论文部分内容阅读
对不同生长时期的烟草叶片叶肉细胞超微结构进行了观察研究。结果表明,成熟叶肉细胞细胞器丰富,有8～9个周壁叶绿体,为巨大的长椭圆形,基粒片层清晰,有淀粉粒,少量脂滴。衰老后叶肉细胞叶绿体由长椭圆形趋于圆形,基粒片层逐渐变得杂乱至模糊不清。不同成熟度叶片超微结构变化明显,主要表现在叶绿体片层结构整齐程度、线粒体个数和嵴数以及细胞核核液浓度上。
The ultrastructure of mesophyll cells in tobacco leaves at different growth stages were observed and studied. The results showed that the mature mesophyll cells were rich in organelles, with 8-9 peripheral wall chloroplasts, large oval, clear grana lamellae, starch granules and a few lipid droplets. After aging, the chloroplasts of the mesophyll tend to be round in shape of long oval, and the glabrous layer gradually becomes messy and blurred. The ultrastructural changes of leaves at different maturity were obvious, which were mainly manifested in the regularity of the chloroplast lamella structure, the number of mitochondria, the number of crest and the concentration of nucleus fluid.