Effect of thidiazuron and gibberellic acid on leaf yellowing of cut stock flowers |
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Authors: | Antonio Ferrante Anna Mensuali-Sodi Giovanni Serra |
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Institution: | 1. Departament of Plant Production, Università degli Studi di Milano, 20133, Milano, Italy 2. Sant’Anna School of Advanced Studies, 56100, Pisa, Italy
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Abstract: | Plant hormones such as cytokinins and gibberellins are able to inhibit leaf yellowing in different species of cut flowers
and potted plants. These hormones can be used alone or in combination among them for preserving chlorophyll in floriculture
items. In the present study thidiazuron was tested alone or combined with GA3 for delaying leaf yellowing of cut stock flowers during vase life. Cut flowers were placed in a controlled environment and
treated for 24 hours with the following solutions: distilled water (control) or solutions containing 5, 10 μM thidiazuron
(TDZ), 0.5 mM gibberellic acid (GA3), or a combination of 0.5 mM GA3 with 5 μM TDZ. The effect of treatments was evaluated by measuring chlorophyll content, ethylene production, leaf gas exchanges
and chlorophyll a fluorescence. Results showed that TDZ was able to delay leaf yellowing in light during whole experimental
period (30 days). The effect of TDZ on dark stored flowers was less effective, and also delayed chlorophyll losses for 10–12
days. TDZ and GA3 combination did not show any synergistic nor beneficial effect. Gas exchange values such as net photosynthesis, vapour pressure
deficit, stomatal conductance and water use efficiency were higher in the TDZ only treatment. |
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