Heterosis Expression of Hybrid Rice in Natural- and Short-Day Length Conditions

Development of hybrid rice is an important strategy to increase yields of irrigated rice in China. Day length is a highly important environmental factor for hybrid rice adaptability, productivity and quality. Heterosis of hybrid rice has been utilized under natural- (long) day length conditions in the middle and lower reaches plain of Yangtze River Valley in China for a long time. However, whet…