STUDIES ON THE EFFECT OF INOCULATED Pseudomonas STRAINS ON PLANT GROWTH PROMOTING POTENTIAL OF RHIZOSPHERIC SOIL OF APPLE
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Date
2016
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UHF,NAUNI
Abstract
ABSTRACT
Apple replant disease has plagued apple growers for many years and is now found in most fruit growing regions world-wide. The use of plant growth promoting rhizobacteria (PGPR) for the benefits of agriculture and horticulture is gaining worldwide importance and viewed as a novel and potential tool for providing substantial benefits to the horticulture. In the present study, isolation and characterization of fluorescent Pseudomonas sp. from replanted site of apple orchard (Shimla HP) was done. The eleven Pseudomonas isolates and four already isolated Pseudomonas strains L, M, C and G were screened out for various plant growth promoting activities like siderophore, phosphate solubilization, antifungal activity, plant growth regulators (auxins, cytokinins and gibberellins), lytic enzymes and production of HCN and ammonia. On the basis of PGPR activities, two isolates (ArSh-3 and ArSh-4) were genotypically characterized by 16S rRNA gene sequencing. Already isolated Pseudomonas strains L, M, C and G used in different liquid formulations of individual and consortium fluorescent Pseudomonas to treat apple plants in replanted site of orchards at Sharontha and Siao. The performance of apple plants was much better in terms of root colonization capacity, plant establishment and increase in plant growth in terms of plant height, number of nodes, chlorophyll content of leaves, plant growth promoting activities and NPK of rhizosphere soil over their respective control after twelve months of treatment. These strains can be further exploited for management of replant problem of apple after conducting few more field trials in replanted sites and can have great importance in the field of horticulture.
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