it is intended to provide a pure line plant which is required in constructing a seed propagation variety of orchid . an auxin solution is dropped to unfertilized orchid flowers so as to form seeds based on parthenogenesis . then these seeds are germinated and haploid plants are selected from orchid plants thus grown . the germinating seeds judges as haploid plants are grown to give pure line plants having doubled chromosomes . thus , a seed propagation variety of orchid is obtained .