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Sayed, Haitham; Kayyal, Hamed; Ramsey, Luke; Ceccarelli, Salvatore; Baum, Michaël

doi:10.1023/a:1015861610226

Cited by 34 publications

(5 citation statements)

References 31 publications

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“…The usual way to assess segregation distortion for marker data is by χ 2 tests (Haitham et al, 2002;Lu et al, 2002;Ruiz and Asins, 2003). In the current study, Ninety three (82.3%) primers showed 1:1 disomic segregation pattern and twenty marker alleles (17.69%) showed deviations from Mendelian segregation pattern.…”

Section: Construction Of Genetic Linkage Map and Qtl Mappingmentioning

confidence: 58%

Construction of SSR Based Genetic Linkage Map and Identification of QTLs Conferring CMD Resistance in Cassava

Paikaray¹,

Nair²,

Mohan³

et al. 2020

IJBSM

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Cassava (Manihot esculenta) belonging to the family Euphorbiaceae, is one of the most important tuber crops cultivated extensively in tropical and subtropical regions of Africa and Asia. It is a cross pollinating crop with a diploid number of chromosome 2n=36 and DNA content of 1.67pg per cell. It is highly heterozygous, monoecious and protogynous in nature. The tuberous crop is propagated vegetatively by means of stem cuttings and sexually through seeds. According to Food and Agriculture Organization Corporate Statistical Database (FAOSTAT, 2017), the global cassava production was estimated to be 291992646 tonnes in which 61% is accounted by Africa, 29.3% contributed by Asia and remaining 9.6% by America. Indian cassava production was accounted to be 42 mt from an area of 199 mha with a productivity of 2,09,598 hg ha-1. Cassava is mainly used as food and also as an important raw material for various industrial purposes. The wide acceptability of cassava in the world is increasing due to the broad agro-ecological adaptability, its ability to mitigate unfavourable environmental condition and its abilities to produce reasonable yield. Cassava production is always challenged Article History

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Section: Construction Of Genetic Linkage Map and Qtl Mappingmentioning

confidence: 58%

Construction of SSR Based Genetic Linkage Map and Identification of QTLs Conferring CMD Resistance in Cassava

Paikaray¹,

Nair²,

Mohan³

et al. 2020

IJBSM

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“…Nonetheless as noticed earlier, in the present study, some of the number of positives generated from the BC 1 F 1 cross from CSIR/CRI-ATS06 deviated from the typical Mendelian pattern of segregation, probably due to selfed seeds, which might have resulted in fewer number of positive plants in that backcross. According to Sayed et al (2002) even though markers will generally segregate in a Mendelian manner, distorted segregation ratios may be encountered. Identification of positives for alc gene in BC 1 F 1 generation through phenotypic screening is very difficult and is time consuming.…”

Section: Discussionmentioning

confidence: 99%

Marker assisted backcrossing of alcobaca gene into two elite tomato breeding lines

Osei¹,

Danquah²,

Adu-Dapaah³

et al. 2022

Front. Hortic.

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Tomato is one of the most important vegetable crops cultivated and consumed worldwide. Demand is increasing daily because of increase in per capita fresh fruit consumption. Despite the economic importance of tomato, it has relatively short shelf-life after ripening and experiences remarkable post-harvest losses. This study was aimed at using marker-assisted backcrossing (MABC) to transfer shelf-life gene (alc) into the genetic background of two elite Ghanaian tomato breeding lines. The MABC derived lines at BC2F3 were evaluated to confirm selections using molecular markers. All the MABC-derived lines gave significant extended shelf life compared to the checks except for Alc-LA3134, the alc donor parent, which was, however, not significantly different from one of the backcrosses (BC2F2.3-E-80-19-26). This confirms that the genetic regulation of the shelf-life trait is dependent on the alc gene. The performance of the donor check (Alc-LA3134) against the 12 MABC-derived lines indicated no significant differences for the fruit firmness (except for BC2F2.3-E-80-19-4), number of locules per fruit and shelf life (for only BC2F2.3-E-80-19-26), thus suggesting similar backgrounds of the MABC as the recurrent parents. A considerable increase in the shelf-life value was observed among the MABC-derived lines. The introgression of the alc gene into cultivated tomatoes for extended shelf-life could reduce post-harvest losses of tomato in Ghana.

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“…To detect a true segregation distortion locus in closely related wheat varieties then would require population sizes large enough to detect much smaller selection strengths, as indicated in Fig 6, as well as replicate populations to confirm the effect on segregation is due to selection. An exception to this statement may be in the production of doubled haploid mapping populations, where differences in amenability to doubled haploidy between closely related varieties has the potential to produce segregation distortion that is stronger than in an SSD population structure [36].…”

Section: Discussionmentioning

confidence: 99%

Segregation distortion: Utilizing simulated genotyping data to evaluate statistical methods

et al. 2020

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Segregation distortion is the phenomenon in which genotypes deviate from expected Mendelian ratios in the progeny of a cross between two varieties or species. There is not currently a widely used consensus for the appropriate statistical test, or more specifically the multiple testing correction procedure, used to detect segregation distortion for high-density single-nucleotide polymorphism (SNP) data. Here we examine the efficacy of various multiple testing procedures, including chi-square test with no correction for multiple testing, falsediscovery rate correction and Bonferroni correction using an in-silico simulation of a biparental mapping population. We find that the false discovery rate correction best approximates the traditional p-value threshold of 0.05 for high-density marker data. We also utilize this simulation to test the effect of segregation distortion on the genetic mapping process, specifically on the formation of linkage groups during marker clustering. Only extreme segregation distortion was found to effect genetic mapping. In addition, we utilize replicate empirical mapping populations of wheat varieties Avalon and Cadenza to assess how often segregation distortion conforms to the same pattern between closely related wheat varieties.

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Cited by 34 publications

References 31 publications

Construction of SSR Based Genetic Linkage Map and Identification of QTLs Conferring CMD Resistance in Cassava

Construction of SSR Based Genetic Linkage Map and Identification of QTLs Conferring CMD Resistance in Cassava

Marker assisted backcrossing of alcobaca gene into two elite tomato breeding lines

Segregation distortion: Utilizing simulated genotyping data to evaluate statistical methods

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