Abstract:

A Large number of super-high-yield hybrid rice varieties had been developed by two main ways: the three-line system and the two-line system. While the high yield of hybrid rice had been subject to the instability of seed setting rate for the difference in the level of cultivation and management, and the ecological condition. To some extent, both source-sink relationship and temperature mainly induced the instability of hybrid rice seed setting rate. This paper reviewed the main factors and their induction mechanisms on the hybrid rice seed setting differentials, and introduced the advances of research on evaluation of inducement. Finally, some main problems needed for further study were put forward. This paper was helpful to further reveal the cause of seed setting rate instability, and direct the inducement mechanism of the factors above. Inducement analysis to seed setting rate differentials is essential and important for crop breeding and cultivation.