Lower bark density was also related to higher stem hydraulic conductivity, carbon assimilation, and growth. In fact, species with a thicker and less dense inner bark were the ones that had the highest water contents in the wood, bark, and leaves. The structural and functional variations of the bark were also associated with water storage and transport, functions related to properties of the inner bark. Because of their thick bark, none of the trees analyzed were top-killed after a severe fire event. Here we evaluated how the structural and functional variations of bark are related to the processes of resilience and resistance to fire, as well as transport and storage of water in 31 native species from the Brazilian Cerrado. Thus, little is known about how the morpho-anatomical variations of this structure are related to different ecological pressures, especially in tropical savanna species, which are commonly subjected to frequent fire and drought events. Bark is a structure involved in multiple physiological functions, but which has been traditionally associated with protection against fire.
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