Taxonomic Significance of Venation Pattern and Stoma Morphology Characters in Four Species of Cinnamomum Trew
In order to explore the significance of venation characteristics of Cinnamum glanduliferum,Cinnamum ja-ponicum,Cinnamum camphora and Cinnamum longipaniculatum as well as stomatal characteristics in plant classi-fication and evolution.The venation specimens of leaf veins were made by the venation method.In addition,the num-ber of stomata,the length of long axis and short axis,the morphology of guard cells,the number of mesh and the size of mesh were observed,counted and analyzed by the Mingmei micro imaging system.The results showed that:The leaves of C.japonicum were of long elliptic type,and the veins of the leaves were obviously off base three outgoing veins.The leaves of C.glanduli ferum,C.camphora and C.longipaniculatum were of wide elliptic type,with pinnate veins.The mesh and leaf of C.glanduliferum are the largest,and the secondary veins are arranged unevenly,with 4～5 on each side;C.camphora has the smallest mesh,the longest petiole and 2～3 secondary veins on each side.The number of stomata is the most in C.japonicum,the stomata shape is long oval,and the guard cell shape is kid-ney like and equal thick walled.The number of stomata of C.glanduliferum,C.camphora and C.longipaniculatum is similar,the shape of stomata is nearly round,and the shape of guard cells belongs to ship type.The ratio of long axis to short axis of C.japonicum is the largest,which is 1.8.The ratio of long axis to short axis of C.glanduliferum is the smallest,which is 1.1.Generally speaking,the vein type,vein sequence,mesh and stoma of Cinnamomum Trew leaves are relatively stable characters,which can be used as a basis for effective classification.In addition,the leaf shape,venation and stomatal characteristics of the four species have little difference,and there is no more parallel and reverse evolution.It can be preliminarily explained that the evolution route among the characters of Cinnamomum Trew is relatively single,and the evolution status of the four species is similar.The morphological and anatomical characteristics of leaves support that the four species belong to the same genus.
国家科技期刊平台
NSTL
万方数据
