Registration of ‘Titan’ Soybean

Titan' soybean [Glycine max (L.) Merr.] (Reg. no. CV-400, PI 608438) was developed by the Michigan Agricultural Experiment Station. It was released in February 1998 because of its high yield potential compared with other cultivars of a similar maturity and its partial resistance to sclerotinia stem rot [caused by Sclerotinia sclerotiorum (Lib.) de Bary]. Titan, originally tested as E93147, is an F4-derived line selected from the cross E86067 x 'Kenwood' (1). E86067 is an experimental line developed by Michigan State University that has the pedigree A80-145015xA79-135010.A80-145015has the pedigree ('Corsoy' x 'Wayne') x Peterson '118-11' (2,3), with Peterson 118-11 having the pedigree Corsoy x ('Hawkeye' x 'Chippewa') (4,5). A79-135010 was derived from the cross Pride 'B216' x 'Cumberland' (6). Pride B216 was developed from the cross Corsoy x Wayne. The cross between E86067 and Kenwood was made during the summer of 1989 in East Lansing, MI. The F, was grown the following summer, and the F2 and F3 plants were grown in Belize during the winter of 1990-1991. The F4 plants were grown during the summer of 1991 in East Lansing and were individually threshed to composite F4-derived lines. Titan was selected based on yield and visual ratings as an F4.5 line in 1992 at East Lansing. Further yield evaluations of Titan were conducted in Michigan from 1993 to 1997. Titan was evaluated in the Preliminary Test I of the Uniform Soybean Tests-Northern Region Test (7) in 1995 and the Uniform Test I in 1996 and 1997. Titan is an indeterminate cultivar with a late Group I maturity and is best adapted to 42° to 44° N lat. In the 1996 to 1997 Uniform Soybean Test I, the maturity of Titan was 4 d later than 'Parker' (8) and 1 d earlier than 'Marcus 95'. Marcus 95 was developed by backcrossing the Rpsl-k and Rps6 genes into 'Marcus' (9). The seed yield of Titan was similar to Marcus 95 and 5% greater than Parker. Titan has better lodging scores than either Marcus 95 or Parker. The seed quality score of Titan is similar to Parker and is better than Marcus 95. The plant height of Titan is similar to Marcus 95 and is 10 cm less than Parker. Compared with Marcus 95, the seed of Titan is 5 mg seed" larger, the protein content is 8 g kg" less, and oil content is 4 g kg" less. Compared with Parker, the seed of Titan is 3 mg seed larger, the protein content is 9 g kg" less, and oil content is similar. Titan has purple flowers, tawny pubescence, brown pods at maturity, and yellow seeds with black hila. Titan does not have a major gene conferring resistance to phytophthora rot (caused by Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann) and is susceptible to brown stem rot [caused by Phialophora gregata (Allington & D.W. Chamberlain) W. Gams]. Titan has partial resistance to sclerotinia stem rot. Application for U.S. plant variety protection will be made for Titan, which will permit only Foundation and Certified classes beyond breeder seed. A small sample of seed for research purposes can be obtained from the corresponding author for at least five years.