Abstract
Context
In response to waterlogging, pedunculate oak is known to develop adventitious roots and hypertrophied lenticels. However, to date, a link between these adaptations and the ability to maintain net CO2 assimilation rates and growth has not been demonstrated.
Aims
The aim of this study was to explore the cause–effect relationship between the ability to form morphological adaptations (hypertrophied lenticels and adventitious roots) and the capacity to maintain high assimilation rate and growth.
Methods
The occurrence of morphological adaptations and the parameters of photosynthesis were monitored over 20 days of waterlogging in 5-week-old pedunculate oak seedlings presenting similar morphological development.
Results
Based on the development or not of morphological adaptations, the following three categories of responses were identified: development of hypertrophied lenticels and adventitious roots, development of hypertrophied lenticels alone, and the lack of development of adaptive structures. These categories, ranked in the order given, corresponded to decreasing levels of initial net CO2 assimilation rate growth and photosynthesis parameters observed during waterlogging.
Conclusion
We observed a two-way cause–effect relationship between the capacity to form adaptive structures and the assimilation rate. Indeed, the initial assimilation rate determined the occurrence of hypertrophied lenticels and growth during stress, and then the development of morphological adaptations enhanced the ability to maintain assimilation levels during the stress.
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Acknowledgments
We are grateful to the anonymous reviewers of the manuscript for their helpful comments.
Funding
This work was supported by the University of Franche-Comté and the regional council of Franche-Comté.
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Handling Editor: Erwin Dreyer
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Fabienne Tatin-Froux and Julien Parelle contributed to the entire study, and Nicolas Capelli contributed to writing the manuscript
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Tatin-Froux, F., Capelli, N. & Parelle, J. Cause–effect relationship among morphological adaptations, growth, and gas exchange response of pedunculate oak seedlings to waterlogging. Annals of Forest Science 71, 363–369 (2014). https://doi.org/10.1007/s13595-013-0340-6
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DOI: https://doi.org/10.1007/s13595-013-0340-6