| To date, interspecific Hybrid F1 between Corylus heterophylla Fisch. and Corylus avellana L. is widely introduced and planted tree species in the North Chinese. Factor limiting tree cultivation is "shoot shriveling", the overwintering branches water dry phenomenon. To solve the problem of hybrid hazelnut shoot shriveling, the most effective method is breeding varieties (lines) of shoot shriveling resistant. In this study, the two resistant shoot shriveling varieties (lines) as materials, the research studied the hybrid hazelnut extraction resistance varieties (lines) and Anti shoot shriveling lines of physiological indexes and group differences in anatomical structure and morphological characteristics. To explore the morphology of anti shoot shriveling the physiological mechanism of resistance varieties (lines) of the shoot shriveling. To explore the mechanism of resistance shoot shriveling hybrid hazelnut and identification of hybrid hazelnut and anti shoot shriveling excellent lines and to provide the prevention measures scientific basis and effective. The results are as follows.1. Hybrid hazelnut varieties (lines) 82-7,85-73 and 84-254 Anti shoot shriveling ability, index of shoot shriveling, In 2014 and 2015 the shoot shriveling index was 0. lines 84-524,82-8,84-36,84-402, anti shoot shriveling capacity is weak, in 2014 and 2015 the shoot shriveling index were 48.88%,32.23%, 31.07%,12.13% and 89.62%,75.36%,89.35%,63.21%.2. Overwintering period Anti shoot shriveling varieties (lines) 82-7,85-73,84-254 show good performance of anti dehydration. One year old branches of moisture in the winter continue higher, From 2014 January to March anti shoot shriveling varieties (lines) water content is in the range of 41.54%-47.55%, not shoot shriveling water content is in the range of 26.36%-42.46% strains. On March 6, 2014,7 varieties (lines) of the water content of branches and shoot shriveling index correlation coefficient r = 0.9929**.3. The growing season in 2014, hybrid hazelnut of anti shoot shriveling varieties (lines) shoot water content of branch and proline content, were significantly higher than that of not shoot shriveling lines.7 varieties (lines) of the water content of branches and trees sprout index in 2015, the correlation coefficient was r= 0.8347*.4. Anti shoot shriveling varieties (lines), the density catheter, total area of vessel, catheter/xylem ray, the number of ray and cross-sectional area were significantly higher than that of not shoot shriveling lines, 7 varieties (lines) of these indexes and the 2015 tree shoot shriveling index of correlation coefficient r= 0.6242*, r=-0.7142* r=0.6126* r=0.6402* and r=0.7490* respectively. Anti pumping varieties (lines) of branch vessel cell average length, average diameter was significantly higher than that of anti pumping lines. Anti shoot shriveling varieties (lines) were significantly lower than that of the width of the stomata resistance strip lines.5. Anti shoot shriveling variety (lines), the thickness of leaf, vein protuberant degree, ration palisade spongy, cell tense ratio, petiole thickness and vascular bundle thickness were significantly higher than that of anti pumping lines,7 varieties (lines) correlation coefficients of these indexes and the 2015 shoot shriveling index were r=0.7791*, r=0.4777, r=0.7135*, r=0.6618*, r=-0.9159* and r=-0.6728.6. Anti shoot shriveling lines tree height, crown large, strong growth potential, which may be hazelnut anti shoot shriveling varieties (lines) of anti shoot shriveling feature tree.In summary,82-7,85-73,84-254 of the 3 varieties (lines) in growing season of branches and petioles with moisture properties, during the wintering period to maintain a high water content, branches lenticels small area, branch catheter density, total area of vessel, ray number more, These features are 3 varieties (lines) the main physiological mechanism of anti shoot shriveling. |
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