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Effect of paclobutrazol on accumulation of organic acids and total phenols in apple wood

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Abstract

Apple trees (Malus domestica Borkh “Spartan” grafted on MM 106 rootstock) planted in 1976 in an orchard at Beltsville, Maryland, were treated with paclobutrazol (2RS,3RS)-1-(4-chlorophenyl)-4,4-dimethyl-2-1,2,4-triazol-1-yl-pentan-3-ol) using a foliage spray in 1982 and by trunk banding in 1983. Paclobutrazol did not inhibit shoot growth in 1983; however, shoot growth was significantly retarded in 1984. Increases in organic acids, including succinic, malic, citric, and quinic, and also in total phenols, occurred in wood produced in 1983 on paclobutrazol-treated trees when growth was not inhibited and in wood produced in 1984 when growth was inhibited. The organic acid content of both paclobutrazol-treated and untreated wood tended to decrease from the winter dormant period through growth resumption in the spring. However, the content of total phenols remained nearly the same throughout this sampling period.

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Authors and Affiliations

  1. Fruit Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, U.S. Department of Agriculture, 20705, Beltsville, Maryland, USA

    S. Y. Wang & G. L. Steffens

Authors
  1. S. Y. Wang
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  2. G. L. Steffens
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Mention of a trademark, proprietary product or vendor does not constitute a guarantee or warranty of the product by the U.S. Department of Agriculture and does not imply its approval to the exclusion of other products that may also be suitable.

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Wang, S.Y., Steffens, G.L. Effect of paclobutrazol on accumulation of organic acids and total phenols in apple wood. J Plant Growth Regul 6, 209–213 (1987). https://doi.org/10.1007/BF02102549

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  • DOI: https://doi.org/10.1007/BF02102549

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