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REGISTRATIONS OF PARENTAL LINES

Registration of Tx110 Maize

Soil and Crop Sciences Dep., Texas A&M University, College Station, TX 77843-2474

^* Corresponding author (javier-betran{at}tamu.edu)

Tx110, a maize (Zea mays L) parental line, (Reg. no. PL-312, PI 633838) was released February 2003 by the Texas Agricultural Experiment Station (TAES) at College Station, TX. This line was released for its utility in producing high-yielding, white food corn hybrids. Tx110 has white grain and cobs, southern U.S. adaptation, and combines well with subtropical or tropical white and non-Iowa Stiff Stalk Synthetic (non-BSSS) lines.

Tx110 was developed by pedigree breeding from the yellow grained line Tx6252 and has a pedigree of (Tx61M/5*Tx6252)-1-B-B-B where B stands for bulk of selfs. Tx110 is a white grain conversion of Tx6252 that resulted from plant selections in the BC₄ of Tx61M/Tx6252, with Tx61M, a white line developed from the variety Surcropper, as donor parent for white grain color. Tx6252 is a yellow line developed from a composite of Tx325 (developed from variety Yellow Surcropper) and seven corn belt inbreds (Gerdes et al., 1993). The initial cross between Tx61M and Tx6252 was made at College Station, TX, in 1989. Subsequent selections in the backcross populations and selfing generations were made at College Station on the basis of maturity, grain color, endosperm texture, lodging, and plant characteristics. After fixation, Tx110 has been increased either by sibmating or by bulking selfed ears.

Similar to its recurrent parent Tx6252, Tx110 has good seed-parent yield, acceptable stalk quality, compact tassel, and shows good combining ability. Unlike its recurrent parent, Tx110 has white grain, white cob, harder endosperm, and greater vigor. Tx110 flowers about 3 d later than B73 at College Station. Tx110 ears are long with 14 to 16 kernel rows. Kernels are deep, dent, and white. Plants are as tall as B73 with intermediate to high ear placement. Tx110 is susceptible to corn earworm (Helicoverpa zea Boddie) and southwestern corn borer (Diatraea grandiosella Dyar). Tx110 is a good pollen shedder and has good anthesis-silking synchronization.

Tx110 has been evaluated in hybrid combinations with other white lines. Tx110 combines well with non-Stiff Stalk lines (e.g., Tx130), and subtropical and tropical white lines (e.g., CML373, CML379, CML343). Tx110 hybrids have had similar or superior grain yields as commercial white hybrids such as Pioneer Brand 32H39 and 30G40, and Asgrow hybrids RX953W and RX949W in the Texas food corn performance tests (Pietsch et al., 2000, 2001). Tx110 had one of the highest general combining ability values for grain yield in a diallel among 12 elite white lines and favorable expression for silking date, ear height, stalk lodging, grain moisture content, and test weight (Transue et al., 2002). Hybrids Tx110/CML311 and Tx110/CML322 were among the highest yielding hybrids across six Texas locations.

Tx110 is susceptible to preharvest aflatoxin contamination produced by the fungus Aspergillus flavus Link:Fr. Tx110 hybrids have shown differential response to aflatoxin accumulation. Tx114/Tx110 and Tx110/CML311 were among the most susceptible hybrids to aflatoxin among subtropical and temperate white hybrids (Betrán et al., 2002). Conversely, Tx110/CML269 and Tx110/CML78 had the lowest aflatoxin accumulation across environments, significantly lower than some commercial food corn hybrids (e.g., Pioneer Brand 32H39 and Asgrow RX949W).

Seed of Tx110 may be obtained from the corresponding author at the Department of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843-2474.

ACKNOWLEDGMENTS

This research was supported in part by the Texas Corn Producers Board. We acknowledge the support of the Cereal Quality Lab, and Research Stations staff involved in testing this line.

NOTES

Registration by CSSA.

Accepted for publication October 31, 2003.

REFERENCES

• Betrán, F.J., T. Isakeit, D. Transue, K. Mayfield, S. Bhatnagar, D. Makumbi, R. Ganunga, and D. Pietsch. 2002. Response of white food corn to aflatoxin accumulation. In Proc. of the 15th Aflatoxin Elimination Workshop, San Antonio, TX. 23–25 Oct. 2002.
• Gerdes, J.T., C.F. Behr, J.G. Coors, and W.F. Tracy. 1993. Compilation of North American maize breeding germplasm. CSSA, Madison, WI.
• Pietsch, D., L.W. Rooney, E. Riley, L. Synatschk, F.J. Betran, and F. Fojt, III. 2000. 2000 Texas food corn performance tests. Technical Report No. 2001–03. Texas Agric. Exp. Stn., College Station, TX.
• Pietsch, D., L.W. Rooney, D. Gualberto, J. Owen, F.J. Betran, and K. Mayfield. 2001. 2001 Texas food corn performance tests. Technical Report No. 2001–03. Texas Agric. Exp. Stn., College Station, TX.
• Transue, D., F.J. Betran, and S. Bhatnagar. 2002. Heterotic response of subtropical & tropical maize yellow inbreds across environments. In Agronomy Abstracts. ASA, Madison, WI.

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