Comparison of phenolic content of 'liberty' apple (Malus X domestica) on various rootstocks
2004
García, E. | Rom, C.R. | Murphy, J.B.
Phenolic compounds are secondary metabolites produced by most members of the plant kingdom and are a major part of the chemical component of plants. The distribution of these metabolites varies among the different taxonomic groups, during the ontogeny of the individual, and the type of tissue. These compounds have been associated with plant defense mechanisms. However, the role of these compounds in apple defense mechanisms is not definitive. The phenolic content of apple has been shown to vary according to cultivar, rootstock, organ, ontogeny, and cultural practices. Quantifying the phenolic content in Malus germplasm is the first step in understanding their role in plant defenses and how these compounds may be used as a management strategy for fruit growers. The objective of this study was to determine, by spectrophotometric technique, the foliar polyhydroxylated phenolic content of four-year-old 'Liberty' apple (Malus X domestica Borkh) grafted onto various rootstocks (G.11, M.9, M.26, M.7, CG 5005, G.30, MM.106, MM.111, and Pearleaf) at three times during the growing season (May, June, and July). These trees were part of the national 1992 NC-140 Cornell/Geneva rootstock trial located at the University of Arkansas, Fayetteville, AR., USA. There were significant differences in the foliar phenolic content of the scion among the rootstocks. 'Liberty' on M.7 and MM.111 had the highest mean polyhydroxylated phenolic content, whereas 'Liberty'/CG.5005 had the lowest mean phenolic content. There was no specific pattern of increase or decrease of phenolic content through time per rootstock.
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