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Crop Science 41:588 (2001)
© 2001 Crop Science Society of America

REGISTRATION OF CULTIVARS

Registration of ‘Croton 3.9’ Soybean

R.L. Coopera, R.J. Martina,d, S.K. St. Martind, A. Calip-Duboisd, R.J. Fiorittob and A.F. Schmitthennerc

a USDA-ARS and Dep. of Horticulture & Crop Science, Ohio Agric. Res. and Development Ctr. (OARDC), Wooster, OH 44691
b Dep. Horticulture & Crop Science, Ohio Agric. Res. and Development Ctr. (OARDC), Wooster, OH 44691
c Dep. of Plant Pathology, Ohio Agric. Res. and Development Ctr. (OARDC), Wooster, OH 44691
d Dep. of Horticulture & Crop Science, OARDC, The Ohio State Univ., Columbus, OH. 43210

Corresponding author (cooper.16{at}osu.edu)

‘Croton 3.9’ soybean [Glycine max (L.) Merr.] (Reg. no. CV-422, PI 614153) was developed jointly by the USDA Agricultural Research service and the Ohio Agricultural Research and Development Center. It was released 1 September, 1997, as a tall, drought tolerant, indeterminate cultivar with specific adaptation to stress (primarily drought) prone environments, where its vigorous vegetative growth results in adequate plant height for good yields (Cooper, 1989; Cooper, 1994; Walker and Cooper, 1982).

Croton 3.9 is a F4-derived line, originally designated as HC89-2232, from the cross HC80-1944 x Asgrow 3127(Asgrow Seed Company, Des Moines, IA). HC80-1944 is a determinate semidwarf breeding line from the cross of L73U632 x Elf (Cooper, 1981). L73U632 is a determinate semidwarf line from the cross of Miller 67 x Williams (Bernard and Lindahl, 1972; Bernard et al, 1988). Miller 67 is a Maturity Group III determinate variety. Asgrow 3127 is from the cross, Williams x Essex (Bernard and Lindahl, 1972; Smith and Camper, 1973). The cross of HC80-1944 x Asgrow 3127 was made in 1985, at the Ohio Agricultural Research and Development Center, Wooster, Ohio. The F4-derived line, HC89-2232, was tested at multiple Ohio locations from 1989 to 1992. It was evaluated in the Uniform Soybean Tests, Northern States, Preliminary Test IIIA in 1993 and the Uniform Test III in 1994, 1995, and 1996 (Wilcox, 1977).

Croton 3.9 has purple flowers, tawny pubescence, tan pods, and dull yellow seeds with black hilum. It is a maturity Group III (relative maturity 3.9), tall, indeterminate cultivar adapted to the central Midwest. It is very similar to the Maturity Group IV drought tolerant cultivar, Stressland (Cooper et al, 1999), but is 6 days earlier in maturity and similar in yield. Like Stressland, it was selected for its specific adaptation to stress prone environments. Compared to Macon (Nickell et al, 1966), a shorter, more broadly adapted cultivar, Croton 3.9 is 1 day later in maturity, 10 cm taller and more lodging susceptible. In favorable environments, Croton 3.9 and Macon are similar in yield but in drought prone environments, Croton 3.9 has shown a height advantage of 15 to 20 cm and yield advantage of 10 to 20% (Wilcox, 1977). Croton 3.9 is recommended for stress (primarily drought) prone environments where shorter, more broadly adapted cultivars fail to reach adequate plant height for good yields. It has high tolerance to Phytophthora root rot (caused by Phytophthora sojae M.J. Kaufmann & J.W. Gerdemann).

Breeder seed of Croton 3.9 was distributed to foundation seed organizations in Maryland and Ohio for planting in 1997. Breeder seed of Croton 3.9 will be maintained by the Ohio Agricultural Research and Development Center, Wooster, OH 44691. Small quantities of seed for research purposes can be obtained from the corresponding author for at least five years.

U.S. Plant Variety Protection for Croton 3.9 will not be applied for.

NOTES

Research support was provided by the USDA-ARS and state and federal funds appropriated to the OARDC, Ohio State University. Manuscript no. 99-57. Registration by CSSA.

Accepted for publication September 30, 2000.

REFERENCES





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