Abstract
We carried out a circadian characterization of non-structural carbohydrate dynamics in the different organs of Erythrina velutina seedlings at late establishment. Seeds were incubated under controlled conditions for 9 days and then seedlings were hydroponically grown in a greenhouse for 8 days. Carbon dioxide uptake was measured in the cordiform leaves every 2 h during the daytime (12 h) and every 4 h during the night-time (12 h); seedlings were harvested every 4 h during the day-night cycle (24 h) to assess the contents of non-structural carbohydrates and the activities of amylases and invertases. Diel patterns of non-structural carbohydrate content were identified in the photosynthetic organs, in which the turnover of starch operated far from its depletion at dawn. In the heterotrophic organs, however, changes in the starch content over 24 h may have maintained the supply of soluble sugars, buffering transient fluctuations in carbon availability. Although it seems that amylase activity was not influenced by the circadian rhythm in the different seedling organs, diel patterns of invertase activity were recognized in the photosynthetic organs.
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Abbreviations
- AINV:
-
Acid invertases
- DW:
-
Dry weight
- DNS:
-
3,5-Dinitrosalicylic acid
- NINV:
-
Neutral invertases
- NRS:
-
Non-reducing sugars
- NSC:
-
Non-structural carbohydrates
- PPFD:
-
Photosynthetic photon flux density
- RS:
-
Reducing sugars
- TSS:
-
Total soluble sugars
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Acknowledgements
The authors thank to Universidade Federal do Rio Grande do Norte for supporting the research and Dr. Juliana Espada Lichston as she kindly provided the infrared gas analyser for the CO2 uptake measurements.
Funding
This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (fellowship granted to Maryelle Campos-Silva) and Universidade Federal do Rio Grande do Norte (fellowship granted to Herley Carlos Bezerra-de-Oliveira).
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ELV and DFAO conceived and designed the experiment; MCS, HCBO, JDFF, and TMF carried out the experiment and made CO2 uptake measurements, seedling harvests, and NSC quantification; MCS and DFAO carried out enzyme assays, calculated NSC contents and enzyme activities, and performed statistical analysis; ELV, MCS, and DFAO wrote the manuscript.
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Campos-Silva, M., Alves-de-Oliveira, D.F., Bezerra-de-Oliveira, H.C. et al. Circadian characterization of non-structural carbohydrate dynamics in the Caatinga pioneer tree Erythrina velutina during late seedling establishment. New Forests (2023). https://doi.org/10.1007/s11056-023-10017-7
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DOI: https://doi.org/10.1007/s11056-023-10017-7