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Nitrogen regulates CRY1 phosphorylation and circadian clock input pathways
Yang-Hong Zhou1, Zhong-Wei Zhang1, Chong Zheng2
1a College of Resources Science and Technology , Sichuan Agricultural University , Chengdu , China.
Plant Signaling & Behavior
|September 13, 2016
Summary
Low nitrogen fertilizer delays flowering by altering energy levels, affecting CRY1 protein activity and its role in the plant
Area of Science:
- Plant molecular biology
- Nutrient signaling pathways
- Circadian clock regulation
Background:
- Nitrogen (N) fertilizer's impact on plant flowering is well-documented.
- The precise molecular mechanisms underlying N-induced flowering delay remain largely unknown.
Purpose of the Study:
- To elucidate the molecular pathway connecting nitrogen availability to flowering time.
- To investigate the role of CRY1 protein in nitrogen signaling to the circadian clock.
Main Methods:
- Analysis of energy charge ratios (NADPH/NADP+, ATP/AMP).
- Assessment of adenosine monophosphate-activated protein kinase (AMPK) activity and CRY1 protein phosphorylation/abundance.
- Exploration of CRY1's function in the nitrogen signal input pathway to the circadian clock.
Main Results:
- Low nitrogen conditions elevate NADPH/NADP+ and ATP/AMP ratios.
- These changes modulate AMPK activity, influencing CRY1 phosphorylation and abundance.
- CRY1 functions as a key component in transmitting nitrogen signals to the plant's circadian clock.
Conclusions:
- A novel molecular mechanism linking nitrogen status to flowering time via the CRY1 protein and circadian clock is identified.
- Further discussion encompasses the C/N ratio's role in flowering, AMPK oscillation, conserved CRY1 regulation, and nitrogen-NO signal crosstalk.
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