Lettuce, a shallow-rooted crop, and Lactuca serriola, its wild progenitor, differ at QTL determining root architecture and deep soil water exploitation

Johnson, William A.; Jackson, Louise E.; Ochoa, O.; Wijk, R. van; Peleman, J.; Clair, Dina A. St.; Michelmore, Richard W.

doi:10.1007/s001220051581

Cited by 137 publications

(111 citation statements)

References 27 publications

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“…It has already been shown that RILs of the cross between cultivated L. sativa and wild L. serriola used in this study have differentiated root architecture (Johnson et al 2000), seed and seedling traits (Argyris et al 2005), and leaf biophysical and developmental traits (Zhang et al 2007). To our knowledge no classical or quantitative genetic data are available on the genetic basis of traits that differ between wild and cultivated lettuce: the available studies have mostly focussed on offspring fertility of different Lactuca species and among cultivars crosses (Thompson et al 1941;Lindqvist 1960a, b;Prince et al 1979;de Vries 1990).…”

Section: Introductionmentioning

confidence: 67%

“…capitata L. nidus jäggeri Helm) and its wild relative L. serriola f. serriola (UC96US23). The RILs are from the same set as used in Argyris et al (2005), Johnson et al (2000), and Zhang et al (2007). In total, 114 RILs were grown in the greenhouse under 6 h dark and 18 h light, a minimum of 18°C, under 600W SON T-Agro lamps generating on average 160 lmol/m 2 / sec at plant level.…”

Section: Plant Materials and Growing Conditionsmentioning

confidence: 99%

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QTL analysis reveals the genetic architecture of domestication traits in Crisphead lettuce

Hartman

Hooftman

Schranz

et al. 2012

Genet Resour Crop Evol

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The genetic architecture of crop domestication is generally characterized by three trends: relatively few genomic regions with major QTL effects are involved, QTL are often clustered, and alleles derived from the crop do not always contribute to the crop phenotype. We have investigated the genetic architecture of lettuce using a recombinant inbred line population from a cross between a crop Lactuca sativa ('Salinas') and its wild relative L. serriola. Few genomic regions with major QTL, plus various intermediate QTL, largely control the transition from wild to cultivated Crisphead lettuce. Allelic effects of all major QTL were in the expected direction, but there were intermediate QTL where the crop contributed to the wild phenotype and vice versa. We found two main regions with clusters of QTL, one on linkage group 3, where the crop allele induced lower seed output, another on linkage group 7, where the crop allele caused a delay in flowering time. Potentially, knowledge of genetic changes due to the domestication could be relevant for the chance that a transgene inserted in a crop genome will spread to wild relatives due to hitchhiking effects. If a transgene would be inserted in one of these regions, background selection on the crop alleles may lead to a reduced fitness of hybrids with the transgene. QTL research on the effects of domestication genes can thus indicate regions in the crop genome that are less likely to introgress, although these still need to be verified under field conditions.

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Section: Introductionmentioning

confidence: 67%

Section: Plant Materials and Growing Conditionsmentioning

confidence: 99%

QTL analysis reveals the genetic architecture of domestication traits in Crisphead lettuce

Hartman

Hooftman

Schranz

et al. 2012

Genet Resour Crop Evol

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“…Although lettuce is not considered an ideal model crop species, most cultivars are highly inbred and reveal extensive genetic homozygosity, allowing for genetic tools to be developed ). There have been several iterations of lettuce linkage maps developed from intra-specific crosses in L. sativa (Landry et al 1987;Kesseli et al 1994;Waycott et al 1999;Hayashi et al 2008;Atkinson et al 2013b;Jenni et al 2013) and from inter-specific crosses between L. sativa and wild relatives L. serriola (Johnson et al 2000;Syed et al 2006;McHale et al 2009) and L. saligna (Jeuken et al 2001). More recently these have been developed into an ultra-high density consensus map Stoffel et al 2012) and an annotated genome sequence assembly of lettuce (Reyes-Chin-Wo et al 2017) is available at the Lettuce Genome Resource (https://lgr.genomecenter.…”

Section: Breeding Strategiesmentioning

confidence: 99%

Oxidative discolouration in whole-head and cut lettuce: biochemical and environmental influences on a complex phenotype and potential breeding strategies to improve shelf-life

et al. 2017

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Lettuce discolouration is a key post-harvest trait. The major enzyme controlling oxidative discolouration has long been considered to be polyphenol oxidase (PPO) however, levels of PPO and subsequent development of discolouration symptoms have not always correlated. The predominance of a latent state of the enzyme in plant tissues combined with substrate activation and contemporaneous suicide inactivation mechanisms are considered as potential explanations for this phenomenon. Leaf tissue physical properties have been associated with subsequent discolouration and these may be influenced by variation in nutrient availability, especially excess nitrogen and head maturity at harvest. Mild calcium and irrigation stress has also been associated with a reduction in subsequent discolouration, although excess irrigation has been linked to increased discolouration potentially through leaf physical properties. These environmental factors, including high temperature and UV light intensities, often have impacts on levels of phenolic compounds linking the environmental responses to the biochemistry of the PPO pathway. Breeding strategies targeting the PAL and PPO pathway biochemistry and environmental response genes are discussed as a more cost-effective method of mitigating oxidative discolouration then either modified atmosphere packaging or post-harvest treatments, although current understanding of the biochemistry means that such programs are likely to be limited in nature and it is likely that they will need to be deployed alongside other methods for the foreseeable future.Keywords Lettuce Á Discolouration Á Biochemistry Á Environment Á Polyphenols Á Phenylpropanoid pathway Á Review The value of lettuceThe UK processed salad sector was valued at approximately £848 million in

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“…QTL analysis has provided physiologists with an opportunity to genetically analyse important traits such as root architecture (Johnson et al 2000), phytohormone concentration (Sanguineti et al 1999), potato tuberization (Davies et al 1999), apomixis (Ası´ns et al 2001) and osmotic adjustment (Zhang et al 1999). …”

Section: Genetic Analysis Of Complex Traitsmentioning

confidence: 99%

Present and future of quantitative trait locus analysis in plant breeding

2002

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The joint analysis of genotype marker segregation and phenotypic values of individuals or lines enables the detection and location of loci affecting quantitative traits (QTL). The availability of DNA markers and powerful biometric methods has led to considerable progress in QTL mapping in plants.The most obvious applications of QTL analysis seem to be marker-assisted selection (MAS) in breeding and pre-breeding and QTL cloning. However, other areas are envisaged where QTL analysis can contribute decisively. These are: the understanding of complex traits such as plant-pathogen interaction; plant genomics, connecting proteins and regulatory elements of known functions to QTL by candidate gene analysis; and germplasm enhancement through a characterization that allows its efficient utilization. The success in all these applications depends primarily on the reliability and accuracy of the QTL analysis itself. Therefore, the discussion of its limitations will constitute an important part of this review.

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Lettuce, a shallow-rooted crop, and Lactuca serriola, its wild progenitor, differ at QTL determining root architecture and deep soil water exploitation

Cited by 137 publications

References 27 publications

QTL analysis reveals the genetic architecture of domestication traits in Crisphead lettuce

QTL analysis reveals the genetic architecture of domestication traits in Crisphead lettuce

Oxidative discolouration in whole-head and cut lettuce: biochemical and environmental influences on a complex phenotype and potential breeding strategies to improve shelf-life

Present and future of quantitative trait locus analysis in plant breeding

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