The Comparative Anatomical Structural Study On Two Similar Plants Of Rosales

Paraffin-section technique,free hand section,wood maceration,epidermis maceration and light microscopy were used to study comparative anatomical structure for Prunus padus Land Prunus dauidiana(Carr.)Franch in Changchun.The results show that although these plants have similar external forms,their internal structrues are very different.Many protein grains are found in the dissection structure of leaf,leafstalk and culm of Prunus padus L..Palisade tissue in leaf,which amount to more than half of the stature of leafare always,of two layers and array closely.Many annuli constituted with numerous protein grains are observed in the spongy tissue of Prunus padus L..Numerous coat fuzz structures dirived from scarfskin are found in the leaf,leafstalk and stum in Prunus dauidiana(Carr.)Franch.The palisade tissue tends to be of one layer and arrays incompactly, and the stature is about half of that of leaf.Spongy tissue of Prunus dauidiana(Carr.)Franch arrays loosely with little contents.The timber material of Prunus padus L.can be divided into springwood with large lumens arraying barredly and summerwood with small lumens arraying barredly,but for the little differences in the caliber,it is still be diffuse porous wood.The timber configuration of Prunus dauidiana(Carr.)Franch is of typically diffuse porous wood.The rays of Prunus padus L.mostly are uniseriate rays composed with square high altitude cell,and there are little multiseriate rays,so Chouli timber is original.The amount of uniseriate rays and multiseriate rays are almost equal in cross section of Prunus dauidiana(Carr.)Franch timber, and those rays are composed of recumbent cells,and meantime the altitude of the rays become shot.Compared with configuration of vessel element of two study materials,Prunus dauidiana(Carr)Franch is only with simple perforation plates,and there are not only simple perforation plates but also a little multi-perforation plates.Vessel elements in Prunus padus L.are longer,and the draw of end wall is larger,and tends to be a long tail in one end mainly composed of pitted vessels.Vessel elements in Prunus dauidiana(Carr.)Franch, mainly composed of pitted vessels,are shorter and the draw of end wall is smaller.A conclusion can be drawn from above discussion that the evolution direction of the two similar plants is from original Prunus padus L.to evolutive Prunus dauidiana (Carr.)Franch.