Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (16): 24-28.doi: 10.11924/j.issn.1000-6850.casb15100118

Special Issue: 园艺

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Evaluation of 7 Walnut Cultivars’ Seedlings Under Cold Tolerance

Ma Ting, Li Jing, Ning Delu   

  1. (The Woody Oil Engineering Research Center of Yunnan Province/ Oil Research and Development of Provincial Innovation Team/ Economic Forest Institute, Yunnan Academy of Forestry, Kunming 650201)
  • Received:2015-10-27 Revised:2015-12-21 Accepted:2016-01-22 Online:2016-06-17 Published:2016-06-17

Abstract: Seedling leaves of 7 walnut cultivars in Yunnan Province were taken as the materials, and the relative conductivity, soluble sugar, soluble protein and malondialdehyde (MDA) content were measured under different cold stress treatments. The results showed that: with temperature decrease, the relative conductivity, soluble protein and MDA increased, and soluble sugar presented an increase-decrease-increase trend. The relative conductivity was fitted with the logistic equation to calculate the critical lethal temperature (LT50) of the 7 cultivars as: ‘Yangpao’(-3.6℃), ‘Tiehetao’ (-5.13℃), ‘Dashake’(-2.17℃), ‘Yunxin 306’(-4.56℃), ‘Yunxingaoyuan’(-5.91℃), ‘Wen 185’(-7.10℃) and ‘Xinxin 2’(-7.37℃). Comprehensive evaluation using the membership function indicated that the ranking of cold tolerance of the tested walnut cultivars was: ‘Xinxin 2’> ‘Wen 185’> ‘Yunxin 306’> ‘Yunxingaoyuan’> ‘Tiehetao’> ‘Dashake’> ‘Yangpao’.