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REGISTRATIONS OF GERMPLASMS

Registration of Tx714 Maize Germplasm Line

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

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

Tx714 maize (Zea mays L.) germplasm line (Reg. no. GP-371, PI 633840) was released in April 2003 by the Texas Agricultural Experiment Station (TAES) at College Station, TX, on the basis of its potential to produce high-yielding, yellow-grain hybrids. Tx714 is a B73 derivative with white cob and is adapted to the southern USA. It combines well with non-Iowa Stiff Stalk Synthetic (non-BSSS) lines. Tx714 hybrids have good agronomic and quality traits with superior or competitive grain yields compared with standard commercial hybrids.

Tx714 was developed by pedigree breeding and has a pedigree of [(K55/3*B73)-B-B-B)/B73]-1-B-B where B stands for bulk of selfs. K55 is a line from Kansas developed from "Pride of Saline" (Gerdes et al., 1993), and B73 was a popular BSSS line developed at Iowa State University from the BS13 population (Russell, 1972). The initial cross between K55 and B73 was made at the 1990 TAES summer nursery at College Station. Subsequent selections in the backcross populations and selfing generations were made at College Station on the basis of cob color, maturity, grain color, endosperm texture, lodging, and plant characteristics. After fixation, Tx714 was increased either by sibmating or by bulking selfed ears.

Tx714 has characteristics similar to B73, such as good seed-parent yields, stalk quality, small tassel, and good combining ability. Tx714 has a white cob and has harder endosperm and greater vigor than B73. Tx714 flowers about 1 to 2 d later than B73 at College Station. Tx714 ears have 16 to 18 rows of light yellow and dent kernels. Plants are tall with intermediate ear placement and dark green color. Adult plant leaves are erect above the ear. Tx714 has poor husk cover and it is susceptible to corn earworm (Helicoverpa zea Boddie) and southwestern corn borer (Diatraea grandiosella Dyar). Tassels are erect, short, fragile, and have few branches. Tx714 is an intermediate pollen shedder. On the basis of whole-grain analysis it averages about 130 mg g^–1 protein, which is 15% higher than standard commercial hybrids. Tx714 is susceptible to preharvest aflatoxin contamination produced by Aspergillus flavus Link:Fr.

Tx714 has an excellent combining ability with non-BSSS lines, producing hybrids with high yield potential, especially in combination with Tx772, an Argentine hard-endosperm line under irrigated conditions (Llorente et al., 2004). Tx714/Tx772 was ranked among the top three yielding hybrids in the Texas Corn Performance and Food Corn Performance Tests under irrigated conditions from 1996 to 2001 (Pietsch et al., 1998, 1999a, 1999b, 2000, 2001). In these tests, Tx714/Tx772 had similar or superior yields compared with commercial hybrids such as Pioneer Brand 3223, 31B13, Asgrow hybrid RX897, and Dekalb hybrids DK668 and DK687. Tx714/Tx772 has harder, flintier endosperm than most current commercial hybrids. This, together with a white cob, is a desirable trait for the food corn industry because hard and vitreous endosperm could result in larger grits during dry milling and less susceptibility to insect and diseases.

Seed of Tx714 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 TAMU Corn Breeding Program, Crop Testing Program, Cereal Quality Lab, and Research Stations staff involved in testing this line.

NOTES

Registration by CSSA.

Accepted for publication October 31, 2003.

REFERENCES

• Gerdes, J.T., C.F. Behr, J.G. Coors, and W.F. Tracy. 1993. Compilation of North American maize breeding germplasm. CSSA, Madison, WI.
• Llorente, C., F.J. Betrán, A. Bockholt, and F. Fojt, III. 2004. Registration of Tx772 maize parental line. Crop Sci. 44:1036–1037, this issue.[Free Full Text]
• Pietsch, D., L.W. Rooney, E.L. Suhendro, L. Synatschk, F.J. Betran, and F. Fojt, III. 1998. Texas food corn performance tests. Technical Report No. 98–06. Texas Agric. Exp. Stn., College Station, TX.
• Pietsch, D., L.W. Rooney, E.L. Suhendro, L. Synatschk, F.J. Betran, and F. Fojt, III. 1999a. 1999 Texas food maize performance tests. Technical Report No. 1999–26. Texas Agric. Exp. Stn., College Station, TX.
• Pietsch, D. L., Synatschk, F.J. Betran, and F. Fojt III. 1999b. 1999 Maize Performance Tests in Texas. Technical Report No. 1999–25. Texas Agric. Exp. Stn., College Station, TX.
• Pietsch, D., L., Synatschk, F.J. Betran, and F. Fojt III. 2000. 2000 Corn Performance Tests in Texas. Technical Report No. 2001–01. Texas Agric. Exp. Stn., College Station, TX.
• 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., F.J. Betran, C. Coffman, and K. Mayfield. 2001. 2001 Corn Performance Tests in Texas. Technical Report No. 2002–01. 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.
• Russell, W.A. 1972. Registration of B70 and B73 parental lines of maize. Crop Sci. 12:721.[Free Full Text]

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