ISHS Acta Horticulturae 669: VIII International Symposium on Postharvest Physiology of Ornamental Plants
RETARDATION OF TULIP SHOOT SENESCENCE BY AUXIN |
| Authors: | L. Kawa-Miszczak, E. Wegrzynowicz-Lesiak, M. Saniewski |
| Keywords: | chlorophyll, abscisic acid (ABA), ethephon, benzyladenine (BA) |
| Abstract:
In our studies we found that application of indole-3-acetic acid (IAA) at a concentration of 0.1, 1.0 and 2.0% in lanolin paste in the place of removed flower bud at the beginning of flowering of tulips, in the presence of leaves or after excision of all leaves, greatly retarded the chlorophyll degradation and delayed both stem and leaves senescence. The interaction of auxin with ethephon (ethylene), abscisic acid (ABA) and benzyladenine (BA) on tulip stem and leaves senescence was also studied. At the beginning of flowering IAA was applied in lanolin paste in the place of removed flower, and water, ethephon, ABA or BA were applied to the second leaf sheath using a soaked cotton wick. It was found, on the basis of morphological observation and chlorophyll changes, that senescence occurred at first in tulips treated with ABA, followed by ethephon and water. Senescence processes stimulated by ABA and ethephon were greatly delayed after application of IAA. BA applied alone delayed senescence of plant. In all experiments auxin retarded the chlorophyll degradation and high concentrations of IAA (1.0 or 2.0%) were more effective, even 34 days after treatment stems were still stiff and green. From our results it is clear that auxin, IAA, applied exogenously, is an important anti-senescence factor of tulip shoot. | |
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