Abstract
Resprouting is an almost universal functional trait in temperate angiosperms and confers persistence at an individual level after the loss of above-ground biomass. The importance of genetic versus environmental sources of intraspecific variation in resprouting traits is largely unknown. We conducted two genetic field trials, 400 m apart in altitude, in order to sequentially assess seedling resprouting in four environmentally contrasting Argentinean populations of Nothofagus obliqua Mirb. (Oerst). We also performed one nursery test to determine whether populations differed in early root/shoot biomass partition, a key trade-off affecting resprouting. Initial resprouting vigour and final survival were higher in our warmer test site, located 300 m below the core range of the species. The main contrasts between populations were found for pre-clipping seedling size and resprouting profusion, the latter trait showing a clear trade-off with resprouting vigour. Site × population interactions were due mainly to the behaviour of the highest altitude population, suggesting its divergent adaptive trajectory and higher plasticity for resprouting traits. Within populations, trait heritability was low, in general. Episodic frost, which may limit resprouting vigour and final success, had a lower incidence in the altitudinal and xeric limit populations. Overall, our work revealed genetic variation between populations of N. obliqua in traits that determine the success of seedling resprouting, probably associated with divergent selection. Low trait heritability suggests limited in situ micro-evolutionary capacities for resprouting traits under ongoing climate warming; phenotypic plasticity may play an important role in population persistence at the low positions of the elevation gradients N. obliqua currently inhabits.
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Notes
The high, unexplained variances of the ln Sh − ln RV relationships can be attributed to variation in traits that are important for resprouting but not measured here, such as starch and nutrient concentration (e.g. Moreira et al. 2012), which usually span orders of magnitude within tree classes. The highest determination (r 2 = 0.58) corresponded to the allometric fit of Epulauquen in Golondrinas test (Fig. 3b), suggesting lower variance for the above-mentioned or other unmeasured explanatory traits.
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Acknowledgments
We are deeply grateful to the reviewers of the first version of this article, who contributed very precise, constructive suggestions. We thank Mario Huentú and Alejandro González for field assistance. Seed collection and field trial installation were financed with the projects ‘INTA-Native tree species domestication program’ and ‘Sustainable Forest Plantations (BIRF LN 7520 AR)’.
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Communicated by S. C. González-Martínez
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Aparicio, A.G., Zuki, S.M., Azpilicueta, M.M. et al. Genetic versus environmental contributions to variation in seedling resprouting in Nothofagus obliqua . Tree Genetics & Genomes 11, 23 (2015). https://doi.org/10.1007/s11295-015-0847-0
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DOI: https://doi.org/10.1007/s11295-015-0847-0