Chinese Journal OF Rice Science >
Analysis on Evolution of Major Rice Cultivars in China
Received date: 2018-09-20
Revised date: 2018-10-11
Online published: 2018-11-10
【Objective】Wide application of improved varieties is an important measure to develop high-yield, good quality and high-efficiency agriculture. It means that old varieties are replaced by new ones, namely, variety evolution. The insight into the evolution pattern of varieties not only helps understand the breeding history, but also provides a reference for breeding and supervision. We developed an algorithm for objective calculation of the replacement pattern of rice varieties in this study. 【Method】Based on the ASP. net platform and VB. net syntax, a program was compiled to analyze the rice variety data collected in SQL Server 2008 database, and the general rules of rice variety evolution in China in the past 30 years were obtained. 【Result】Program analysis shows that the average annual replacement rate of rice varieties is about 11.1% based on the area change algorithm, and 29.7% based on the variety number change algorithm. 【Conclusion】In rice production in China, the improved varieties have been replaced at a faster rate for a long time. The reasons for the high rate of varieties succession are analyzed, and some suggestions are put forward to improve the breeding efficiency.
Key words： major cultivars; cultivar evolution; rice
Hai LIN, Tingting LI, Hanhua TONG, Zhigang WANG, Lei WANG, Zhiguo E . Analysis on Evolution of Major Rice Cultivars in China[J]. Chinese Journal OF Rice Science, 2018 , 32(6) : 565 -571 . DOI: 10.16819/j.1001-7216.2018.8107
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