Dissertation > Excellent graduate degree dissertation topics show

Experiment on Hybrid Breeding of Korla Fragrant Pear

Author: WuMin
Tutor: LiJiang
School: Xinjiang Agricultural University
Course: Pomology
Keywords: Korla fragrant pear hybrid breeding hybrid seedlings hybrid combination
CLC: S661.2
Type: Master's thesis
Year: 2011
Downloads: 166
Quote: 0
Read: Download Dissertation

Abstract

This paper chose Korla fragrant pear as the subject of study.Through researching on several key problems which involved fruit setting rate of cross-pollination,fruit quality,budding characteristics of hybrid seeds,morphological feature for one-year hybrid seedlings,the vegetative state and separate variability traits in different hybrid combinations,the effective indicators for early selection of hybrid progeny of Korla fragrant pear were determined.The main results were as follows:1 In the pollination test of Korla fragrant pear with other thirteen pear cultivars,the fruit setting rate all reached more than 60.0%,which was higher than the others when Xingshui,Xuehuali,Jinhua and Yali were used as male parentage;the different management of disposing of the stamens or pistils had no influence on the extent skew of hybrid fruit.Summing up the above,choosing pollinizers such as Xingshui,Xuehuali, Jinhua and Yali can improve the fruit quality of Korla fragrant pear.2 Pollen germination rate was the highest under frozen storage condition,such as Xuehuali,Xinshiji and Yali,whose pollen viability was more than 70.0% after they were stored 127 days in the freezer condition.3 The low-temperature stratification could break dormancy of hybrid seeds.The germination rate of Xiangli X Yali,Xiangli X Jinhua reached at 100.0% when the stratification time was 70 days,and the germination rate of Xiangli X Xuehuali,Xiangli X Qiyuesu reached 85.0% and 100.0% respectively when the stratification time was 80 days.It was observed that the germination rate increased gradually as the time extend and the proper stratification time for hybrid seeds of Korla Fragrant pear was more than 80 days.4 The proper concentration of GA3 could break dormancy and promote the rate of germination of hybrid seeds in various degrees.While the fact that the rate of germination were both higher when the concentration of GA3 was 200mg/L and 300mg/L respectively than 400mg/L in some pear varieties showed that high concentration of GA3 could inhibit seed germination.5 Hybrid seedlings whose male parent were Zaosu,Jinmi,Cuiguan,Suanli showed stronger growth potential than other hybrid seedlings of 12 combination and whose male parent was 81-15-10 showed significant variation in leaf shape,taking on palmate notch shape;plant traits in one-year hybrid seedlings displayed separate variability,among these indexes,the variation coefficient of leaf size and stem length were the largest,which could be used as the effective indicators of early selection for hybrid seedlings.

Experiment on Hybrid Breeding of Korla Fragrant Pear

Abstract

Related Dissertations