A quantitative investigation of symplasmic transport inChara corallina. I. Ultrastructure of the nodal complex cell walls

摘要

We present a quantitative ultrastructural study of the size and frequency (density distribution) of plasmodesmata in the cell wall in common between the internodal cell and peripheral cell (and central cell) ofChara corallina. In the wall in common between the central cell and internodal cell the relative area occupied by plasmodesmata is 15.3; the pore diameter (less the plasmalemma) is 118ensp;nm; the length is 1.54ensp;mu;m, and the frequency is 1.4ensp;times;ensp;109ensp;pores/cm2. In the wall in common between the peripheral cell and internodal cell the relative area occupied by the plasmodesmata is 9.6; the pore diameter is 100ensp;nm; the length is 1.07ensp;mu;m; and the frequency is 1.2ensp;times;ensp;109ensp;pores/cm2. The plasmodesmata have an anastomosing structure likeNitella translucensbut the pore diameter and frequency are much greater.