地黄绒毡层二型性的超微结构研究

地黄的花药绒毡层具二型性，来源于初生壁细胞的ｐ－绒毡层，细胞较小，为分泌型绒毡层，在小孢子阶段产生乌氏体，于两细胞花粉阶段解体，来源于药隔的ｃ－绒毡层细胞较大，解体的时间早于ｐ－绒毡层，不同药室的ｃ－绒毡层解体的起始时间不一致，可始于小孢母细胞减数分裂，四分体或小孢子阶段，其径向壁面向药室的壁也较早地开始解体，细胞质碎片与细胞器流入药室，分散在小孢子之间，较早解体的ｃ－绒毡层细胞不产生原乌氏体与乌

AN ULTRASTRUCTURAL STUDY ON DIMORPHISM OF TAPETUM IN REHMANNIA GLUTINOSA

There were two different kinds of tapetal cells in Rehmannia glutinosa(Gaertn.)Libosch.The p-tapetum with small cells was derived from parietal layer and the c-tapetum with large cells was originated from connective tissue.Pro-Ubisch bodies were produced and excreted out of plasmolemma of p-tapetal and some c-tapetal cells.Ubisch bodies exist on the inner surface of p-tapetal cells,but no or very few Ubisch bodies can be observed on the locule surface of these c-tapetal cells,other kind of ctapetal cells did not produce pro-Ubisch bodies and Ubisch bodies,another kind of ctapetal cells degenerated before producing pro-Ubisch bodies,P-tapetum degenerated at the original place after mitosis of microspores.Degenerative signs began to appear in ctapetal cells in different pollen sac during meiosis,tetrads or microspore stage.Most ctapetal cells degenerated earlier than p-tapetum.After loss of the radial wall and the wall facing the locule,plasmolemma of c-tapetum was broken,and the degenerating cytoplasm and organelles moved into the anther locule.