Male sterility: Male sterility is defined as an absence or non-function of pollen grain in plant or incapability of plants to produce or release functional pollen grains and this mechanism promote the cross pollination. Eg. Cotton, Bajra etc.
Self-Incompatibility: It refers to the failure of pollen to fertilize the same flower or other flower of the same plant, or it is the failure of pollen tube to penetrate the full length of style and effect fertilization. Eg. Mustard, cauliflower and cabbage etc.
