Compositions and methods for reducing the level of nornicotine and N\u2032-nitrosonornicotine in Nicotiana plants and plant parts thereof are provided. The panel has front and rear surfaces having different appearances and either surface can be exposed. On each housing part 14, 16 the carriage apparatus 20 is engaged by a motor. An array of hybrid nanostructures and a method for fabricating the hybrid nanostructures are also disclosed.