Molecular interaction of strigolactone with different phytohormones and their effects on plant growth and development

Strigolactones are small group of molecules produced in plants and can act as signaling molecule to regulate enormous amount of activities via networking with other phytohormones in plants. Starting from seed germination activity it directly or indirectly regulates shoot and root architecture, secondary growth, leaf architecture triggered either through endogenous or exogenous factors. Auxin, ethylene and strigolactones are main players which regulate root formation while auxin, cytokinin and strigolactone regulate shoot architecture apart from other phytohormones which not majorly but seem to regulate root and shoot architecture under different conditions. Activity of gibberellic acid (GA3) under the control of strigolactone at molecular level, still not much explained, however its physiological activity seems antagonist to strigolactone. Abscisic acid (ABA) and strigolactones are reported to regulate guard cell opening and closing in parallel manner as well as found active during different biotic as well as abiotic stresses. The networking with brassinosteroid is important for regulation of mesocotyl elongation and nodulation in rice. There is no direct/main role of strigolactone activity but it plays important role through interaction with other phytohormones in plants. In the present review, role of strigolactone and its interaction with various phytohormones is discussed.