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Updated: Apr 28, 2026

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Published on: January 20, 2023
Zeatin modulates flower bud development and tocopherol levels in Cistus albidus (L.) plants as they age
I Hernández1, J A Miret, K Van Der Kelen
1Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain.
Abstract:
In a previous study we showed that Cistus albidus (L.) experiences an age-dependent decay in flower vigour correlated with a decline in trans-zeatin (tZ) levels. In the present study we aimed to establish a causal relationship between these two phenomena. Exogenous tZ applied to plants grown under semi-controlled conditions did not rescue flower vigour; however, it accelerated flower development, but only in younger individuals. Older plants showed lower tocopherol levels in flower buds, which were restored by exogenous tZ, suggesting that a loss of antioxidant defences may underlie the age-dependent decay in flower vigour. We conclude that declining tZ levels may not be directly responsible for the age-associated loss of floral vigour; that tZ modulates the speed of flower development as plants age; and that flower buds alter their sensitivity to tZ as plants age.
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