Ultrastructural features of pollen tubes of Endymion non-scriptus modified by cytochalasin D

摘要: The cytochalasins, known as inhibitors of various processes involving motility in plant and animal cells, induce far-reaching structural changes the cytoplasm walls pollen tubes without destroying capacity for subsequent growth normal media. fine structure Endymion non-scriptus modified by cytochalasin D suggests that all stem directly or indirectly from interruption longrange cyclosis along tube axis, which is sustained throughout period growth. elimination this movement breaks down pattern flow responsible sorting-out process maintains characteristic zonation organelles other inclusions at apex extending tube, leads gradually to re-distribution vacuoles membranes vegetative cell, disposition normally correlated with longitudinally oriented pathways. Random local migrations greater amplitude than be expected Brownian continue presence D, indicating system not wholly destroyed. Following concerted axial movement, polysaccharide wall-precursor bodies (P-particles), inserted into wall mainly apical part during tip growth, become dispersed are incorporated random, entering even intine parent grain.