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REGISTRATIONS OF GERMPLASMS

Registration of Tx745 Maize Germplasm Line

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

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

Tx745 maize (Zea mays L.) germplasm line (Reg. no. GP-373, PI 633842) was released April 2003 by the Texas Agricultural Experiment Station at College Station, TX. Tx745 is yellow-grained, white-cobbed (pp), and southern U.S. adapted line that combines well with both Iowa Stiff Stalk Synthetic (BSSS) and non-BSSS lines.

Tx745 is an F₆ derived line developed by pedigree breeding from a popular hybrid grown in the southern U.S., Pioneer Brand 3165. The pedigree of Tx745 is P3165-1-8-1-1-1-B-B-B where B stands for bulk of selfs. The first selfing was made at TAES summer nursery at College Station, TX, in 1988. Subsequent selections within selfing generations were made at College Station on the basis of maturity, short plant height, grain yield, endosperm texture, lodging, and other plant characteristics.

Tx745 flowers about the same time as B73 at College Station, which is early compared with flowering times of other southern adapted lines. Tx745 ears have 14 to 16 rows of semident and light yellow kernels. Plants are short with low ear placement and excellent stalk quality. Adult plant leaves are erect above the ear and commonly show light yellow stripes. Tassels are small and erect. Tx745 is an intermediate seed parent and pollen shedder with good anthesis-silking synchronization. Tx745 is susceptible to aflatoxin accumulation in grain.

Tx745 combines well with both BSSS and non-BSSS lines. Tx745 has combined well with Tx714 (Betrán et al., 2004), Tx601Y (Gerdes et al., 1993), and Tx772 (Llorente et al., 2004), producing hybrids with grain yield comparable with hybrids such as Pioneer Brand 3223 and 31B13, and Dekalb DK668 in 2001. Tx745 combines well with late tropical and subtropical yellow lines producing hybrids of intermediate maturities and short plant heights.

Seed of Tx745 may be obtained from the corresponding author at the Department of Soil and Crop Sciences, Texas A&M University, College Station, TX77843-2474.

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

• Betrán, F.J., A. Bockholt, F. Fojt, III, K. Mayfield, and D. Pietsch. 2004. Registration of Tx714 maize parental line. Crop Sci. 44: add page numbers), this issue.
• 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]

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