Changes in abscisic acid and flower pigments during floral senescence of petunia |
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| Authors: | A Ferrante P Vernieri F Tognoni G Serra |
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| Institution: | (1) Department of Crop Science, University of Milan, Via Celoria 2, Milan, I-20133, Italy;(2) Department of Crop Biology, University of Pisa, Pisa, I-56124, Italy;(3) Sant’Anna School of Advanced Studies, Pisa, I-56127, Italy |
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| Abstract: | The present work was focused on abscisic acid (ABA) changes in three differently coloured petunias during flower development
and senescence. The ABA content was studied in correlation with changes of flower pigments and other phytohormones. The variations
of anthocyanins and endogenous hormones were induced by treatments with 1 or 2 mM amino-oxyacetic acid (AOA), 50, 100 μM thidiazuron
(TDZ) and 50 μM 6-benzyladenine (BA). ABA content decreased during bud development and increased during senescence. The AOA
reduced the anthocyanins content and avoided ABA increase, while the cytokinins (BA and TDZ) did not significantly affected
anthocyanin contents but increased ABA content. TDZ doubled the ABA content compared to the control. However, the treatments
did not affected flower life, confirming the secondary role of ABA during flower senescence. |
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| Keywords: | anthocyanins amino-oxyacetic acid benzyladenine carotenoids cytokinins Petunia × hybrida thidiazuron |
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