Genesis of microspore,megaspore and the development of male gametophyte,female gametophyte in Mahonia duclouxiana Gagnep.

The microsporogenesis,megasporogensis and the formation of male gametophyte and female gametophyte in Mahonia duclouxiana were first reported.The main results can be concluded as follows: anthers are tetrasporangiate; the wall development is dicotyledonous type; glandular binucleate tapetum; endothecium of the chamber develops characteristic banded thickening during the maturation.Cytokinesis of meiosis in microsporocyte is successive and the tetrads are biaxial symmetrical.Pollen grains are mainly 2-cell type when shedding.Solitary pistil is monocarpellary with 4-6 ovules,marginal placenta,crassinucellate with double integument.Micropyle is formed in both inner and outer integument,shaped as "Z"; single archesporial cell locates under nucellar epidermis; the tetrad of megaspores is linear,the first cell from the chalazal end develops functional megaspore,the development of embryo sac is Polygonum type.