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REGISTRATION OF CULTIVARS

Registration of ‘Loda’ Soybean

Dep. of Crop Sciences, and USDA-ARS, Univ. of Illinois, 1102 S. Goodwin, Urbana, IL 61801

Corresponding author (cnickell{at}uiuc.edu)

‘Loda’ soybean [Glycine max (L.) Merr.] (Reg. no. CV-423, PI 614088) was developed by the Illinois Agricultural Experiment Station at the University of Illinois. It was released in August 2000 because of its resistance to the soybean cyst nematode (SCN) (Heterodera glycines Ichinohe) derived from PI 88788 through the cultivar Jack (Nickell et al, 1990) and higher yield compared with SCN-resistant cultivars of similar maturity. The name Loda was selected to represent an area where SCN is a problem in central Illinois.

Loda originated as an F₄ plant selection from the cross of Jack x ‘IA3003’ made at the Illinois Agricultural Experiment Station. The cross was made in the field in the summer of 1992, and the F₁ generation was grown in the field in 1993. The F₂ and F₃ generations were advanced by single-pod bulk method in Puerto Rico during the winter of 1993 to 1994, and the F₄ generation was grown at Urbana in the summer of 1994. In the greenhouse during the winter of 1994 to 1995, progeny from single plants selected in the summer of 1994 were evaluated for resistance to Races 3 and 4 of SCN and resistance to Races 1 and 3 of Phytophthora rot (caused by Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann). The F₅ generation was grown as 1-m plant rows in 1995. Single plant rows were selected, composited, and evaluated in replicated yield trials in Illinois, during 1996 to 1999. Loda was evaluated as LN95-5414 in the Uniform SCN II Test in 1998 and 1999, the Northern Regional Soybean Cyst Nematode Test in 1999 (Cary and Diers, 1999), and in the Uniform Northern Regional Test in 1999 (Wilcox, 1999).

Loda is an indeterminate line classified as Group II maturity (relative maturity 2.1) maturing the same as ‘IA2036,’ 1 d later than ‘IA2021,’ and 3 d earlier than ‘Dwight’ (Nickell et al, 1998). Compared with IA 2021 at 10 locations without SCN, Loda was 5% higher in seed yield. Compared with IA 2021 at 17 SCN-infested locations, seed yield of Loda was 29% higher (2984 kg ha^-1 vs 3837 kg ha^-1). When compared with IA2021 at 27 locations, Loda was 5 cm taller, and had 12 g kg^-1 higher seed protein (405 g kg^-1 vs 417 g kg^-1).

Loda has purple flowers, gray pubescence, brown pods at maturity, and dull yellow seeds with gray hila. It may have up to 2% other types. Loda is susceptible to Phytophthora rot (Races 1, 5, 7, 25, and 30), brown stem rot [caused by Phialophora gregata (Allington & D.W. Chamberlain) W. Gams], and sudden death syndrome [caused by Fusarium solani (Mart.) Sacc.]. When evaluated against SCN in the greenhouse, Loda is resistant to races 2, 3, and 4 and moderately resistant to races 1, 5, and 14.

Seed production is restricted to Foundation and Certified classes beyond Breeder seed. Foundation seed of Loda will be available to qualified certified seed producers in Illinois and Canada for 2001 planting. A research and development fee of $0.70 per 50-lb unit (22.7 kg) of certified seed will be collected. A small sample of seed of Loda may be obtained from the corresponding author for research purposes, including development and commercialization of new cultivars, for at least five years. It is requested that appropriate recognition be made if Loda contributes to the development of new cultivars, germplasm, parental line, or genetic stock. U.S. plant variety protection of Loda will not be applied for.

NOTES

Contribution from the Illinois Agric. Exp. Stn., Urbana. Research supported in part by the Illinois Soybean Checkoff Board. Registration by CSSA.

Accepted for publication September 30, 2000.

REFERENCES

• Cary, T.R., and B. Diers. 1999. Northern regional soybean cyst nematode test report Group I–IV:1999. Univ. of Illinois, Urbana, IL.
• Nickell, C.D., G.R. Noel, T.R. Cary, and D.J. Thomas. 1998. Registration of ‘Dwight’ soybean. Crop Sci. 38:1396.[Free Full Text]
• Nickell, C.D., G. Noel, D.J. Thomas and R. Waller. 1990. Registration of ‘Jack’ soybean. Crop Sci. 30:1365.[Free Full Text]
• Wilcox, J.R. 1999. The Uniform Soybean Tests-northern states: 1999. USDA-ARS, West Lafayette, IN.

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