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A new locus for early maturity in soybean

Cober, E.R., Molnar, S.J., Charette, M., Voldeng, H.D. (2010). A new locus for early maturity in soybean, 50(2), 524-527.


The genetic model for maturity in soybean [Glycine max (L.) Merr.] is a series of near-isogenic lines, but they do not span the natural variation for early maturity. The objectives of this study were to determine if a single gene in OT98-17 controls early maturity and if this is a new locus. A cross was made between 'Maple Presto' and OT98-17, an early-maturing Maple Prestoderived backcross line. A total of 201 F3 progeny rows from this population and Maple Presto were grown at Ottawa, ON, in 1999. In 2000, F4 progeny rows were grown and 150 late-maturing and 51 early-maturing families were observed to fit a 3:1 ratio (n = 201, X2 = 0.01, P = 0.90). The early-maturing allele was transferred to a 'Harosoy' background, and isolines were grown from 2002 to 2006 at Ottawa, ON. The isolines were 9 and 6 d earlier maturing in Maple Presto and Harosoy backgrounds, respectively. To deter-mine the independence of this locus, simple sequence repeat molecular markers were used to identify three candidate regions. The gene E8 specifically mapped to linkage group C1 between Sat_404 and Satt136. No other maturity gene has been mapped to this region. The two other candidate regions were both related to maturity quantitative trait loci on molecular linkage group L and may be inadvertently selected along with early maturity. The gene symbol E8e8 has been assigned by the Soy-bean Genetics Committee. E8E8 results in later maturity and e8e8 results in early maturity. The earliest Harosoy maturity isoline is now rated as maturity group 000. © Crop Science Society of America.

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