Anatomical Studies on the Vegetative Organs and the Stored Root of Different Years of Phytolacca Acinosa

Observing the anatomic structure of Phytolacca acinosa's root,stem,leaf and stored root of different years,by using paraffin sectioning and the methed of digital photograph.The results shows Phytolacca acinosa's primary xylem is tetrarch.The young root's secondary structure is normal.There are unusual secondary growth in root and stem.Parenchyma of the tertiary structure is very rich,have little vascular bundle Roots of different years have different content of starch grain.For example,content of two-year-root content is the least,three-year-root has litter content too,content of four-year-root and six-year-root is plentiful,Starch grain stored in phelloderm and parenchyma.There is no starch grain in supernumerary cambium.Roots are different in the width of supernumerary cambium and phelloderm and the cell.there is big space among mesophyll cell.