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Integration of defensive strategies and defensive investment with other life history traits in a Pinus pinaster population

AuthorsLópez-Goldar, Xosé ; Martín-Sanz, Ruth; Voltas, Jordi; Climent, José; Sampedro Pérez, Luis
Issue DateJul-2015
PublisherInternational Society of Chemical Ecology
Citation31st conference of the International Society of Chemical Ecology (ISCE2015): 490 (Poster 230)
AbstractAs any other living entity, forest trees must optimize resource investment to growth, reproduction and maintenance, but investment in one function may occur at the expense of other functions, resulting in trade-offs that limit maximization of all processes. Global change is imposing new challenges to Mediterranean forests, in particular combined abiotic and biotic stressors such as drought and epidemic outbreaks of pests and pathogens that may require increased defensive investment. Mediterranean pines are expected to harbour a valuable adaptive genetic diversity, already shaping the populations since long ago, for facing these challenges. Little is known, however, about how populations will respond to multiple challenges, and also about the correlated responses to a single stressor in other life history traits. Here we used as a model a Maritime pine (Pinus pinaster Ait.) population historically exploited by tapping for oleoresin extraction and artificially selected for increased turpentine and rosin production. In a common garden with 60 open-pollinated half-sib families (selected for resin production plus a control seedlot) we evaluated the constitutive and induced resin flux as a proxy of defensive investment and concentration of major groups of chemical defences in phloem-cortex and needles. We also measured a wide set of traits related to growth and maintenance (height, diameter and bark thickness), reproduction (cone counts and serotiny level) and drought-resistance (13C-based water-use efficiency). Our objectives were to determine the intrapopulation genetic variation in these key phenotypic traits and to explore the existence of tradeoffs among adaptive life history traits. Preliminary results showed the existence of significant genetic variation among families for most assessed variables, and distinct trade-offs between growth and maintenance, reproduction and defense. We will discuss to what extent variations in the carbonwater balance at the intra-specific level may mediate the conflicts between investment in growth and defence in a Mediterranean climate.
DescriptionPóster presentado en Estocolmo (Suecia) entre el 29 de junio y el 3 de julio de 2015.
Appears in Collections:(MBG) Comunicaciones congresos
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