The genetics of drought tolerance in conifers

What is it about?

As temperatures warm and precipitation patterns shift due to climate change, interest in identifying tree genotypes that will thrive under more arid conditions has grown. In this review, we discuss the multiple definitions of "drought tolerance" and the biological processes involved in drought responses. We describe the three major approaches taken in studying genetic variation in drought responses, the advantages and shortcomings of each, and what each of these approaches has revealed about the genetic basis of adaptation to drought in conifers. Finally, we discuss how greater knowledge of the genetics of drought tolerance may aid forest management, and give recommendations for how future studies may overcome the limitations of past approaches. In particular, we urge a more direct focus on survival, growth, and the traits that directly predict them (rather than on proxies like water use efficiency), combining research approaches with complementary strengths and weaknesses, and inclusion of a wider range of taxa and life stages.

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