A review of the history and taxonomy of the enigmatic southern African endemic wild lettuce Lactuca dregeana DC. (Asteraceae: Lactuceae: Lactucinae)

Herwijnen, Z.O. van; Manning, John C.

doi:10.1016/j.sajb.2016.08.016

Cited by 5 publications

(7 citation statements)

References 7 publications

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“…Although, Koopman et al (1998), Koopman et al (2001) and Wei et al (2015) confirmed the very close relationship between L. serriola and L. dregeana and considered the two taxa to be conspecific based on AFLP fingerprints, nuclear and plastid DNA sequence comparison, isozymes and RAPD results of the present research recognized differences between them adequate to maintain them as distinct species, confirming the previous morphological, karyological, historical occurrence, and ecological studies (Zohary 1991;El-Esawi and Sammour 2014;van Herwijnen and Manning 2017).…”

Section: Discussionsupporting

confidence: 86%

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Molecular diversity in Lactucaspeciesusing Isozymes and RAPD Markers

Sammour

Mustafa

2021

Preprint

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Understanding of the molecular basis of genetic diversity in Lactucaaccessions is substantial for the management, improvementand efficient uses of Lactuca accessions. Therefore, this workaimed to evaluate molecular diversity among twenty-six accessions of Lactuca species usingisozymes and RAPD analyses. The polymorphic percentages were 87.09%and 100% in isozymes and RAPD analyses respectively, indicating a high genetic variation within and among Lactuca species. The number of alleles were higher in the wild species compared to the cultivated species, reflecting a reduction in the richness of alleles in the cultivated species due to domestication that caused a reduction in genetic diversity to meet the demand for high crop productivity.Isozymes and RAPD clustering dendrogrames: (1) separated,L. sativa accessions in more than one cluster confirming their polyphyletic origin; (2)collected the accessions of L. vimineain one cluster revealed its homogeneity; and (3) divided the accessions of L.saligna in two clusters varied in the number of alleles, particularly “A” form. The corresponding analysis associated the accessions of the wild species based on the alleles “B”of the tested isozymes and the cultivated species on alleles “A” and “C”, suggesting that: (1) allele “B” might be the primitive form of these loci that can tolerate the environmental stresses which prevails in the habitats of the wild species, and (2) “A” and “C” could be the derived forms. These results are of great interest for the management of Lactuca germplasm and for future breeding programs of lettuce.

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Section: Discussionsupporting

confidence: 86%

“…The primary gene pool of L. sativa L. is represented by a worldwide spread L. serriola, further L. aculeata, L. scarioloides, L. altaica,L. azerbaijancia, L. georgica originating in Asia and L. dregeananative to South Africa (Zohary 1991;van Herwijnen and Manning 2017). The secondary gene pool includesL.…”

Section: Introductionmentioning

confidence: 99%

Molecular diversity in Lactucaspeciesusing Isozymes and RAPD Markers

Sammour

Mustafa

2021

Preprint

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“…The separation of L. dregeana with L. virosa in the same cluster in isozymes and RAPD cluster analyses con rmed their closely relatedness as they belong to the same section Lactuca (Lebeda and Astley 1999), having one pair of satellites (El-Esawi and Sammour 2014) and similar morphological characters (De Candolle, 1838). Although, Wei et al (2015) con rmed the very close relationship between L. serriola and L. dregeana and considered the two taxa to be conspeci c based on AFLP ngerprints, nuclear and plastid DNA sequence comparison, isozymes and RAPD results of the present research recognized differences between them adequate to maintain them as distinct species, con rming the previous morphological, karyological, historical occurrence, and ecological studies (Zohary 1991;El-Esawi and Sammour 2014;van Herwijnen and Manning 2017).…”

Section: Discussionsupporting

confidence: 77%

“…Estimating the genetic diversity between and within accessions of crop species and its wild relatives assist in decision-making to select the best accessions for selection of parents for hybridization and is crucial for providing information for domestication and propagation (Yu et al 2001;Khan et al 2019). It is also enhancing the understanding of the plant germplasm for germplasm management and potential users, and helping in producing new varieties best adapted to regional environmental conditions (El-Esawi, et al 2017;van Herwijnen and Manning 2017).…”

Section: Discussionmentioning

confidence: 99%

“…The primary gene pool of L. sativa L. is represented by a worldwide spread L. serriola, further L. aculeata, L. scarioloides, L. altaica, L. azerbaijancia, L. georgica originating in Asia and L. dregeana native to South Africa (Zohary 1991;van Herwijnen and Manning 2017). The secondary gene pool includes L. saligna, whereas the tertiary gene pool includes the species that can be crossed with di culties with L. sativa, e.g.…”

Section: Introductionmentioning

confidence: 99%

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Molecular Diversity in Lactuca Species Using Isozymes and RAPD Markers

Sammour

Mustafa

El‐Esawi

2021

Preprint

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Background: understanding molecular diversity in Lactuca species is substantial for the management, improvement and efficient uses of their accessions. Therefore, this work aimed to evaluate molecular diversity among and within Lactuca species. Methods and Results: the molecular diversity was assessed using isozymes and RAPD analyses that gave 87.09% and 100% polymorphic percentages respectively, indicating a high genetic variation within and among Lactuca species. The number of alleles were higher in the wild species compared to the cultivated species, reflecting a reduction in the richness of alleles in the cultivated species due to domestication that caused a reduction in genetic diversity to meet the demand for high crop productivity. Isozymes and RAPD clustering dendrogrames: (1) separated, L. sativa accessions in more than one cluster confirming their polyphyletic origin; (2) collected the accessions of L. viminea in one cluster revealed its homogeneity; and (3) divided the accessions of L. saligna in two clusters varied in the number of alleles, particularly “A” form. The corresponding analysis associated the accessions of the wild species based on “B” form of the alleles of the tested isozymes, and the cultivated species on the forms “A” and “C”, suggesting that: (1) allele “B” might be the primitive form of these loci that can tolerate the environmental stresses which prevails in the habitats of the wild species, and (2) forms “A” and “C” could be the derived forms. Conclusions: These results are of great interest for the management of Lactuca germplasm and for future breeding programs of lettuce.

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Wild Lactuca Species in North America

Lebeda

Křístková

Doležalová

et al. 2019

North American Crop Wild Relatives, Volume 2

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This chapter presents a brief history of the uses of lettuce (Lactuca sativa L.) and its wild North American relatives, and reviews the agricultural importance of lettuce and challenges in its cultivation, in relation to nutritional quality, diseases, pests, and edaphic and climatic limitations. The evolution and taxonomy of the genus Lactuca are presented, with a primary focus on the wild Lactuca species of North America, their characterization, biogeography and distribution, habitat ecology, and genepools. Specific examples of phenotypic variability, genetic diversity and disease resistance of wild Lactuca taxa from both published reports and recent evaluations conducted in our laboratory are also presented. The past (and future) exploitation of wild Lactuca relatives in lettuce breeding is examined and discussed in the broader context of crop improvement. The current status of in situ and ex situ conservation of wild and weedy North American Lactuca is reviewed, along with recommendations on how these genetic resources could be better conserved and utilized.

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A review of the history and taxonomy of the enigmatic southern African endemic wild lettuce Lactuca dregeana DC. (Asteraceae: Lactuceae: Lactucinae)

Cited by 5 publications

References 7 publications

Molecular diversity in Lactucaspeciesusing Isozymes and RAPD Markers

Molecular diversity in Lactucaspeciesusing Isozymes and RAPD Markers

Molecular Diversity in Lactuca Species Using Isozymes and RAPD Markers

Wild Lactuca Species in North America

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