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Cyclic GMP stimulates flower induction of Pharbitis nil via its influence on cGMP regulated protein kinase

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Abstract

It was revealed that cGMP is involved in the control of photoperiodic flower induction. Further insight into the signalling function of cGMP is likely to be obtained by analysis of its effectors. Therefore, in the present study, we used various agents that cause changes in cGMP-dependent kinase (PKG) activity and examined their effects on the activity of kinase isolated from Pharbitis nil and flower induction. It was found that exogenous applications of PKG activators (cGMP, 8-pCPT-cGMP, 8-Br-cGMP, 8-pCPT-PET-cGMP) to cotyledons which were exposed to a 12-h-long subinductive night significantly increased flowering response. From among the many antagonists of cGMP-dependent protein kinase Rp-8-Br-PET-cGMPS, Rp-8-pCPT-cGMP and the synthetic heptapeptide inhibitor of PKG were used for our analysis. When Rp-8-Br-PET-cGMPS and Rp-8-pCPT-cGMP were applied during a 16-h-long inductive night, significant reduction in the number of flower buds was observed, whereas synthetic heptapeptide did not change the intensity of flowering. The influence of the analysed chemicals on protein kinase activity was also examined in vitro. With the exception of synthetic heptapeptide, which seems ineffective, the enzyme activity was stimulated by all agonists and significantly reduced by all antagonists. The activity of protein kinase was assayed in P. nil soluble protein fractions from plants grown under flower-inducing and non-inducing conditions. In vitro phosphorylation was slightly greater in the soluble fraction obtained from plants grown under the flower-inducing condition, reaching 1.05 nmol/min/mg protein, when compared to the control 0.81 nmol/min/mg protein. In relation to the results described above, we can conclude that cGMP as a mediator participating in photoperiodic flower induction may govern this process by the phosphorylation mechanism via its influence on cGMP-dependent protein kinase activity.

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Authors and Affiliations

  1. Department of Physiology and Molecular Biology of Plants, Institute of General and Molecular Biology, Nicolaus Copernicus University, Gagarina St. 9, 87-100, Torun, Poland

    Adriana Szmidt-Jaworska, Krzysztof Jaworski & Jan Kopcewicz

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  1. Adriana Szmidt-Jaworska
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  2. Krzysztof Jaworski
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  3. Jan Kopcewicz
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Correspondence to Adriana Szmidt-Jaworska.

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Szmidt-Jaworska, A., Jaworski, K. & Kopcewicz, J. Cyclic GMP stimulates flower induction of Pharbitis nil via its influence on cGMP regulated protein kinase. Plant Growth Regul 57, 115–126 (2009). https://doi.org/10.1007/s10725-008-9326-z

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  • DOI: https://doi.org/10.1007/s10725-008-9326-z

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