First and foremost mutation refers to the change in the structure of the gene.Mutation in plants causes a change in the appearance of flowers, stem and the fruits of the plant. A plant might change but over a period of time it regains its original colour but not all the plants. Mutation results from random change in the cell of a plant, change in climatic conditions or damage by the plant insects. If mutation occurs in a growing plant, the shoot can be affected and will give rise to the whole cell lines.