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GrainGenes Gene Report: Sd2 (Lophopyrum)

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Gene	Sd2 (Lophopyrum)
Gene Class	Gametocidal activity
Reference	Zhang W et al. (2005) Molecular characterization of durum and common wheat recombinant lines carrying leaf rust resistance (Lr19) and yellow pigment (Y) genes from Lophopyrum ponticum Theoretical and Applied Genetics 111:573-582. [ Show all 7 ]
URL	Sd2 gene at Komugi: Catalogue of Gene Symbols for Wheat
Chromosome	7BL Prins R et al. (1997) A study of modified forms of the Lr19 translocation of common wheat. Theoretical and Applied Genetics 95:424-430.
Germplasm	Hexaploid stock 88M22-149 Prins R and Marais GF (1999) A genetic study of the gametocidal effect of the Lr19 translocation of common wheat. South African Journal of Plant and Soil 16:10-14.
Comment	Zhang et al (2005) questioned the existence of this gene and alternatively suggest a duplication or deletion event influencing the transmission. A segment earlier believed to be derived from Thin distichum (Marais, 1990; 1992) is probably the same as that from Thin elongatum (Prins et al., 1996). In the presence of both Sd1 and Sd2, Lr19 is transmitted preferentially in heterozygotes, the degree of distortion being determined by genetic background. In heterozygotes with the same background, and in the presence of only Sd2, Lr19 shows strong self-elimination. Based on these results, it seems likely that the Sears' translocation 7D-7Ag#7 does not carry Sd1 (Prins and Marais, 1999). Genes with gametocidal activity, Sd1 (Zhang and Dvorak, 1990) and Sd2 (Prins and Marais, 1999), in wheat are present in homoeologous group 7 chromosomes of Thinopyrum elongatum (Kibirige-Sebunya and Knott, 1983; Zhang and Dvorak, 1990).
Info Source	McIntosh RA et al. (2013) Catalogue of Gene Symbols for Wheat- 2013 Edition Catalogue of Gene Symbols for Wheat.
Data Curator	Cooper, Laurel Feb-2021

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