Abstract
Endorhizospheric bacteria also known as endophytic bacteria that resides within living plant tissues without substantially harming plants have found a large number of applications in today’s agriculture such as nutrient cycling, tolerance to biotic and abiotic stress as well as promotion of plant growth. In present study an attempt has been made to test biodiversity of endophytic plant growth promoting bacteria from different plant species. As nitrogen fixation is one of the prime mechanism of plant growth promoting activity exerted by microorganisms, endophytic nitrogen fixing bacteria were isolated from from surface sterilized plant parts viz. root, stem and leaves of species Cynodon dactylon (Durva), Pothos scandens (Money plant), Ipomea batata (Sweet potato), Saccharum officinarum (Sugarcane) cv. CO.LK-8001 and CO.-84135, Musa paradica (Banana) and Zea mays (maize) cv. GM-6 by using nitrogen free media selective for growth of nitrogen fixing bacteria. In all total 10 isolates were obtained form different plant species and parts and showed variation in their biochemical and physiological characteristics. All the isolates were found to fix nitrogen and nitrogen fixation rates of all the isolates ranged from 4.0 to 36.3 mg N fixed / gm of sugar consumed. Moreover, they also showed solubilizing tri calcium phosphate in Pikovskaya’s broth.
Highlights
It is well known that a large number of microorganisms are found to be associated with plants
Kado defined endophytic bacteria that reside within plant tissue without doing substantial harm or gaining benefit other than securing residency
Endophytic bacteria that provide a beneficial effect to their host plant generally may be organized into two different systems: either they are forming symbiotic relationship through construction of specialized structure such as nodules where nitrogen fixation occurs or they may be free living in plant’s vascular system
Summary
It is well known that a large number of microorganisms are found to be associated with plants. These plant associated microorganisms are the agents for stimulation of plant growth and management of plant and soil health They colonize roots and rhizosphere i.e. the soil surface closely adhered to the plant roots. Endophytic bacteria that provide a beneficial effect to their host plant generally may be organized into two different systems: either they are forming symbiotic relationship through construction of specialized structure such as nodules where nitrogen fixation occurs or they may be free living in plant’s vascular system. Present study was undertaken with the aim to study biodiversity of endophytic bacteria and study of their biochemistry and physiology in addition to evaluate their Plant growth promoting activity
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