Dry Matter Partitioning in ‘Starkspur Supreme Delicious’ on Nine Rootstocks
DOI:
https://doi.org/10.71318/apom.1991.45.4.238Keywords:
Malusx domestica, harvest indexAbstract
The dry matter partitioning to vegetative and reproductive components of ‘Starkspur Supreme’ on 9 rootstocks in the 1980-81 NC-140 apple rootstock trials was determined in 1990. Trees on MAC.24 and M.7 EMLA had the heaviest aboveground dry weight and the lowest harvest index (HI); M.26 EMLA trees were intermediate for both. ‘Starkspur Supreme’ on OAR 1, O.3, M.9 EMLA, M.9, MAC.9, and M.27 EMLA accumulated the least dry matter and had the highest HI’s. Total aboveground dry weight in March ranged from 40.8 kg for MAC.24 to 1.5 kg for M.27 EMLA. HI’s ranged from a high of 0.55 for M.27 EMLA to 0.36 for MAC.24. Trees with less aboveground dry weight partitioned a higher percentage of their total to spurs and spur leaves. The percent of spur dry weights ranged from 8.1 for M.27 EMLA to 2.1 for MAC.24. Spur leaf dry weight percentages ranged from 6.0 for M.27 EMLA to 2.7 for MAC.24.
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