Abstract:

The purpose of this study is to analyze the adaptability of a new rice variety ‘Yulong 7’ in the cold region, in order to provide reference for the adaptive breeding of rice varieties in the cold region. The rice variety ‘Yulong 7’ was used as material. The growth days, accumulated temperature and yield of hectare were investigated and analyzed in Heilongjiang Province, the Inner Mongolia Autonomous Region and Hubei Province. The results show that ‘Yulong 7’ could achieve not only good production in the first accumulative temperate zone of Heilongjiang Province, but also good introduction and identification results in the lower accumulative temperate zone of Heilongjiang Province, the Inner Mongolia Autonomous Region and Hubei Province, and it could be used in production in a certain range of area. Further analysis show that the strong adaptability of ‘Yulong 7’ comes from its rich genetic basis, as well as more suitable selection and identification methods. The adaptability of ‘Yulong 7’ reveals that only using the main cultivar suitable for local ecological conditions as the core germplasm and adding new gene sources can improve the adaptability and expand the suitable area of rice varieties.

Key words: rice, cold region, breeding, ‘Yulong 7’, introduction, identification, adaptability