ABSTRACT

The biological component known as Plant - growth Promoting Activity is thought to enhance plant growth. Actinomycetes is one category that plays a significant part in fostering plant growth. The present study showed the evaluation of plant growth promoting activity of Streptomyces diastaticus isolated from maize rhizosphere soil. Using Salkowsky's reagent and colorimetric quantification, a total of 18 isolates were screened for auxin production. The standard curve of IAA (Indole-3-acetic acid) was plotted against a wavelength range of 530 nm. The concentration of IAA produced by S. diastaticus was very high. The highest phosphate solubilizing efficiency was showed by S.diastaticus. Ammonia production was also found to be positive. The seed germination and plant growth was carried out In-vitro screening. Significant increase in shoot and root length was observed after 5 and 7 days with S. diastaticus compared to water treated control plants by Ragdoll method. The development and growth of Chilli were greatly enhanced by a strain of Streptomyces sp. having high plant growth promoting capabilities. As a result of the study, it can be concluded that the rhizospheric PGP Streptomyces diastaticus is an excellent agent to be developed as bioferlizers for growth promotion and yield enhancement in chilli crop and can be used for the industrial synthesis of a variety of agro-active chemicals. Keywords: Streptomyces sp., Rhizosphere, Chilli, Plant growth promoting, IAA, Vigour index.
Publication date: 01/10/2023

https://ijbpas.com/pdf/2023/October/MS_IJBPAS_2023_7447.pdf

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https://doi.org/10.31032/IJBPAS/2023/12.10.7447