Research on The Main Organ Characters in Fine Varieties from Bud of Yali Pear(Pyrus bretschneideri)

In order to lay the foundation for breeding new varieties of Yali pear,the biological and genetics characteristics in two fine varieties from bud of Yali pear(Juyali pear and Guangyali pear) were researched by observing and analyzing.The results demonstrated:Juyali pear,the fruit was very big,the diameter of corolla was longer,the number of petal was more,the vertical diameter of pollen was longer,the thickness of leaf and fence organization were both thicker,the chlorophyll content and the net photosynthetic rate both were higher.Juyali pear with especially big fruit was the new variety of Yali pear.Guangyali pear,the fruit surface was clean(fruit spot was big and thin,area of rust stain was small),the sarcocarp was fine,crisp and with more acidity,the lenticel in branch and stoma in leaf were both less,the maturity date of fruit was about 7 d ays later than general pear(CK).Guangyali pear with good external and internal quality was the new variety of Yali pear.Compared to general Yali pear,Juyali pears increased one band(Rf 0.206) and decreased one band(Rf 0.556) in stamen.Guangyali pears increased two bands(Rf 0.079 and Rf 0.127) in tip of young stem,increased one band(Rf 0.560) with more activity in young fruit(Ф 1 cm) and decreased one band(Rf 0.860) in young fruit(Ф 2 cm).Juyali pear and Guangyali pear had both common genetic basis and genetic differences to general Yali pear,and they both were the new varieties of Yali pear.