Thirtyseven f3 families derived from the cross w364. Genetic variation was detected for all of the traits, and transgressive segregation was a common phenomenon. Transgressive segregation an overview sciencedirect topics. Detection of quantitative trait loci for seed size traits. Materials and methods plant materials seeds of soybean pi 567516c were obtained from soybean germplasm collection, usdaars, urbanachampaign, il courtesy of randall nelson, soybean curator for making crosses. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Hybrid offspring generally possess traits or characteristics seen in ancestral species, which are expected to be. Quantitative inheritance in plant breeding transgressive segregation plants with traits that arise by segregation of genes for a quantitative. A simple pedigree and then pedigree plus backcross system was used that allowed us to look at the f 3 and bc 1f 2 generations following the cross of tamcot 22tam b 18233 elsu, 06 we 624tamcot 22, and tamcot 2204 sid 842. Construction of highdensity genetic map and qtl mapping of yieldrelated and two quality traits in soybean rils population by radsequencing. Seed starch content ssc greatly affects the taste, flavour and processing properties of soy foods. The discussion was closed on 17 november 2009 with a consensus to merge. Transgressive phenotype was nominated for deletion.
Transgressive segregation, adaptation and speciation heredity. The wild species of chickpea have tremendous potential for enhancing genetic gains of cultigen and have resistant accessions against major biotic and abiotic stresses. Factors affecting isoflavone content in soybean seeds. These qtl were directly related to the appearance of transgressive individuals in the f2 for those traits which showed transgressive segregration.
Dec 01, 2004 increased oleate content of soybean glycine max l. Transgressive segregation for palmitic acid in seed oil of soybean. Transgressive segregation, adaptation and speciation. These crosses can derive highly resistant lines, even when both parents have a susceptible phenotype. Mapping quantitative trait loci for yieldrelated traits in. Jun 19, 2017 one of the overarching goals of soybean breeding is to develop lines that combine increased yield with improved quality characteristics. Mapping quantitative trait loci for tolerance to pythium.
As seen with the stb in kenya and riesebergs sunflowers, transgressive segregation can be used to create a species that is more adaptable and resistant in areas where there is environmental stress. The genetic architecture necessary for transgressive. Previously, a considerable number of observations of quantitative trait loci qtl for lodging resistance have been reported by. Crop science abstract transgressive segregation for. The dysfunction of e4 allele in miharudaizu is caused by an. Hamidreza dargahi, 1 patcharin tanya, 2 prakit somta, 2 jun abe, 3 and peerasak srinives, 2. Transgressive segregation of isoflavone contents under the control of four qtls in a cross between distantly related soybean varieties september 2010 breeding science 603. Transgressive segregation for palmitic acid in seed oil of soybean view my binders. Transgressive segregation in the progeny of the cross between mutant lines rg7 and rg2 further increases seed stearic acid to almost 18%, suggesting the presence of yet another gene having a significant effect on stearic acid accumulation.
Mapping quantitative trait loci controlling soybean seed. Transgressive segregation study in f population of four. A free powerpoint ppt presentation displayed as a flash slide show on id. Highdensitymarker qtl mapping can serve as an effective strategy to identify novel genomic information to facilitate crop improvement. Mapping quantitative trait loci for yieldrelated traits in soybean glycine max l. Mapping quantitative trait loci for yieldrelated traits. However, the same types of qtl with allelic effects opposite to those predicted by the parents were also observed for traits that did not display transgressive segregation in the f2. Pdf transgressive segregation in breeding of crop plants. Inheritance of resistance in soybean pi 567516c to ly1 nematode population infecting cv. Integration of lodging resistance qtl in soybean scientific. The objective in this study was to identify quantitative trait loci qtl for ssc in soybean. These transgressive segregants were successfully exploited in developing cultivars possessing combinations of various selected traits. For the contribution history and old versions of the redirected article, please see its history. Genetic gain for soybean seed protein, oil, and yield in a.
Agricultural industry business cultivars study and teaching seed crops genetic aspects soybean soybeans. Construction of highdensity genetic map and qtl mapping of. Transgressive segregation for oleate content in three soybean. Transgressive segregation appears to be ubiquitous in plant hybrids.
Overall, there was no transgressive segregation for fiber uniformity, elongation and short fiber content. Therefore, rrw may outperform rwi for disease evaluation in soybean. Transgressive segregation is the production of f2, backcross, or latergeneration hybrid progeny with phenotypes that can fall outside the phenotypic range of the parental populations or species from which they were derived. Nochowski, sixteen f3 families derived from the reciprocal cross, and the two parents were evaluated for free folic acid content ffac in two locations in wisconsin in 1994. This suggests that kamaishi17 possesses the same genotype e3e3e4e4 at the e3 and e4 loci as is the case in miharudaizu. Apr 25, 2019 poor lodging resistance could limit increases in soybean yield. Transgressive segregation was found to be more frequent in plants than in animals. Transgressive segregation for palmitic acid in seed oil of soybean wilcox 1994 crop science wiley online library. Hybridization, transgressive segregation, genetic covariation. Stearic acid is a saturated fatty acid and is found as part of conventional soybean seed oil, but represents only a very minor component of the total oil 3%. Transgressive segregation results from the recombination of these alleles at quantitative trait loci qtl, so that when they sum up, an extreme trait value arises in hybridsthat is, complementary gene action rieseberg et al. Oct 01, 2018 in our study, two qtl were identified using rrw. Transgressive segregation it is the formation of extreme phenotypes, or transgressive phenotypes, observed in segregated hybrid populations compared to phenotypes observed in the parental lines.
Genetic diversity and its use in soybean abe jun hokkaido university introduction cultivated and wild soybeans form a primary gene pool hymowitz, 2004. Transgressive segregation for oleate content in three. Inheritance of resistance in soybean pi 567516c to ly1. The 15 traits analyzed included reproductive, morphological, and seed traits, seed yield and carbon isotope discrimination ratios c12c. Transgressive segregation has also been observed for verticillium wilt resistance in an f 2. Transgressive segregation produces hybrid progeny phenotypes that exceed the parental phenotypes. Its contents were merged into transgressive segregation. A total in 169 recombinant inbred lines rils derived from a cross in williams 82 and pi 366121 were grown for three consecutive years. Transgressive segregation and reciprocal effect for free. Transgressive segregation was observed for both ril populations in this study, suggesting that the combination of genetic components from both parents could strengthen the tolerance to disease rieseberg et al.
Both usually produce fertile hybrids, and there is no marked obstacle to gene exchange, although the sterility due to abnormal chromosome pairing has often been observed. Hybrid offspring generally possess traits or characteristics seen in ancestral species, which are expected to be subdued or diluted when. Variation and transgressive segregation in the backcross. Pod dehiscence pd is relatively uncommon in modern north american soybean cultivars, but is often observed when unimproved germplasm or the wild species, g. The apparent lack of transgressive segregation in the f 2 generation was unexpected. Transgressive segregation is a very important phenomena where the segregating individual will possesses the value for a character which is exceeding the better parent. Transgressive segregation in the rils was shown for eight traits, suggesting that alleles with positive effects on the measured traits are distributed among the parents. We examined transgressive phenotypes of flowering time in rice, and revealed transgressive segregation in f2 populations derived from a cross between parents with similar proximal days to heading dth. Transgressive segregation was observed only for seed length based on combined data. The objective of this study was to determine if transgressive segregates for oleate content could be found in crosses between three midoleate lines. Transgressive segregations for agronomic improvement using. Transgressive segregation for palmitic acid in seed oil of. T here has been considerable interest in research and use of glandless cotton gossypium spp.
Such transgressive segregants were used as improved resistance sources in crop breeding ulloa et al. Folic acid is one of the ten essential vitamins in the human diet. Quantitative trait loci associated with cell wall polysaccharides in soybean seed. Mode of inheritance of promiscuous nodulation and combining. Warm temperatures or drought during seed maturation increase free. Tamcot 22 is a high yielding, average quality cultivar, tam b. Reducing levels of palmitic acid should enhance the nutritive value of soybean oil for. Transgressive phenotypes can be produced when alleles at multiple loci that originated in different parental populations recombine in the hybrids. Only three of 1 studies failed to report extreme phenotypes for at least one character, and of 579 traits examined. Transgressive segregation of isoflavone contents under the. Transgressive segregation was observed in all traits except for 100 seed weight. Transgressive segregation of isoflavone contents under the control of four qtls in a cross between distantly related soybean varieties. Pdf transgressive segregation of isoflavone contents. Pi 567516c is a maturity group iv soybean, with purple.
In the present study, two wild annual accessions, one each of c. Stearic acid has utility for industrial purposes and has recently been demonstrated to be largely free of the negative health effects noted for other saturated fats. It further suggests that a future qtl study on this population would likely reveal the genomic regions of these loci. Genetic properties responsible for the transgressive. A high degree of transgressive segregation was observed, with oil values greater than either parent.
The cross pk 416 vls 47 and t49 pk 472 showed high frequency of transgressive segregation for plant height in f 2 30 % and f 3. Pdf transgressive segregation of isoflavone contents under. However, a highly susceptible parent can contribute to nematode resistance via transgressive segregation wang et al. Palmitic acid is the major saturated fatty acid in soybean glycine max l. Unlike heterosis, extreme phenotypes caused by transgressive segregation are heritably stable. The parents were assumed to be homozygous at the major loci conditioning the.
The presence of transgressive segregants in backcross generations have also been reported for different characters in tomato franklin, 1987, grain sorghum rao et al. Genetic variation in soybean at the maturity locus e4 is. May 01, 2019 transgressive segregation produces hybrid progeny phenotypes that exceed the parental phenotypes. Nov, 2018 a high degree of transgressive segregation was observed, with oil values greater than either parent. One possible consequence is transgressive segregation, which produces hybrid phenotypes that exceed the phenotypic range of the parental species and which might be a common phenomenon. The soybean research is indexed in soybean abstract of cab international, uk and indian science abstracts of niscair, india financial assistance received from the indian council of agricultural research, the society for soybean research and development thankfully acknowledges the new delhi for printing of the journal. The objective of this study was to determine if transgressive segregates for oleate content could be found in crosses between three mid. Transgressive segregation creates an opportunity for new hybrid species to arise that are more fit than their ancestors. We examined transgressive phenotypes of flowering time in rice, and revealed transgressive segregation in f2 populations derived from a cross between parents with similar proximal days to. Transgressive segregation for resistance was observed within f2. Qtl analysis of transgressive segregation in an interspecific. Hybridization between members of conspecific populations and closely related species is common and has important evolutionary consequences.
A transgressive segregation factor rkn2 in gossypium. Poor lodging resistance could limit increases in soybean yield. Identification of quantitative trait loci, journal of heredity on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. In the present study transgressive segregants were studied in four crosses for scmrspad chlorophyll. Transgressive segregation for resistance also has been reported in other plantpathogen systems, such as soybean soybean cyst nematodes winter et al. In addition, the greater variance for ndw in the promiscuous parent p 2 versus the variance in the f 2 generation was unexpected in presumably homozygous parental populations. Reducing levels of palmitic acid should enhance the nutritive value of soybean oil for human consumption.
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