During different phases of in vitro culture. plant tissues may be exposed to some stresses that never encounter in their natural habitats. The most significant stresses which interfere with in vitro culture are pathogenic contamination and browning disorder. Since browning sign is occurred during all phases of in vitro culture of Spartium junceum L. https://www.findingthestory.com/product-category/mandrel-bend-markout-system/