Change of Endogenous IAA During Cambial Activity and IAA-binding Protein in Cambial Cells in Broussonetia papyrifera Change in the Concentration and Tissuelocalization of Endogenous IAA During the Regeneration of Vascular Tissues After Xylem Removal in Broussonetia papyrifera Effect of Pentefezol on the Endogenous IAA Content in Rice Seedlings STUDIES ON ENDOGENOUS HORMONE LEVELS IN CUTTINGS OF THREE POPLAR SPECIES DURING ROOTING PROCESS PHYSIOLOGICAL EFFECTS OF ENDOGENOUS IAA ON GRAIN FILLING OF HYBRID RICE XIEYOU 9308