Citation: Gurdev S Khush. 1993. Varietal needs for different environments and breeding strategies. Pages 68-75. In: K. Muralidharan and E.A. Siddiq (editors). New Frontiers in Rice Research, Directorate of Rice Research, Hyderabad, India.

Keywords: Oryza sativa, rice breeding, yield potential, area plant to rice worldwide, irrigated rice, rainfed wetland rice, dryland rice, deepwater rice, tidal wetlands, increasing sink size, increasing spikelet filling, increasing biomass production, harvest index, new plant type, breeding strategies, embryo rescue, somatic hybridization, anther culture, molecular markers, novel genes introduced into rice