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China is one of the world's cultivated walnut origin, walnut cultivation has a long history, the germplasm resources are extremely rich. Not only is the dominant regional economic development around the industry, is also an important export product, occupies an important position in the international market. The grafting technology breakthroughs and new varieties, especially early fruiting the walnut cultivar selection and promotion of improved varieties of walnut industry level has increased every year. But the relatively of other fruit trees, walnut grafting relatively high technical content, technology popularization and promotion of relative difficulty, leading to the high price of the seed walnut grafted seedlings, and in short supply. To this end, early walnut seedling progenies Phenotypic variation research. The main findings are as follows: 1. Early fruiting the walnut seedling progeny test area plant height, crown diameter, stem weeks and the results of branch length coefficient of variation of 15%, showed a rich genetic diversity. The coefficient of variation of the length of the fruiting branches, 26.41% and 24.52%, respectively. The the the fruiting branches roughness coefficient of variation of only 10.34% and 6.47% respectively. Coefficient of variation of the two experimental zones tested plants tree traits steeled order: sticks roughness, plant height, crown diameter, dry weeks, the results of branch length; Taian pilot area of ??the tested plants tree traits variation trend with The Jining consistent. Early solid walnut seedling offspring round and oblong fruit, nuts, round and oblong, the few flat round, fruit color brown, beige, pale yellow color, the color of the nucleolus brown, brown and other colors. Fruit length, diameter, fruit shape index coefficient of variation were less than 12%, and 15% higher than in the average fruit weight, fruit and nuts nuts shell thickness and shelling percentage coefficient of variation, which nut shell thickness variation coefficient as high as 30.73%, showing a rich genetic diversity. Compare two test area as early as can be seen the walnut seedling offspring Fruit and nuts fruit weight and a nut shell thickness, the Jining test area early walnut nuts fruit weight and core-shell thickness greater than Taian test early walnut seedling offspring genetic variation is relatively rich; but Fruit of fruit weight less than Tai'an. Although the coefficient of variation of fruit traits measured differences, but closer to the trend of variation is basically the same. 3. The coefficient of variation of both the test region protein, fat and fatty acids are in the 10% or less, the minimum coefficient of variation of the fatty acid, are relatively stable trait. The variation trend is basically the same. And early solid the the walnut seedlings offspring fruit fatty acid containing 14 kinds of fatty acids, their relative content are more than 90%, mainly palmitic acid, stearic acid, oleic acid, linoleic acid and linolenic acid composition to the content of linoleic acid as the highest . The fatty acid composition of the fruit for saturated fatty acids and unsaturated fatty acids. Wherein a higher unsaturated fatty acid content of more than 80%, about 80% of the total fatty acids, with a higher nutritional value. 4 participants per plant has the apomixis some capacity, highest apomixis capacity reached 13.2%, 5.56% average apomixis ability. Natural pollination the walnut fruit setting rate averaged 68%, apomixis more than 12 times. 5. Early seedling offspring Walnut tree and fruit traits especially rich in the genetic diversity of the core-shell thickness, the potential for further choice experiments and preliminary proposed screening a large fruit type, shell thin, dwarf 4 high and stable yield type-specific fine individual. 6. Use of fine early walnut varieties seedling offspring Park built in walnut production areas in China still has some room for development, but its precondition must ensure seed purity. Therefore, early walnut seedling offspring has made two proposals: First the recommended existing the real raw Hetaoyuan the areas Seedling selection and grafting the head transformation; The second is the future new seedling Hetaoyuan to establish a standard seed collection Park, The strict control provenances guaranteed seed genetic quality.
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