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a Dep. of Agronomy, Iowa State Univ., Ames, IA 50011
b USDA-ARS, Corn Insects and Crop Genetics Res. Unit, Ames, IA 50011
* Corresponding author (hallauer{at}iastate.edu)
Inbred B115 (Reg. no. PL-304, PI 615190) is a yellow dent maize (Zea mays L.) line developed cooperatively by the Iowa Agriculture and Home Economics Experiment Station and USDA-ARS. The line was released in April 2000 because of its potential value as a source of germplasm in pedigree-selection breeding programs.
B115 was derived from BS11(FR)C9, a strain of BS11 that had undergone nine cycles of reciprocal full-sib selection with BS10 the tester for BS11 (Eyherabide and Hallauer, 1991). BS11 is a selected strain of Pioneer Two-ear Composite (Hallauer, 1967). B115 was developed from one of the lines [BS11(FR)C9-3227-9] that was included in the intermatings that formed BS11(FR)C10. The line was evaluated in testcross with B73 at the S2 generation. On the basis of testcross performance, the line was advanced ear-to-row by seven generations of self-pollination in a breeding nursery and included in a crossing nursery to produce single-cross seed with B73, B104, B105, B109, and H123. Single crosses that included B115 as one parent were evaluated in two-replication trials in 1996 (3 locations), 1997 (4 locations), 1998 (9 locations), and 1999 (12 locations) with commercial check hybrids (2 to 4) included in each trial. Average data across years and locations showed that single crosses that included B115 (89.1 q ha-1) had yields similar to the check hybrids (87.4 q ha-1), similar root (8.1 vs. 5.3%) and stalk (8.2 vs. 5.1%) lodging, and similar ear droppage (0.0 vs. 0.3%), but B115 single crosses had significantly greater grain moisture (24.2 vs. 19.8%) at harvest.
B115 is a vigorous line that has above average resistance to first- and second-generation European corn borer (Ostrinia nubilalis Hübner) and early infection by common corn rust (caused by Puccinia sorghi Schw.), gray leaf spot (caused by Cercospora Zeae-maydis Tehon and Daniels), and northern corn leaf blight (caused by Exserohilum turcicum Pass.). B115 has a light, green plant color and tends to produce more than one ear per plant. Plant and ear heights of B115 are similar to B73 and Mo17, but hybrids with B115 have greater grain moisture at harvest; i.e., a slower rate of grain drying. B115 has light, yellow, semi-dent kernels. Seed yield of B115 is similar to Mo17, but seed size is similar to B73. Ears of B115 have 16 kernel rows, have ear lengths intermediate to B73 and Mo17, and have ear diameters similar to Mo17. B115 performs better in crosses with lines derived from Iowa Stiff Stalk Synthetic. Maturity classification is AES 700-800.
Seed of B115 is maintained by the Iowa Agriculture and Home Economics Experiment Station and is distributed upon request (100 seeds per request) by the Committee for Agriculture Development, 133 Curtiss Hall, Iowa State University, Ames, IA 50011-1050.
NOTES
Joint contribution from Corn Insects and Crop Genetics Research Unit, USDA-ARS and the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA as Journal Paper No. J-19138. Project 3742. Registration by CSSA.
Accepted for publication May 31, 2001.
REFERENCES
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