Observational Research on Flower Bud Differentiation and Flower Phenophase of Pear Variety 'DANGSHANSULI'

In order to determine the flower bud differentiation period and learn about the flowering process of the pear variety 'Dangshansuli'(Pyrus bretshneideri Rehd.),shortshoot terminal buds of the pear variety were selected as the test materials and the flower bud physiological differentiation stages were identified and recorded by the means of field intermittent leaf removal,and the longitudinal section pictures of different flower bud morphological differentiation stages were taken and recorded by hand-made slices and Olympus BX51 microphotography.The results showed that its flower bud physiological differentiation started in early June and lasted until mid-to-late July,that its flower bud morphological differentiation started in late July and the stamen appeared in mid-September while the pistil appeared in mid-to-late October.In the following year,the flower bud began expanding in late March,experienced consecutive stages of inflorescence elongation,inflorescence separation,white bud,big bud,initial bloom,full bloom,late bloom and petal fall and the flower phenophase ended in mid-April.The results of the experiment provided some theoretical basis for taking suitable measures to promote flower bud differentiation of the pear variety'Dangshansuli' and improve its fruit output and quality during its florescence.