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Hormonal control of flower petal senescence



Hormonal control of flower petal senescence



DOGA Bilim Dergisi Seri A Temel Bilimler 6(3): 39-48



IAA, ABA (abscisic acid), gibberellins and cytokinins were extracted from the petals of Impatiens sultani flowers at 4 stages of flower development and senescence. Spectrophotometry and bioassay methods showed that ABA content increased along with the progress of senescence. The methods employed were inadequate to indicate modifications, if any, in IAA levels. GA and cytokinin levels increased during the transformation of the bud into flower and anthesis, and later decreased after stamen abscission. Externally applied IAA to cut carnation flowers, probably by inducing ethylene synthesis, hastened senescence, whereas it was delayed by kinetin (5-furfurylamino purine) treatment. GA3 application apparently did not have any effect. The close relationship between petal senescence and internal hormonal balance is emphasized.

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Accession: 001085519

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