Abstract
Cotyledons ofPhaseolus vulgaris L. contain small amounts of phaseollin and kievitone. Isolating the cotyledons from the plant does not alter phaseollin levels. Kievitone levels, however, although not affected in light-incubated cotyledons, increased rapidly in dark-incubated cotyledons. Abscisic acid (ABA) at 10-4 M stimulated the accumulation of phaseollin in excised cotyledons in both light and darkness, whereas benzylaminopurine (BAP) increased these levels only in the light. The kievitone level was influenced by ABA and BAP only in dark-incubated cotyledons, i.e., inhibited at 10-4 M. When excised cotyledons were treated with mercuric chloride, both phaseollin and kievitone accumulated rapidly in both light and darkness. The effect of ABA on these cotyledons was similar to that on non-treated cotyledons. The results demonstrate that the synthesis of the two phytoalexins is regulated by separate mechanisms and indicate that the phytoalexin composition is dependent on the physiological condition of the cotyledons. ABA and BAP may play a role in the resistance response of the plant.
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Abbreviations
- ABA:
-
abscisic acid
- BAP:
-
benzylaminopurine
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Goossens, J.F.V., Vendrig, J.C. Effects of abscisic acid, cytokinins, and light on isoflavonoid phytoalexin accumulation inPhaseolus vulgaris L.. Planta 154, 441–446 (1982). https://doi.org/10.1007/BF01267811
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DOI: https://doi.org/10.1007/BF01267811