ISHS Acta Horticulturae 474: III International Symposium on Olive Growing
THE GROWTH RETARDANTS PACLOBUTRAZOL AND TRIAPENTHENOL AFFECT WATER RELATIONS AND INCREASE DROUGHT RESISTANCE OF OLIVE (OLEA EUROPAEA L.) |
| Authors: | F. Frakulli, D.G. Voyiatzis |
| Keywords: | olive, paclobutrazol, water relations |
| Abstract:
Two-year-old potted olive trees (Olea europaea L.), treated with paclobutrazol or triapenthenol, showed increased water potential but decreased stomatal resistance and water saturation deficit at the end of a 5-day-long dry-down period, five months after treatment. Control plants showed acute water stress symptoms such as leaf yellowing and rolling, and shoot tip bending. Development of stem secondary xylem tissue and the number of xylem vessel elements were suppressed while their diameter was not affected. Four-year-old potted olive plants, in soil kept at field capacity or subjected periodically to drought conditions (permanent wilting point), and treated with either of the two chemicals, showed a significant decrease in their daily and total water use, at both levels of soil moisture. | |
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