Endogenous Bio-Chemical Changes Vis-a-Vis Node Positions on one Year Old Shoot in Teak (Tectona grandis L.F.)

Endogenous contents of moisture, soluble sugars phenols and o-phenols as well as peroxidase activity at ischolar_maining zone of successive N_1-10 nodes from top to bottom collected from one year growth of a 5-6 year old teak (Tectona grandis L.f.) bud grafts maintained in vegetative multiplication garden were estimated. No set trend in endogenous bio-chemical parameters suggests that they play active physiological role in differentiation/ growth of shoot appendages and also adventitious ischolar_mains in excised shoots. Their minimum endogenous levels at N₁ and N₂ may be due to their involvement in extension growth of twigs and leaf expansion related metabolic process, making their limited availability for de novo adventitious ischolar_mains. Thus, the above preliminary biochemical investigations carried out at various nodes of the same shoot may, to some extent, help explain their differential ischolar_maining response besides encouraging in depth exploration to find out biochemical basis of progressive loss of juvenility and ischolar_maining potential with the aging of perennial trees.