The Effective Pollination And Fertilization Of Apple-pear And Its Influencing Factors

The experiment studied the course of pollination and fertilization and factors that affected the course by observing pollen germination and pollen tube growth in style.Mixed pollen made up of greater part of YaLi pear?s,XieHuaTian pear?s pollen,YaLi pear / s pollen,and apple-pear tree were all used in the ~xperiment.Main results were followed.I.It was about 2 hours that mixed pollen germinated on the stigma,but XieHua Tian pear?s pollen and YaLi pear?s pollen were 4 hours,and it took 10 hours that pollen tube began to go into the stigma.Most of pollen tube went into the style?s upper after 24 hours,and it went into the style?s middle after 36 hours,then it went into the ovary after 56 hours.It was 72?6 hours that most of pollen tube acrossed the ovary and fonished the course of pollination and fertilization.2.The effective pollination period of apple-pear was rather long,usually it was 6 days. The best pollination date was the 2nd to 5th day after blossom.3.Apple-pear still fruited normally when it was pollinated by the low pollen germination rate in vitro.Under the cendition of enough pollen,if pollen germination was rate more than 20%,its fruit-setting rate of in florescence would exceed 70%.4.When pollen in virtro that was to pollinate the flowers of apple-pear germinated,the suitable medium was 5~?15% sucrose and 1 00挆400 mg. I] boric scid,and the suitable temperature was 25-~300C .In addition ,result showed that Boron was the essential factor to tube growth.5.The rate of self-fruitfulness in apple-pear was zero.