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Robert, Vincent J.M.; West, Marilyn A. L.; Inai, Shuji; Caines, Angela; Arntzen, Lauren; Smith, Jodee K.; Clair, Dina A. St.

doi:10.1023/a:1013734024200

Cited by 57 publications

(5 citation statements)

References 48 publications

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“…Backcrossing has been applied in plant breeding for fine-mapping of QTLs and for the introgression of desired QTL alleles from wild donors into elite cultivars [35-37]. In crop-to-wild gene flow, repeated backcrossing to the wild parent might take place along with selfing as a result of the often much higher frequency of wild individuals compared to crop-wild hybrids.…”

Section: Discussionmentioning

confidence: 99%

Crop to wild introgression in lettuce: following the fate of crop genome segments in backcross populations

Uwimana¹,

Smulders²,

Hooftman

et al. 2012

BMC Plant Biol

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BackgroundAfter crop-wild hybridization, some of the crop genomic segments may become established in wild populations through selfing of the hybrids or through backcrosses to the wild parent. This constitutes a possible route through which crop (trans)genes could become established in natural populations. The likelihood of introgression of transgenes will not only be determined by fitness effects from the transgene itself but also by the crop genes linked to it. Although lettuce is generally regarded as self-pollinating, outbreeding does occur at a low frequency. Backcrossing to wild lettuce is a likely pathway to introgression along with selfing, due to the high frequency of wild individuals relative to the rarely occurring crop-wild hybrids. To test the effect of backcrossing on the vigour of inter-specific hybrids, Lactuca serriola, the closest wild relative of cultivated lettuce, was crossed with L. sativa and the F1 hybrid was backcrossed to L. serriola to generate BC1 and BC2 populations. Experiments were conducted on progeny from selfed plants of the backcrossing families (BC1S1 and BC2S1). Plant vigour of these two backcrossing populations was determined in the greenhouse under non-stress and abiotic stress conditions (salinity, drought, and nutrient deficiency).ResultsDespite the decreasing contribution of crop genomic blocks in the backcross populations, the BC1S1 and BC2S1 hybrids were characterized by a substantial genetic variation under both non-stress and stress conditions. Hybrids were identified that performed equally or better than the wild genotypes, indicating that two backcrossing events did not eliminate the effect of the crop genomic segments that contributed to the vigour of the BC1 and BC2 hybrids. QTLs for plant vigour under non-stress and the various stress conditions were detected in the two populations with positive as well as negative effects from the crop.ConclusionAs it was shown that the crop contributed QTLs with either a positive or a negative effect on plant vigour, we hypothesize that genomic regions exist where transgenes could preferentially be located in order to mitigate their persistence in natural populations through genetic hitchhiking.

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Section: Discussionmentioning

confidence: 99%

Crop to wild introgression in lettuce: following the fate of crop genome segments in backcross populations

Uwimana¹,

Smulders²,

Hooftman

et al. 2012

BMC Plant Biol

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“…Quantitative resistance, also called partial resistance and generally controlled by QTLs, provides in most of the cases a more durable and broad-spectrum resistance (Cowger and Brown 2019); in addition, resistance QTLs are more frequent than major resistance genes in natural genetic resources. Many resistance QTLs have been mapped in the tomato genome, particularly for resistance traits to P. infestans (Arafa et al 2017;Foolad et al 2008;Ohlson et al 2018;Ohlson and Foolad 2016;Panthee et al 2017;Smart et al 2007), O. lycopersici (Bai et al 2003), Alternaria solani (Foolad et al 2002), Alternaria alternata (Robert et al 2001), Xanthomonas sp. (Hutton et al 2010;Sim et al 2015), C. michiganensis (Coaker and Francis 2004;Kabelka et al 2002), Ralstonia solanacearum (Carmeille et al 2006;Mangin et al 1999;, Botrytis cinerea (Davis et al 2009;Finkers et al 2008;Finkers et al 2007) and Cucumber mosaic virus (CMV) (Stamova and Chetelat 2000).…”

Section: Resistance Gene and Qtl Discoverymentioning

confidence: 99%

Genomic Designing for Climate-Smart Tomato

Causse

Zhao

Diouf

et al. 2020

Genomic Designing of Climate-Smart Vegetable Crops

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“…Hence, QTLs mapped in one population may have low significance for other populations. Genetic improvement using the advanced backcross quantitative trait loci AB-QTL technique has been utilized for many important traits, such as fruit quality improvement and fungus (mold) resistance in tomato [127]. Advances made in utilization of gene pyramiding techniques to improve the yield, quality, and stress tolerance in many crops are summarized in Table 1.…”

Section: Gene Pyramiding Involving Polygenic Applicationsmentioning

confidence: 99%

Gene Pyramiding for Sustainable Crop Improvement against Biotic and Abiotic Stresses

Dormatey¹,

Sun²,

Ali³

et al. 2020

Preprint

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Sustainable agricultural production is endangered by several ecological factors such as drought, extreme temperatures, excessive salts, parasitic ailments, and insect pest infestation. These challenging environmental factors may have adverse effects on future agriculture production in many countries. In modern agriculture, conventional crop breeding techniques alone are inadequate for achieving the increasing population’s food demand on a sustainable basis. The advancement of molecular genetics and related technologies are promising tools for the selection of new crop species. Gene pyramiding through marker assisted selection (MAS) and other techniques have accelerated the development of durable resistant/tolerant lines with high accuracy in the shortest possible period of time for agricultural sustainability. Gene stacking has not been fully utilized for biotic stress resistance development and quality improvement in most of the major cultivated crops. This review emphasizes on gene pyramiding techniques that are being successfully deployed in modern agriculture for improving crop tolerance to abiotic and biotic stresses for sustainable crop improvement.

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Cited by 57 publications

References 48 publications

Crop to wild introgression in lettuce: following the fate of crop genome segments in backcross populations

Crop to wild introgression in lettuce: following the fate of crop genome segments in backcross populations

Genomic Designing for Climate-Smart Tomato

Gene Pyramiding for Sustainable Crop Improvement against Biotic and Abiotic Stresses

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