Campus Units

Ecology, Evolution and Organismal Biology, Horticulture

Document Type

Article

Publication Version

Published Version

Publication Date

2019

Journal or Book Title

Crop Science

Volume

59

Issue

6

First Page

2337

Last Page

2356

DOI

10.2135/cropsci2019.05.0350

Abstract

The North American crop wild relatives (CWR) of lettuce (Lactuca L.) represent an underexplored pool of genetic diversity of potential value to breeding programs. The 10 species belong to three different groups: a native clade including at least six allotetraploid species [L. biennis (Moench) Fernald, L. canadensis L., L. floridana (L.) Gaertn., L. graminifolia Michx., L. hirsuta Muhl. ex Nutt., and L. ludoviciana (Nutt.) Riddell], a diploid clade with one species [L. tatarica (L.) C. A. Mey. subsp. pulchella (Pursh) Stebbins], and a clade related to the cultivated taxon (L. sativa L.) with three non‐native species (L. saligna L., L. serriola L., and L. virosa L.). 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.

Comments

This article is published as Lebeda, Aleš, Eva Křístková, Miloslav Kitner, Ľuboš Majeský, Ivana Doležalová, Colin K. Khoury, Mark P. Widrlechner et al. "Research gaps and challenges in the conservation and use of North American wild lettuce germplasm." Crop Science 59, no. 6 (2019): 2337-2356. doi: 10.2135/cropsci2019.05.0350.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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