North American Continent - A New Source of Wild Lactuca Spp. Germplasm Variability for Future Lettuce Breeding

Lebeda, A.; Doležalová, Ivana; Kitner, Miloslav; Novotná, Alžběta; Šmachová, P.; Widrlechner, Mark P.

doi:10.17660/actahortic.2011.918.59

Cited by 8 publications

(2 citation statements)

References 14 publications

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“…Earlier studies from our laboratory have described differences in the genetic backgrounds of various Lactuca species on a large geographical scale, i.e., genetic differentiation of samples originating from different countries (Kitner et al 2008;Lebeda et al 2009bLebeda et al , 2011Jemelková et al 2013). D'Andrea et al (2006 also described a high genetic differentiation among individual L. serriola populations.…”

Section: Genetic Variationmentioning

confidence: 99%

Genetic structure and diversity in natural populations of three predominantly self-pollinating wild Lactuca species in Israel

Kitner

Majeský

Křístková

et al. 2014

Genet Resour Crop Evol

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It is important to optimize strategies for collecting wild germplasm from their natural habitats for the successful conservation of plant genetic resources. We studied the population structure of three predominantly self-pollinating wild Lactuca species (Lactuca serriola, L. saligna, and L. aculeata). Seeds for this study were collected from individual plants in northern Israel, along a line transect, and two populations per each Lactuca species. The distance between neighboring plants sampled for seeds varied from 1.5 to 37 m. The transect length at single sites ranged from 47.2 to 151.8 m. The taxonomic status of 67 individual plants was morphologically validated during greenhouse multiplication. Both genetic structure and diversity were analyzed by using 11 EST-SSR loci and 230 AFLP markers. Relatively low genetic diversity values were observed, increasing in the following order: L. aculeata \ L. serriola \ L. saligna. Network analysis clearly separated samples according to their taxonomic determination; also reflecting the gene diversity as well as the genetic distance values among the three species. Nevertheless, given the predominantly selfing character of these species, populations were not uniform (genetically and morphologically). It seems that overall genetic variation in a population increases at its periphery, due to the presence of plants with ''non-indigenous'' alleles, which are most likely coming from migration and subsequent interpopulation or interspecific hybridization. Mantel tests generally indicated a positive association between genetic distance and micro-geographical distance of a particular population, primarily due to the ''outlier'' samples collected at a population's periphery.

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Section: Genetic Variationmentioning

confidence: 99%

Genetic structure and diversity in natural populations of three predominantly self-pollinating wild Lactuca species in Israel

Kitner

Majeský

Křístková

et al. 2014

Genet Resour Crop Evol

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“…In Montreal, powdery mildew was observed in 24 locations involving both L. serriola f. serriola and f. integrifolia . Populations of L. serriola f. integrifolia had either low or high levels of infection, whereas populations of L. serriola f. serriola displayed various infection levels (Lebeda et al. , 2010a).…”

Section: Occurrence and Geographic Distribution Of G Cichoracearum Omentioning

confidence: 99%

Taxonomy, distribution and biology of lettuce powdery mildew (Golovinomyces cichoracearum sensu stricto)

Lebeda¹,

Mieslerová

2010

Plant Pathology

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This paper reviews the taxonomy, biology, importance, host-pathogen interactions and control of lettuce powdery mildew. The main causal agent of this disease, Golovinomyces cichoracearum s.s., is an important powdery mildew pathogen of many members of the family Asteraceae. The pathogen is distributed worldwide and occurs on Lactuca sativa as well as wild Lactuca spp. and related taxa (e.g. Cichorium spp.). Powdery mildew of lettuce can be a major problem in production areas with favourable environmental conditions for disease development (dry, hot weather). The fungus grows ectophytically and appears as white, powdery growth on both the upper and lower sides of leaves. There is rather limited information on the geographic distribution of powdery mildew on wild Lactuca spp. Most L. sativa cultivars have been found to be susceptible. Large variability in virulence was confirmed and existence of different races is supposed. Resistance in L. sativa and some related wild Lactuca spp. is characterized by race-specificity, but the genetic background of resistance is poorly understood. Sources of resistance are known in L. saligna and L. virosa. Lettuce powdery mildew can be effectively controlled by common fungicides (e.g. sulphur, myclobutanil, quinoline, strobilurins, etc.) and protective compounds (e.g. extract of neem oil, Reynoutria sachaliensis extracts). However, fungicide resistance may arise. Non-fungicidal activators of plant systemic acquired resistance (SAR) had no direct effect on the causal agent. Future issues regarding lettuce powdery mildew research are summarized.

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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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North American Continent - A New Source of Wild Lactuca Spp. Germplasm Variability for Future Lettuce Breeding

Abstract: In

Cited by 8 publications

References 14 publications

Genetic structure and diversity in natural populations of three predominantly self-pollinating wild Lactuca species in Israel

Genetic structure and diversity in natural populations of three predominantly self-pollinating wild Lactuca species in Israel

Taxonomy, distribution and biology of lettuce powdery mildew (Golovinomyces cichoracearum sensu stricto)

Wild Lactuca Species in North America

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