Author : Javier, Flordeliza B.

Summary : The morpho-anatomical development during graft healing and union in pili (Canarium ovatum Engl.) was investigated. Four major events were observed weekly for four weeks in patch budding and monthly for four months in inarching. Apparent union was attained at Event 3 where differentiation of the cambiform arcs or cambial connections occurred. Graft healing and union in pili seemed to belong to the category of cell differentiation involving cambial connections. Whether differentiation of callus mass in the wood area to new vascular elements in inarching occurred very late in the development was not known. Limitation was due to time constraint. Stem growth was apparent in inarching as revealed by the constriction developed at union secured by the plastic strip. Chemical components of the leaf, stem, and root of the inarched plants were analyzed following the developmental events. Significant decrease and increase in the chemical components (N and starch contents) of the organs sustained the processes of graft healing and union. The decrease in the chemical components in the leaf and root might be due to degradation and translocation to the stem. The increase in the chemical components of the organs seemed to show synthesis which was occurred when graft union was attained for successfully inarched plants. A similar trend was shown for total auxin-like activity but the decrease and increase were insignificant. High correlation was revealed by the chemical components of the scion and stock at grafting time with percent success.