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In this study, Akiko pears system the Yanbian perfume Hoplocampa Health offspring found compact dwarf mutants as test materials, Yanbian area representative varieties of pears and S2 and OH × F51 , OH × F69 the rootstock of control , tree growth , the growth characteristics of the branches and leaves of field resistance were compared . The main findings are as follows : dwarf germplasm infancy than apple-pear 4-5 days later , the end of June shoots slow growth period of 15-17 days , shoots stopped growing season in early August , defoliation in late October The growth period is 182-184 days . The average leaf area of 79.9cm blade thickness of 0.0441 cm blinds weight of 214.25g , and control apple-pear average leaf area 59.3C m2 , blade thickness of 0.030 cm venetian weight 152.6g , the difference between the two significant. Dwarf germplasm 20 cm long branches within 22-26 pieces , number of leaves and apple-pear 5-6 tablets . Dwarf germplasm Phyllotaxy 2 /8 sequence , and apple-pear 2/6 . The middle of the dwarf the Germplasm annual shoots thicker than the base , the average length of 15-33 cm , the length of the section to 0.6cm , roughness of 1.1 cm of control apple-pear 26.5% , 14.89% and 100% , respectively ; tree shaped upright shape , 1-5 year old tree against 6.6 % -22% of the apple-pear tree width of 21.15% ; germination rate of 65% , notches bud branching number ( 15cm ) 2-3 a spur ratio was 72.4% , the branch bark was 45% . 2005 -2009 field survey results show that dwarf germplasm pear scab , pear psylla stronger resistance ; cold resistance close to the apple-pear , several years of the average frost damage times a the PDR54 frost damage times 2-3 , OH × F51 4 . In summary, the Yanbian small perfume pear accidental seedling dwarf mutation the body leaves large , dark green leaves , thick texture , shoot growth , roughness , the short , high rate of branch bark , crown dwarf , compact and so on, has a strong photosynthetic performance . Pear scab and pear psylla pear pests and diseases at the same time has a strong resistance , cold resistance close to the apple-pear . Dwarfing germplasm of this test is Pyrus both rare dwarf, but also has a strong resistance to resources , its future dwarf pear varieties and dwarfing rootstock breeding dwarf gene cloning and transgenic research has a very important significance .
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