Diversification of Resistance to Fruit Shrink Disease in Chinese Jujube Germplasm
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    Abstract:

    Two hundred and sixty eight kinds of jujube germplasm growing in Cangxian County, Taiyuan City and Taigu County were employed to evaluate resistance to fruit shrink disease(FSD) in field trials during fruit white-ripening stage (early September). There are significantly differences both in percentage of diseased fruit (PDF) with the large range of 0%~66.18% and disease index (DI) with the large range of 0%~55.06% among cultivars. The severity of FSD varied with the year evaluated and the different positions such as Taigu, Canxian and Taiyuan. The resistance to FSD of cultivars might be divided into five groups, which is based on the average of DI over the year of 2006 and 2009 in Cangxian County, i.e. 0%~5%, 5%~10%, 10%~15% , 12%~25% and more than 25%. Of 77 jujube cultivars tested in Cangxian County, 80.52% were evaluated as high resistant, 2.60% resistant, 7.79% moderately resistant, 6.49% susceptible and 2.60% high susceptible. Among the cultivars mainly grown in China, both ‘Pozao’ and ‘Hupingzao’ is the high susceptible cultivars, and ‘Jinsixiaozao’, ‘Yuanlingzao’, ‘Changhong’ , ‘Dongzao’ is the high resistant cultivars.

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History
  • Received:September 29,2010
  • Revised:December 22,2010
  • Adopted:May 03,2011
  • Online: June 01,2011
  • Published:
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