Agronomic evaluation of seedlings from crosses between the main Spanish olive cultivar ‘Picual’ and two wild olive trees

Klepo, Tatjana; Toumi, A.; Rosa, Raúl de la; León, Lorenzo; Belaj, Angjelina

doi:10.1080/14620316.2014.11513113

Cited by 18 publications

(13 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Wild olives therefore represent an important source of genes for crop improvement of resistance to abiotic stresses [e.g., salinity (Cantos et al, 2002), water deficit (Hernández-Santana et al, 2019), soil pollution (Murillo et al, 2005)], vigor (León et al, 2020), crop yield and quality (Hannachi et al, 2008;Baccouri et al, 2011;León et al, 2018), as well as for resistance to biotic factors such as the Verticillium wilt (Colella et al, 2008;Arias-Calderon et al, 2015b;Trapero et al, 2015;Jimenez-Fernandez et al, 2016). Wild olive genotypes have been tested in limited breeding studies, showing potential to shorten the juvenile period or to increase flower production (Klepo et al, 2014), to improve oil composition (Hannachi et al, 2008;León et al, 2018) and to improve resistance to soil-borne diseases (Arias-Calderon et al, 2015a).…”

Section: Introductionmentioning

confidence: 99%

SILVOLIVE, a Germplasm Collection of Wild Subspecies With High Genetic Variability as a Source of Rootstocks and Resistance Genes for Olive Breeding

et al. 2020

Self Cite

View full text Add to dashboard Cite

Wild subspecies of Olea europaea constitute a source of genetic variability with huge potential for olive breeding to face global changes in Mediterranean-climate regions. We intend to identify wild olive genotypes with optimal adaptability to different environmental conditions to serve as a source of rootstocks and resistance genes for olive breeding. The SILVOLIVE collection includes 146 wild genotypes representative of the six O. europaea subspecies and early-generations hybrids. These genotypes came either from olive germplasm collections or from direct prospection in Spain, continental Africa and the Macaronesian archipelago. The collection was genotyped with plastid and nuclear markers, confirming the origin of the genotypes and their high genetic variability. Morphological and architectural parameters were quantified in 103 genotypes allowing the identification of three major groups of correlative traits including vigor, branching habits and the belowground-to-aboveground ratio. The occurrence of strong phenotypic variability in these traits within the germplasm collection has been shown. Furthermore, wild olive relatives are of great significance to be used as rootstocks for olive cultivation. Thus, as a proof of concept, different wild genotypes used as rootstocks were shown to regulate vigor parameters of the grafted cultivar "Picual" scion, which could improve the productivity of high-density hedgerow orchards.

show abstract

Section: Introductionmentioning

confidence: 99%

SILVOLIVE, a Germplasm Collection of Wild Subspecies With High Genetic Variability as a Source of Rootstocks and Resistance Genes for Olive Breeding

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…For instance, resistance to verticillium wilt scarcely found in current cultivars, has been observed in wild germplasm ( Colella et al, 2008 ; Arias-Calderón et al, 2015 ), which suggest its potential use as parents in olive breeding programs. Progenies involving wild parents have also showed shorter juvenile period and more abundant flowering than progenies from cultivated parents, which can represent important advantages for olive breeding ( Klepo et al, 2013 , 2014 ). However, it is not fully understood whether the introgression of some beneficial characters could be accompanied by a parallel negative effect regarding some other important agronomic and quality characters.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, based on oil yield and quality, some interesting and well adapted genotypes to the conditions of Australia were selected, although feral but not genuine wild olives were used ( Sedgley, 2004 ). In this sense, in the framework of the olive breeding program of Córdoba Spain, many efforts have been dedicated, in the last decade, to the collection, ex situ conservation and evaluation of wild genotypes from different origins ( Belaj et al, 2007 , 2011 ) as well as initial characterization of some olive progenies involving wild genotypes as parents ( Klepo et al, 2013 , 2014 ).…”

Section: Introductionmentioning

confidence: 99%

Using Wild Olives in Breeding Programs: Implications on Oil Quality Composition

et al. 2018

Self Cite

View full text Add to dashboard Cite

A wide genetic diversity has been reported for wild olives, which could be particularly interesting for the introgression of some agronomic traits and resistance to biotic and abiotic stresses in breeding programs. However, the introgression of some beneficial wild traits may be paralleled by negative effects on some other important agronomic and quality traits. From the quality point of view, virgin olive oil (VOO) from olive cultivars is highly appreciated for its fatty acid composition (high monounsaturated oleic acid content) and the presence of several minor components. However, the composition of VOO from wild origin and its comparison with VOO from olive cultivars has been scarcely studied. In this work, the variability for fruit characters (fruit weight and oil content, OC), fatty acid composition, and minor quality components (squalene, sterols and tocopherols content and composition) was studied in a set of plant materials involving three different origins: wild genotypes (n = 32), cultivars (n = 62) and genotypes belonging to cultivar × wild progenies (n = 62). As expected, values for fruit size and OC in wild olives were lower than those obtained in cultivated materials, with intermediate values for cultivar × wild progenies. Wild olives showed a remarkably higher C16:0 percentage and tocopherol content in comparison to the cultivars. Contrarily, lower C18:1 percentage, squalene and sterol content were found in the wild genotypes, while no clear differences were found among the different plant materials regarding composition of the tocopherol and phytosterol fractions. Some common highly significant correlations among components of the same chemical family were found in all groups of plant materials. However, some other correlations were specific for one of the groups. The results of the study suggested that the use of wild germplasm in olive breeding programs will not have a negative impact on fatty acid composition, tocopherol content, and tocopherol and phytosterol profiles provided that selection for these compounds is conducted from early generations. Important traits such as tocopherol content could be even improved by using wild parents.

show abstract

“…Cultivated olives have undergone a complex domestication process, which has led to morphological and physiological changes. The main traits selected during the transition between oleasters and cultivars are fruit size and oil content (13,55,68). The domestication scenario described in the previous section, which is punctuated by hybridization, may make it difficult to detect genes selected during the process of domestication.…”

Section: Lack Of a Clear Domestication Syndromementioning

confidence: 99%

Genomic evidence for recurrent genetic admixture during domestication mediterranean olive trees (Olea europaea)

Julca

Marcet‐Houben

Cruz

et al. 2020

Preprint

View full text Add to dashboard Cite

BackgroundThe olive tree (Olea europaea L. subsp. europaea, Oleaceae) has been the most economic perennial crop for Mediterranean countries since its domestication around 6,000 years ago. Two taxonomic varieties are currently recognized: cultivated (var. europaea) and wild (var. sylvestris) trees. To shed light into the recent evolution and domestication of the olive tree, we sequenced the genomes of twelve individuals: ten var. europaea, one var. sylvestris, and one outgroup taxon (subsp. cuspidata). All of them were analysed together with an improved assembly of var. europaea reference genome and the available assembly of var. sylvestris.ResultsOur analyses show that cultivated olives exhibit slightly lower levels of overall genetic diversity than wild forms, and that this can be partially explained by the occurrence of a mild population bottleneck 5000-7000 years ago during the primary domestication period. We also provide the first phylogenetic analysis of genome-wide sequences, which supports a continuous process of domestication of the olive tree. This, together with population structure and introgression analyses highlights genetic admixture with wild populations across the Mediterranean Basin in the course of domestication.ConclusionsAltogether, our results suggest that a primary domestication area in the eastern Mediterranean basin was followed by numerous secondary events across most countries of southern Europe and northern Africa, often involving genetic admixture with genetically rich wild populations, particularly from the western Mediterranean Basin. Based on selection tests and a search for selective sweeps, we found that genes associated with stress response and developmental processes were positively selected in cultivars. However, we did not find evidence that genes involved in fruit size or oil content were under positive selection.

show abstract

Agronomic evaluation of seedlings from crosses between the main Spanish olive cultivar ‘Picual’ and two wild olive trees

Cited by 18 publications

References 22 publications

SILVOLIVE, a Germplasm Collection of Wild Subspecies With High Genetic Variability as a Source of Rootstocks and Resistance Genes for Olive Breeding

SILVOLIVE, a Germplasm Collection of Wild Subspecies With High Genetic Variability as a Source of Rootstocks and Resistance Genes for Olive Breeding

Using Wild Olives in Breeding Programs: Implications on Oil Quality Composition

Genomic evidence for recurrent genetic admixture during domestication mediterranean olive trees (Olea europaea)

Contact Info

Product

Resources

About