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《ACTA BOTANICA BOREALI-OCCIDENTALIA SINICA》 1994-04
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EMBRYOLOGICAL STUDIES IN GENTIANA MACROPHYLLA

Li Huijuan and Wang Yaozhi(Department of Biology, Lanzhou University , Lanzhou 730000)  
A flower in Gentiana macrophylla has 5 stamens,the deveopment of anther walls conformsto the dicotyledonous type. Tapetum is of plasmodial type and some cells become two-layered atthe later period. Cytokinesis in the microsporocyte meiosis is simultaneous type and microspore te-trads are mainly tetrahedral.Pollen grains are 2-celled,global shape with three grooves. The ovule is anatropous,unitegmic and tenuinucellate.A monocellular archesporium devel-ops into megasporocyte directly. The megasporocyte undergoes meiosis and forms a linear tetrad.Most of the functional megaspores which develop into Polygonum type embryo sac come from thechalazal megaspore,only a few are from the second megaspore of the chalazal end. The fertiliza-tion belongs to the premitotic type of syngamy.Embryogeny conforms to the Solanad type,en-dosperm formation is of Nuclear type ,Cell wall of early endosprem cell is from the free growthwalls which are near the embryo sac wall.
【Fund】: 甘肃省自然科学基金
【CateGory Index】: Q949.776.4
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