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Geographic Variations and Estimate of Genetic Parameters for Seed and Growth Traits in Chinese Wing-nut Tree (Pterocarya stenoptera) Provenance at Seedling Stage

LI Ji yuan 1,ZHONG Jia duo 2,RAO Long bing 1 (1.Research Institute of Subtropical Forestry,CAF,Fuyang,Zhejiang 311400; 2. Forestry Bureau of Tong ling County, Anhui)  
The Chinese wing nut tree provenance trial containing 53 seedlots collected from its full distribution zone was conducted in Tongling,Anhui province.The tested provenances significantly differed in weight per 1000 seed's,laboratory seed germination and growth traits at seedling stage.The best provenance was greater than the worst by 184% for height, 127% for ground diameter and 74% for dry biomass,respectively.It was found that there were close phenotype and genetic relationship between growth and biomass traits at seedling stage,and seed weight and germination were highly explained by genetic effects with the broad sense heritability from 0 97 to 0 99, however, seedling growth and biomass were influenced mainly by genetic effects with the broad sense heritability from 0 57 to 0 72.The results showed the apparent longitude pattern for weight per 1000 seeds,and latitude pattern for ground diameter and dry biomass between seedlots,which meant that eastern seedlots for seed weight were greater than western seedlots,and southern seedlots could be better than northern ones for diameter at ground level and dry biomass.The provenance variations could be highly influenced by some factors,such as water systems and climate zone.As a result,the different geographic variation patterns existed in the Yangtze River valley,Li River-Xiang River-Dongtinghu Lake water system,Western region,Coastal region,Southern Yangtze River Region and Northern Yangtze River.The combined selection index was constructed as the equation below:I=0 2891X 1(dry biomass)+0 0058X 2(seedling height)-0 03136X 3(ground diameter),and thus 5 superior provenances e.g.Ji'an in southern Jiangxi,Hanzhong in central Shaanxi, Wuning in northeastern Jiangxi, Daxian in the central Sichuan,as well asYiyang in Dongtinghu Lake of Hunan,were screened out based on the index.
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