life prospects (Gray and Smith, 2005;Pandey et al, 2012;Pandey et al, 2015;Pandey et al, 2016). Researches have been conducted on the plant growthpromoting abilities and the forest regeneration with the help of various micro-organisms.…”

Arsenal of Endophytic Actinobacterial Microbes

“…Most Plants of the world are a potential reservoir of indigenous microbes chiefly known as endophyte which can reside inside their tissue without giving any visible external symptoms which responsible for nutrient assimilation and their processing, induction of defense system, and synthesis of secondary metabolites (Pandey et al, 2014;Pandey et al, 2016). They may be actinomycetes, bacteria or fungi.…”

“…They may be actinomycetes, bacteria or fungi. They colonizes internal tissues either as obligate or in facultative manner with host plants without causing any immediate negative or external symptom to host and reported to shows the beneficial effects, put forward opportunities for discovering products and processes with potential applications in agriculture, medicine and biotechnology (Pandey et al, 2012;Pandey et al, 2016). Researches are focused on the investigation of actinomycetes endophytic diversity and their relationships with host plants.…”