【摘要】 月季的营养苗端具有两层原套细胞。苗端的原分生组织由原套、原体和叶原基组成。在原分生组织中心部位原套、原体的电镜观察中,见到有不少的粗面内质网、线粒体、质体等细胞器,但在叶原座部位原套、原体的电镜观察中,粗面内质网、线粒体和质体等细胞器的数量更多。由原分生组织衍生的初生分生组织,细胞开始液泡化,但有丝分裂频率仍很高,它由原表皮、基本分生组织、叶肉分生组织和原形成层所组成。除中心部位的基本分生组织外,所有的初生分生组织均富含粗面内质网、线粒体和质体等细胞器,唯有中心部位的基本分生组织由于开始液泡化、细胞质和细胞器所占比例较少,因此,叶原座的原套、原体和除中心部位基本分生组织以外的所有初生分生组织均具较高的有丝分裂频率,成为苗端细胞分裂旺盛的外围区,处于顶部中心的原套、原体和中心部位的基本分生组织有丝分裂频率较低,共同形成了月季营养苗端有丝分裂相对较低的区域。更多还原

【Abstract】 The vegetative shoot apex in Rosa chinensis Jacq. has two layers of tunica cells. The promeristem in the shoot apex consists of tunica, corpus and leaf primordium. Observing tunica and corpus in the promeristem center under an electron microscope, there were seen many rough endoplasmic reticulums, mitochondria and plastids which even more in tunica and corpus within the leaf buttress. The primary meristem, in which the vacuolization of cell begins and the mitosis being still frequent, is derived from the promeristem. It consists of the protoderm, fundamental meristem, mesophyll meristem and protocambium. All the primary meristems, except the centric fundamental meristem, contain a large amount of rough endoplasmic reticulum and other cell organs. The ratio of the cytoplasm is low due to the high vacuolization of the cell in the centric fundamental meristem. Therefore, the tunica and corpus of the leaf buttress and all the primary meristems with higher mitosis frequency form the vigorous zone while those of the centric promeristem and fundamental meristem with lower mitosis form the quiescent zone in the shoot apex.更多还原