‘Green revolution’ in 1960s and successful utility of heterosis in 1970s have resulted in two successive leaps in rice productivity. Although extensive breeding efforts were made for high yield in past decades, the yield potential of modern rice varieties has remained stagnant for many years. However, the world’s rice production need to double again by the year 2030 to keep up with the demands of a growing population and much of this increase will mainly depend on improved rice cultivars. Therefore, further improving yield potential has been the top priority in almost all rice breeding programs worldwide.
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