• Sirsath D.B
• Shinde S.Y

Plant growth regulators or phytohormones are organic substances produced naturally in higher plants, controlling growth or other physiological functions at a site remote from its place of production and active in minute amounts. The discovery of plant hormones and their ability to regulate all aspects of plant growth and development were defining moments in horticulture. Plant Growth Regulators (PGRs) were soon identified that could improve yield, quality and postharvest life. The discovery of auxins, NAA was found to both to useful in counteract two of the most serious problems of apple production, biennial bearing and preharvest drop.. The discovery of gibberellins and cytokinins led to commercial uses of products in these hormone categories that include improved shape of fruit, enhanced market value by reducing blemishes, optimise tree architecture that may be accomplished the by overcoming apical dominance. The naturally occurring hormone abscisic acid is showing potential for overcoming plant stress and also enhancing early fruit drop. Rhizosphere microorganisms as well as plant secondary metabolites are well-known for their role in improving growth patterns of roots as they result in rhizosheaths formation around the roots and protecting them from desiccation, pollutant degradation, maintenance of primary cellular functions and from antimicrobial activity of various predators. Many mechanisms have been described for the action of PGPR. Some strains produce metabolites such as hydrogen cyanide, 2,4-diacetylphloroglucinol; antibiotics, and volatile compounds that motivate plant growth. Other strains are responsible for siderophores production and thus play a critical role in sequestering iron for plants, delay senescence, improve biological control, and produce phytohormones which influence plant physiological processes.

Role of Plant Growth Promoting Microorganisms and Plant Growth Regulators in Agriculture and Research

"Role of Plant Growth Promoting Microorganisms and Plant Growth Regulators in Agriculture and Research", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 12, page no.328-331, December-2021, Available :http://www.jetir.org/papers/JETIRFI06058.pdf

"Role of Plant Growth Promoting Microorganisms and Plant Growth Regulators in Agriculture and Research", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 12, page no. pp328-331, December-2021, Available at : http://www.jetir.org/papers/JETIRFI06058.pdf