Articles
INFLUENCE OF ROOT ZONE TEMPERATURE AND PULSE TREATMENT OF GIBBERELLIC ACID (GA3) ON APPLE SEEDLING GROWTH AND DEVELOPMENT
Article number
363_14
Pages
109 – 114
Language
Abstract
Pulse treatments of 2 ppm gibberellic acid (GA3) applied in a full nutrient solution to apple seedlings growing in sand and held at four different root-zone temperatures (10, 13, 16 or 19°C) reduced root growth at the two highest temperatures but had no effect on shoot growth and development at any temperature.
The effects of increasing root-zone temperature on shoot elongation, leaf dry weight and leaf area were linear up to 19°C suggesting that the optimum temperature was several degrees higher.
However, root surface area, root dry weight, stem dry weight and leaf number were approaching their highest value at 19°C. These results are discussed in relation to the development of techniques to promote early season growth of fruit trees where soil temperatures may be well below optimal.
The effects of increasing root-zone temperature on shoot elongation, leaf dry weight and leaf area were linear up to 19°C suggesting that the optimum temperature was several degrees higher.
However, root surface area, root dry weight, stem dry weight and leaf number were approaching their highest value at 19°C. These results are discussed in relation to the development of techniques to promote early season growth of fruit trees where soil temperatures may be well below optimal.
Publication
Authors
N.E. Looney, D.J. Thompson, L.J. Veto
Keywords
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