鹅掌楸油细胞的发育解剖学研究

Studies on the development of oil cells in Liriodendron chinense

鹅掌楸油细胞比相邻组织细胞分化早 ,因而在叶肉细胞未完全分化的叶原基、幼叶以及未完全分化的幼茎中 ,都可看到已分化的油细胞。通常 ,在第二叶原基中可发现油细胞原始细胞 ,由于其染色深、细胞核大而易与周围组织的细胞相区别。以后 ,油细胞逐步液泡化 ,直至形成一个大的液泡 ,此时 ,细胞核呈扁平状 ,并与细胞质一起成为一薄层围绕着大液泡。当油细胞发育成熟后 ,细胞质及核开始解体 ,整个油细胞的腔由大液泡充满 ,成为油囊。在部分细胞中 ,可观察到杯形构造 ,但没有发现溶生油细胞腔的结构。

The oil cells in Liriodendron chinense differentiated earlier than the neighboring cells.Very young leaf and stem show fully developed secretory oil cells among poorly differentiated cells.The first recognizable stage was seen in the second primordia.The oil cell initial contains a large nucleus and densly cytoplasm,for which it is easy to identify it.Then,the oil cell begins to vacualize until a large vacuole is formed,therefore,the nucleus becomes flattened and is crushed between the oil cell wall and the large vacuole as a thin layer together with the reminant cytoplasm.After it reaches its maturity,the whole volume of the oil cell is filled with the large vacuole,which becomes the oil sac subsequently.In some oil cells,the cupule can be observed,but the occurance of lysis cavaties from oil cells reported by the other authors is not found.