Commercial development of hybrid rice depends on the availability of high quality seed, which can come about only through
improved hybrid seed production techniques. Improved technique has to depend on its basic tools; improved male sterility, its
maintenance and fertility restoration system. Rice being strictly self pollinated crop, to achieve high outcrossing potential on
cytosterile lines is a serious challenge to hybrid rice breeders. High and true to type outcrossing will depend on strict isolation
of seed production areas, through roguing of off-type plants and rigid operating rules can help to achieve required seed purity.
In this review of literature the factors that control hybrid seed production mechanism in rice are discussed.