摘要Asian cultivated rice is one of the most important cereal crops and feeds half of the world's population,especially in eastern and southeastern Asian countries (Virmani 2012).It is estimated that about 20% or more increase in rice production would be likely needed in the next 20 years due to the growing population and environmental changes (Virmani 2012).Hybrid rice has proved to strikingly outyield other rice varieties and contributed significantly in increasing rice production by 200 million t from 1976 to 1991 in China (Yuan 1987).To meet the rising global demand for rice,further development of hybrid rice varieties for a higher yield target is still a sustainable strategy.
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