Research Gaps and Challenges in the Conservation and Use of North American Wild Lettuce Germplasm
The North American crop wild relatives (CWR) of lettuce (Lactuca L.) represent an underexplored
pool of genetic diversity of potential value to breeding programs. In this review, we examine the role of herbarium and genebank holdings in taxonomic and other foundational studies, as well as for germplasm exploration and use. We compile the state of knowledge on the ranges of lettuce CWR in North America, modeling the potential distributions of the species and assessing their ex
situ and (for native species) in situ conservation status. We categorize seven of the species as
high priority for further conservation and three as medium priority, with none currently considered
low priority or sufficiently conserved. Further, we review morphological, phenological, genetic diversity, and pest and disease information with regard to North American species. We conclude by outlining the critical gaps and describing a way forward for addressing challenges in the conservation and use of North American wild lettuce germplasm.