Altered dry matter partitioning of 'Starkspur Supreme Delicious' apple trees by nine rootstocks

The dry matter partitioning to vegetative and reproductive components of 'S tarkspur Supreme Delicious' apple (Malus domestica Borkh.) on nine rootstoc ks in the 1980-81 NC140 Apple Rootstock Trial was determined in March. and again in Oct.-Nov. 1990. Trees on MAC.24 and M.7 EMLA had the heaviest tota l tree dry weight (DW), while M.26 EMLA was intermediate. Trees on OAR 1, O .3, M.9 EMLA, MAC.9, and M.9 did not differ, and M.27 EMLA had the least to tal DW. Total tree DW was correlated negatively with percent of fruit, spur , and spur leaf DW and was correlated positively with the percentage of fra me, 2-yr and 1-yr wood, current season's growth, and shoot leaf DW.