Author : Oria, Demetrio V.

Summary : 'Carabao' mango scion was cleft grafted to six rootstock cultivars ('Aroomanis', 'Carabao', 'Kurashigue', 'Pico' 'Sandersha Green' and 'Valencia Pride') to evaluate congeniality through graft union development, growth, nutrient content, and phytohormone levels. Callus was already formed in the cambial zone of the six rootstocks 8 days after grafting (DAG). Cells from the rootstock filled the gap between the graft components. These cells intermingled with cells emanating from the scion 12 DAG. Cambial arch differentiation occurred 24 DAG in 'Carabao', 'Sandersha Green' and 'Valencia Pride' rootstocks which preceded new cambium layer formation. Secondary phloem and xylem tissues were apparent one month after grafting in all of the rootstocks. Wound healing process began about this period leading to a congenial graft union development on all rootstocks used. Dry matter and other growth parameters increased with time. Leaf and stem dry weights, stem diameter and length, and number of leaves of scion were strongly and positively correlated with total scion dry weight. Growth of 'Carabao' mango scion was greatest on 'Sandersha Green' rootstock. Scion growth in other rootstocks was comparable to that on 'Carabao' rootstock.