Location: Plant Genetic Resources Unit (PGRU)
Title: Effects of size-controlling rootstocks on apple fruit production, quality, leaf mineral nutrients, and ethylene over several yearsAuthor
FALLAHI, ESMAEIL - University Of Idaho | |
KEISTER, MICHAEL - University Of Idaho | |
Fazio, Gennaro | |
FALLAHI, BAHAR - University Of Idaho |
Submitted to: Acta horticulturae
Publication Type: Peer Reviewed Journal Publication Acceptance Date: 12/3/2024 Publication Date: N/A Citation: N/A Interpretive Summary: The Intermountain Region of the U.S. features unique pedo-climatic fruit growing conditions which can affect the behavior of apple rootstocks regarding to productivity and nutrient uptake. This report highlights the performance of 'Aztec Fuji' scion on 30 different apple rootstocks identifying major effects on fruit quality and nutrient uptake. This research reinforces the importance of data driven rootstock choice according to local pedo-climatic conditions in the decision phase of planting a new apple orchard. Technical Abstract: Effects of rootstocks on apple (Malus × domestica ‘Aztec Fuji’) tree yield and fruit quality attributes at harvest over 2012-2015, on leaf minerals over 2012-2014, and on fruit evolved ethylene in 2020, under conditions of the Intermountain West region of the United States was studied. Cumulative yield in trees on G.484, CG.3001, G.935N, and CG.5222 were higher, while those PiAu9-90, B.71-7-22, G.2034, and CG.4003 were lower than trees on other rootstocks. On average, trees on CG.3001, G.484, CG.5222, G.41N, G.41TC, and B.70-20-20 had larger fruit while those on B.7-20-21, CG.4003 and PiAu9-90 had smaller fruit. Fruit from trees on B.7-20-21 had the highest soluble solids concentration (SSC) and firmness, but those on B.70-20-20 were among trees with lower color, SSC and firmness. Fruits on G.41TC, G.935N, G.935TC, and Supp.3 had more advanced starch degradation (SDP) while those on CG.5087, PiAu 9-90, PiAu-51-11 had lower SDP. On average, trees on B.7-20-21, G.11, and G.41N had higher leaf N but those on CG.2034, PiAu9-99, and Supp. 3 had lower leaf N. Trees on B. 64-194, B. 70-20-20, and B. 67-5-32 had higher leaf K but those on G.935T, G.935N, G.4003, and B. 9 had lower leaf K. ‘Fuji’ trees on M.26 EMLA had high leaf Ca, Mg, and MN while those on PiAu 9-99 were among trees with lower leaf Ca and Mg. Fruit ethylene in trees on Supp.3, G.3001, and G.202 were in the high-range but those on G.484, G.41, and B.9 were in the mid-range and those on M.9Pajam2, M.26EMLA, and G.11 were in the low-range. Overall, for ‘Aztec Fuji’ apple, G.484 rootstock was a superior rootstock due its induction of larger fruit size and yield and lower fruit bitter pit. |