Research Gaps and Challenges in the Conservation and Use of North American Wild Lettuce Germplasm

Lebeda, A.; Křístková, E.; Kitner, Miloslav; Majeský, Ľuboš; Doležalová, Ivana; Khoury, Colin K.; Widrlechner, Mark P.; Hu, Jinguo; Carver, Daniel; Achicanoy, Harold A.; Sosa, Chrystian C.

doi:10.2135/cropsci2019.05.0350

Cited by 14 publications

(10 citation statements)

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“…As has been found in other clades (Khoury, Carver, Barchenger, et al., 2020; Lebeda et al., 2019), Sorghum 's in situ conservation scores were generally higher than corresponding ex situ scores. This indicates the potential value of in situ conservation to CWR protection, with the possibility for many taxa to be protected by a single well‐placed protected area (Maxted et al., 2013).…”

Section: Discussionsupporting

confidence: 64%

Modelled distributions and conservation priorities of wild sorghums (Sorghum Moench)

Myrans

Díaz

Khoury

et al. 2020

Diversity and Distributions

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Aim To fill knowledge gaps regarding the distributions, ecogeographic niches and conservation status of sorghum's wild relatives (Sorghum Moench). Location The study covered the potential native ranges of wild Sorghum taxa worldwide, including Australia, New Guinea, Asia, Africa and Central America. Methods We modelled the distributions of 23 wild Sorghum taxa, characterized their ecogeographic niches, assessed their conservation status both ex situ and in situ and performed preliminary threat assessments. Results Three taxa were categorized as “high priority” for further conservation based on their ex situ and in situ assessments, with a further 19 as “medium priority” and only one as “low priority”. The preliminary threat assessment indicated that 12 taxa may be Endangered, four Vulnerable and four Near Threatened. The taxa fill a wide range of climatic niches, both across and within taxa, including temperatures and precipitation. Main conclusions Taxon richness hotspots, especially in northern Australia, represent hotspots for conservation action, including further seed collection and habitat protection, with Sorghum macrospermum E. D. Garber being the highest priority for increased in situ protection. Outside Australia, Sorghum propinquum (Kunth) Hitchc. stands out for further ex situ conservation, especially given its close relationship to the crop.

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Section: Discussionsupporting

confidence: 64%

Modelled distributions and conservation priorities of wild sorghums (Sorghum Moench)

Myrans

Díaz

Khoury

et al. 2020

Diversity and Distributions

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“…Lactuca serriola lacks that inner core, and the leaves unfurl fully. The leaves have a greater abundance of trichomes and exhibit considerable phenotypic variation in leaf shape among populations (Lebeda et al., 2019). When L. serriola bolts, cauline leaves orient themselves vertically as they develop and expand, causing the leaf to receive maximal photon flux late in the day (Werk & Ehleringer, 1984), which reduces midday leaf temperature and transpiration (Werk & Ehleringer, 1985).…”

Section: Introductionmentioning

confidence: 99%

Comparative photosynthesis physiology of cultivated and wild lettuce under control and low‐water stress

2020

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Lettuce (Lactuca sativa L.) is an important vegetable crop; however, increased demand and reduced recharge to the aquifer systems in the major field growing regions are making irrigation requirements more difficult and costly to meet. If lettuce production is to be sustainable in these regions, there is a need to breed varieties with higher water use efficiency (WUE) that produce similar biomass under reduced irrigation. The wild progenitor of lettuce, Lactuca serriola L., is a common, ruderal weed that is generally considered more drought tolerant than its cultivated relative. We compared the photosynthetic physiology of two representative accessions of these species under progressive low‐water stress for 10 d and observed that leaf intrinsic WUE was higher under moderate low‐water stress in L. serriola acc. US96UC23 than lettuce cultivar ‘Salinas’. Carbon assimilation (A) and carboxylating efficiency was generally higher in US96UC23 under control water treatments, which we determine to be due to higher mesophyll conductance (gm). No differences were observed between the two species in concentrations of the carboxylating enzyme Rubisco. We find mesophyll limitations to be the most significant relative limiting factor in Salinas. The domestication of cultivated lettuce from this wild relative involved intensive morphological alteration of the leaf, which appears to have led to significantly reduced gm and, concomitantly, A. Breeding for improved gm in lettuce may lead to increases in A and WUE under moderate low‐water stress.

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“…Three papers focused on specific crops such as carrots, lettuce and cranberry provide an important speciesspecific approach to plant conservation (Mezghani et al, 2019;Lebeda et al, 2019;Rodríguez-Bonilla et al, 2019). A crop-specific approach can highlight conservation priorities as well as persisting gaps in species-specific knowledge of taxonomy, crossability, distribution and trait characterizations.…”

Section: Why Connect Agriculture Public Gardens and Science?mentioning

confidence: 99%

Crop Science Special Issue: Connecting Agriculture, Public Gardens and Science

Novy

Moreau

2019

Crop Science

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Research Gaps and Challenges in the Conservation and Use of North American Wild Lettuce Germplasm

Abstract: REVIEW & INTERPRETATIONC rop wild relatives (CWR) represent a large pool of genetic diversity from which to draw new allelic variation required in breeding programs (Maxted et al., 2006). Crop wild relatives have been extremely valuable in adapting crop varieties

Cited by 14 publications

References 77 publications

Modelled distributions and conservation priorities of wild sorghums (Sorghum Moench)

Modelled distributions and conservation priorities of wild sorghums (Sorghum Moench)

Comparative photosynthesis physiology of cultivated and wild lettuce under control and low‐water stress

Crop Science Special Issue: Connecting Agriculture, Public Gardens and Science

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