Open Access Research Paper Views (698) Inhibition of persian walnut (Juglans regia L.) microcuttings browning by utilizing different methods Abdollah Ehteshamnia, Mansour Gholami J. Biodiv. & Environ. Sci. 5(2), 562-571, August 2014. Keywords: Activated charcoal, Ascorbic acid, Browning, Polyvinyl pyrrolidone, Subculture Details