Identification and characterization of segregation distortion loci along chromosome 5B in tetraploid wheat |
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Authors: | Sunil Kumar Bikram S Gill Justin D Faris |
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Institution: | (1) Department of Plant Sciences, Loftsgard Hall, North Dakota State University, Fargo, ND 58105, USA;(2) Department of Plant Pathology, 4024 Throckmorton Plant Sciences Center, Kansas State University, Manhattan, KS 66506, USA;(3) USDA-ARS Cereal Crops Research Unit, Northern Crop Science Laboratory, 1307 18th Street North, Fargo, ND 58105, USA |
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Abstract: | Segregation distortion genes are widespread in plants and animals and function by their effect on competition among gametes
for preferential fertilization. In this study, we evaluated the segregation distortion of molecular markers in multiple reciprocal
backcross populations derived from unique cytogenetic stocks involving the durum cultivar Langdon (LDN) and wild emmer accessions
that allowed us to study the effects of chromosome 5B in isolation. No segregation distortion of female gametes was observed,
but three populations developed to analyze segregation of male gametes had genomic regions containing markers with skewed
segregation ratios. One region of distortion was due to preferential transmission of LDN alleles over wild emmer alleles through
male gametes. Another region required the presence of LDN 5B chromosomes in the female for preferential fertilization by male
gametes harboring LDN alleles indicating that the corresponding genes in the female gametes can govern genes affecting segregation
distortion of male gametes. A third region of distortion was the result of preferential transmission of wild emmer alleles
over LDN alleles through male gametes. These results indicate the existence of different distorter/meiotic drive elements
among different genotypes and show that distortion factors along wheat chromosome 5B differ in chromosomal location as well
as underlying mechanisms. |
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Keywords: | Wheat Segregation distortion Gamete Meiotic drive Recombination |
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