Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (8): 1455-1464.doi: 10.3864/j.issn.0578-1752.2012.08.001

• CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS •     Next Articles

Study on the Renewed Tendency and Key Backbone-Parents of Inbred Rice Varieties (O. sativa L.) in China

 TANG  Sheng-Xiang, WANG  Xiu-Dong, LIU  Xu   

  1. 1.中国水稻研究所，杭州 310006
    2.中国农业科学院农业经济与发展研究所，北京 100081
    3.中国农业科学院，北京 100081
  • Received:2011-10-24 Online:2012-04-15 Published:2012-01-17

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Abstract: 【Objective】The objective of the study is to explicit and understand the renewed tendency and key backbone-parents of inbred rice varieties (O.sativa L.) since 1949. 【Method】 The present study tracked and analyzed the blood relationship of 3 656 inbred rice varieties bred and extended in China. 【Result】The study indicated that during the latest period of 60 years, by dwarf breeding, inbred rice varieties have been renewed in mass scale for 8 times, among which 3 times appeared in the years of 1953-1977 and another 5 times in 1978-2010. The blood relationship analysis of variety genealogy indicated that there are 35 most important key backbone-parents (19 indica and 16 japonica ones) have been widely and long utilized in rice breeding for structuring new varieties with high yielding potential and ideal traits. On the other hand, the study also showed that though there was a rapid increase in terms of per unit yield and total rice production, but the rate of rice germplasm innovation and utilization slowed down, and the extension area and occupied proportion of modern inbred rice varieties with high yield potential reduced in the past 30 years. 【Conclusion】The release and mass extension of more than 4 000 modern inbred rice varieties as well as varieties renewed for 8 times in mass scale during 1949-2010 are the major factors in increase of inbred rice production in China. However, challenges will be faced in rice breeding programs: how to strengthen exploration, introduction and utilization of excellent rice germplasm, and how to overcome germplasm bottleneck for continuously releasing new rice varieties.  

Key words: rice, inbred variety, key backbone-parent, genealogy analysis, genetic improvement

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