ISHS Acta Horticulturae 179: V International Symposium on Growth Regulators in Fruit Production
EFFECTS OF SOME PLANT GROWTH REGULATORS ON WATER USE AND THE UPTAKE OF MINERAL NUTRIENTS BY TREE CROPS |
| Author: | D. Atkinson |
| Abstract:
The direct and indirect effects of plant growth regulators (PGRs) on mineral nutrition and water use are reviewed, with particular attention to the effects of paclobutrazol on tree crops. Paclobutrazol and other retardants reduce water consumption as a result of effects on leaf area. Stomatal conductivity is often reduced and, as a result, especially where plants are under stress, water potential is increased. Under field conditions effects seem likely to be smaller than for experiments in pots. In intensive systems paclobutrazol may reduce root length and density and hence the use of soil resources. Effects of retardants on nutrient concentrations are usually smaller than those on growth. | |
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