The authors grew twelve populations of cocksfoot originating from Mediterranean, Temperate and Northern European areas in a controlled environment in pots. They measured dehydration tolerance, leaf and stem anatomical traits and xylem pressure associated with 88 or 50 % loss of xylem conductance (P88, P50). They found embolism resistance correlated with the precipitations of the origin sites of the populations, dehydration tolerance, leaf mechanical resistance and the thickness of metaxylem vessel walls in stems.
Compared with woody species, the large intraspecific variability in dehydration tolerance and embolism resistance within cocksfoot has consequences for its sensitivity to climate change. To better understand adaptive strategies of herbaceous species to increasing drought and frost requires further exploration of the role of hydraulic and mechanical traits using a larger inter- and intraspecific range of species.