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REGISTRATIONS OF GERMPLASMS

Registration of Tx732 Maize Germplasm Line

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

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

Tx732 maize (Zea mays L.) germplasm line (Reg. no. GP-372, PI 633841) was released in April 2003 by the Texas Agricultural Experiment Station at College Station, TX. Tx732 is a yellow-grain line with southern U.S. adaptation. It combines well with both non-Iowa Stiff Stalk Synthetic lines (non-BSSS) and tropical or subtropical lines.

Tx732 was derived by pedigree breeding as an F₈ line from the cross of Tx6252 (Gerdes et al., 1993) and B73 (Russell, 1972). The pedigree of Tx732 is (Tx6252/B73)-1-1-2-1-1-2-1-B-B where B stands for bulk of selfs. Individual plant selections were made at College Station on the basis of maturity, grain color, grain yield, endosperm texture, lodging, and plant characteristics. After seven generations of ear-to-row advance of selfed progeny, Tx732 was increased either by sibmating or by bulking selfed ears.

Tx732 flowers about 1 d earlier than B73 in College Station. Tx732 ears have 14 to 16 kernel rows and white cobs (pp). Kernels are light yellow and dent. Plants are shorter than B73 with intermediate ear placement and good stalk quality. Tassels are small and erect. Tx732 is an intermediate pollen shedder, a good seed parent, and has good anthesis-silking synchronization.

Tx732 has a good general combining ability, particularly with non-BSSS lines and subtropical or tropical yellow lines. Tx732 has combined well with (LH200/LH198), a BSSS tester, and CML285, producing hybrids with similar yield as commercial checks such as Pioneer Brand 3223 and 31B13, and Dekalb hybrid DK668. Tx732 is susceptible to corn earworm (Helicoverpa zea Boddie) and southwestern corn borer (Diatraea grandiosella Dyar). The response to aflatoxin accumulation of Tx732 hybrids under inoculation with Aspergillus flavus Link:Fr. has been variable. Hybrids Tx732/CML338 and Tx732/CML323 were among the less contaminated hybrids while hybrid Tx732/CML325 was among the most susceptible (Betrán et al., 2002).

Seed of Tx732 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

• Betrán, F.J., T. Isakeit, G. Odvody, and K. Mayfield. 2002. Maize germplasm evaluation for aflatoxin resistance in Texas. Mycopathologia 155:81.
• Gerdes, J.T., C.F. Behr, J.G. Coors, and W.F. Tracy. 1993. Compilation of North American maize breeding germplasm. CSSA, Madison, WI.
• Russell, W.A. 1972. Registration of B70 and B73 parental lines of maize. Crop Sci. 12:721.[Free Full Text]

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