Tree Genetics & Genomes

, Volume 10, Issue 5, pp 1191–1203

Among-population variation and plasticity to drought of Atlantic, Mediterranean, and interprovenance hybrid populations of maritime pine

Original Paper

DOI: 10.1007/s11295-014-0753-x

Cite this article as:
de la Mata, R., Merlo, E. & Zas, R. Tree Genetics & Genomes (2014) 10: 1191. doi:10.1007/s11295-014-0753-x

Abstract

Maritime pine grows naturally under a wide range of climatic conditions, from strongly Atlantic to strongly Mediterranean. Aiming to improve our understanding of the genetic structure and inheritance of drought resistance strategies in the species, we conducted an environmentally controlled experiment to assess the genetic variation and plasticity to drought of Atlantic and Mediterranean populations, and the interprovenance hybrids between them. Hybridization could also help to provide new genetic material for use in transitional areas between the two regions, for which reproductive materials of good quality are generally lacking. Plastic responses to water stress appeared to be highly conserved among populations, with a common conservative isohydric strategy based on promoting growth when water was abundant, and stopping it when water became limiting. We found, however, a strong intraspecific variation in biomass allocation patterns. The Atlantic populations showed a risky growth-based strategy with a larger amount of juvenile needles, whereas Mediterranean populations showed a more conservative strategy, minimizing aerial growth and increasing the proportion of adult needles that is more resistant to water loss. Hybrid populations performed more similarly to the Mediterranean parent, suggesting a dominance of the Mediterranean-like characteristics. Some of the tested hybrid populations, however, combined high growth with traits of drought adaptation, and thus represent potentially interesting materials for use in transitional regions between the two climate zones.

Keywords

Phenotypic plasticity Drought stress Pinus pinaster Interprovenance hybrids Biomass allocation Optimal partitioning theory 

Supplementary material

11295_2014_753_MOESM1_ESM.pdf (139 kb)
Online Resource 1(PDF 138 kb)
11295_2014_753_MOESM2_ESM.pdf (1.9 mb)
Online Resource 2(PDF 1952 kb)
11295_2014_753_MOESM3_ESM.pdf (109 kb)
Online Resource 3(PDF 108 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  1. 1.Division of Biological SciencesThe University of MontanaMissoulaUSA
  2. 2.Madera Plus Co.San Cibrao das ViñasSpain
  3. 3.Misión Biológica de Galicia, MBG-CSICPontevedraSpain

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