Abstract
Context
Although adventitious shoots are produced in many tree species in response to injury, little is known about the effects of salinity on sprouting.
Aims
The main objective was to examine the sprouting capacity of Pinus leiophylla seedlings in relation to injury and physiological changes induced by NaCl.
Methods
Seedlings were grown in controlled-environment growth rooms and treated with 0, 100, 150, and 200 mM NaCl. Numbers of adventitious shoots were recorded and growth and physiological parameters measured after 64 days of treatments and following a 30-day recovery period.
Results
NaCl treatments triggered sprouting of adventitious shoots, mainly in the lower parts of the stems. However, fewer sprouts were induced by 200 mM NaCl compared with the lower concentration treatments. These changes were accompanied by needle necrosis, decreased chlorophyll concentrations, seedling dry mass, and stem diameter. Stomatal conductance, net photosynthesis, and root hydraulic conductance decreased with increasing NaCl concentrations and did not return to the control levels after 30 days of stress relief.
Conclusions
Pinus leiophylla has the regeneration potential when exposed to salinity. However, very high salt concentrations induce severe physiological impairments and, consequently, a decrease of this regeneration potential.
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Acknowledgments
We thank the Natural Sciences and Engineering Research Council of Canada and the Mexican Consejo Nacional de Ciencia y Tecnologia (CONACyT) and Colegio de Postgraduados for the financial support of this study.
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Handling Editor: Erwin Dreyer
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Jimenez-Casas carried out the PhD research project and drafted the manuscript. Zwiazek co-designed and supervised the research and prepared the manuscript for submission.
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Jimenez-Casas, M., Zwiazek, J.J. Adventitious sprouting of Pinus leiophylla in response to salt stress. Annals of Forest Science 71, 811–819 (2014). https://doi.org/10.1007/s13595-014-0379-z
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DOI: https://doi.org/10.1007/s13595-014-0379-z