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Phenotypic plasticity and genetic adaptation of functional traits influences intra-specific variation in hydraulic efficiency and safety.
Pritzkow, Carola; Williamson, Virginia; Szota, Christopher; Trouvé, Raphael; Arndt, Stefan K.
Afiliación
  • Pritzkow C; School of Ecosystem and Forest Sciences, University of Melbourne, 500 Yarra Blvd Burnley, VIC 3121, Australia.
  • Williamson V; School of Ecosystem and Forest Sciences, University of Melbourne, 500 Yarra Blvd Burnley, VIC 3121, Australia.
  • Szota C; School of Ecosystem and Forest Sciences, University of Melbourne, 500 Yarra Blvd Burnley, VIC 3121, Australia.
  • Trouvé R; School of Ecosystem and Forest Sciences, University of Melbourne, 500 Yarra Blvd Burnley, VIC 3121, Australia.
  • Arndt SK; School of Ecosystem and Forest Sciences, University of Melbourne, 500 Yarra Blvd Burnley, VIC 3121, Australia.
Tree Physiol ; 40(2): 215-229, 2020 02 20.
Article en En | MEDLINE | ID: mdl-31860729
Understanding which hydraulic traits are under genetic control and/or are phenotypically plastic is essential in understanding how tree species will respond to rapid shifts in climate. We quantified hydraulic traits in Eucalyptus obliqua L'Her. across a precipitation gradient in the field to describe (i) trait variation in relation to long-term climate and (ii) the short-term (seasonal) ability of traits to adjust (i.e., phenotypic plasticity). Seedlings from each field population were raised under controlled conditions to assess (iii) which traits are under strong genetic control. In the field, drier populations had smaller leaves with anatomically thicker xylem vessel walls, a lower leaf hydraulic vulnerability and a lower water potential at turgor loss point, which likely confers higher hydraulic safety. Traits such as the water potential at turgor loss point and ratio of sapwood to leaf area (Huber value) showed significant adjustment from wet to dry conditions in the field, indicating phenotypic plasticity and importantly, the ability to increase hydraulic safety in the short term. In the nursery, seedlings from drier populations had smaller leaves and a lower leaf hydraulic vulnerability, suggesting that key traits associated with hydraulic safety are under strong genetic control. Overall, our study suggests a strong genetic control over traits associated with hydraulic safety, which may compromise the survival of wet-origin populations in drier future climates. However, phenotypic plasticity in physiological and morphological traits may confer sufficient hydraulic safety to facilitate genetic adaptation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Xilema / Sequías Idioma: En Revista: Tree Physiol Asunto de la revista: BOTANICA / FISIOLOGIA Año: 2020 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Canadá
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Xilema / Sequías Idioma: En Revista: Tree Physiol Asunto de la revista: BOTANICA / FISIOLOGIA Año: 2020 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Canadá