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REGISTRATIONS OF GERMPLASMS

Registration of Tx770 Maize Germplasm Line

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

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

Tx770 maize (Zea mays L.) germplasm line (Reg. no. GP-374, PI 633843) was released April 2003 by the Texas Agricultural Experiment Station (TAES) at College Station, TX. Tx770 has yellow grain, white cobs, southern U.S. adaptation, and combines well with both Iowa Stiff Stalk Synthetic (BSSS) and tropical or subtropical lines.

Tx770 is a BC₁F₈ developed by pedigree selection from the cross of Mo17 (Zuber, 1973) and Tx601Y (Gerdes et al., 1993). Tx770 has a pedigree of (Tx601/2*Mo17)-1-2-1-1-1-1-1-B-B where B stands for bulk of selfs. The initial cross was made at the TAES summer nursery at College Station in 1987. Subsequent backcross to Mo17 and selections in selfing generations were made at College Station on the basis of maturity, plant characteristics, and grain appearance.

Tx770 is a good seed parent with excellent stalk quality. Tx770 flowers about 3 d later than Mo17 and 7 d earlier than Tx601Y in College Station. Tx770 ears have 14 to 16 of light yellow, semiflint kernel rows. Plants are shorter than B73 with intermediate ear placement. Tassels are erect and frequently have only one or two branches. Tx770 has intermediate pollen shed and good anthesis-silking synchronization. Tx770 is susceptible to common smut [caused by Ustilago zeae (Beckm.) Unger = U. maydis (DC.) Corda], corn earworm (Helicoverpa zea Boddie), and southwestern corn borer (Diatraea grandiosella Dyar).

The hybrid Tx770/LH236 had grain yield equal with commercial hybrids such as Pioneer Brand 3223 and 31B13, and Dekalb DK668 at Granger, TX in 2000. Aflatoxin accumulation in grain for Tx770 hybrids has been variable and is dependent upon the environment. Hybrid Tx770/CML325 was among the less contaminated hybrids evaluated in plots inoculated with Aspergillus flavus Link:Fr. at College Station and Weslaco, TX, in 2001 (Betrán et al., 2002a). Tx770 was among the less susceptible lines and not different (P = 0.05) from the most resistant lines at Weslaco, TX in 2001 and 2002 and at College Station in 2002 (Betrán et al., 2002b).

Seed of Tx770 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. 2002a. Maize germplasm evaluation for aflatoxin resistance in Texas. Mycopathologia 155:81.
• Betrán, F.J., T. Isakeit, G. Odvody, and K. Mayfield. 2002b. Aflatoxin accumulation in maize inbreds and hybrids. In Proc. of the Aflatoxin/Fumonisin Workshop 2002, 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.
• Zuber, M.S. 1973. Registration of 20 maize parental lines. Crop Sci. 13:779–780.[Free Full Text]

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