J Integr Plant Biol. ›› 1987, Vol. 29 ›› Issue (2): -.

• Research Articles •    

Studies on the Relativity Between Chi Pear (Pyrus bretschneideri) Embryo Development and Its Flowering, Fruiting

Xu Fang   

Abstract: The anthers of Chi pear overwinter in sporogenous tissue and form microsporocytes at the early or middle March. The microsporogenesis belongs to the simultaneous type. The mature pollen grain is a two-celled structure. The megasporocyte which belongs to the crassinucellate type is formed among the cells of the third layer at the top of nucellus during the end of March or at the early April. The development of embryo sac conforms to Polygonum type. In the Apirl, the fertilized egg starts its cross-division after the dormancy period and undergoes the following stages, such as the clavate proembryo, the global proembryo, the heart-shaped embryo and torpedo-shaped embryo stage. In the middle of July, the young embryo gets ripe gradually. The embryo development of Chi pear belongs to Chenopodiad type while the endosperm development of Chi pear belongs to Nuclear type. In Chi pear, there are stable relations in its microsporogenesis, megasporogenesis, its male, female gametophytes formation and its flower bud, flower morphological character. There is also a certain interrelation of development be- tween the fruit, the embryo and the endosperm.

Key words: Chi pear (Pyrus bretschneideri), Embryonic development, Relativity of flowering and fruiting

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