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USDA-ARS, Crop Genetics and Breeding Research Unit, P.O. Box 748, Tifton, GA 31793-0748
* Corresponding author (nwidstro{at}tifton.cpes.peachnet.edu)
GT-HID9, a maize (Zea mays L.) germplasm population (Reg. no. GP-366, PI 614805) was released by the USDA-ARS and the University of Georgia Coastal Plain Experiment Station in March 2000. It was released as a source of high in vitro dry matter digestibility (IVDMD) in southern-adapted germplasm.
GT-HID9 was developed using restricted recurrent phenotypic selection (RRPS) (Burton, 1974, 1982) within a population derived by random mating of the hybrid Coker 77B. GT-HID9 is a result of nine cycles of RRPS for IVDMD and forage yield with equivalent selection pressure for both traits using rank sums as the criterion for 20% selection of 80 recombined ear-rows grown for evaluation each cycle. Entries for evaluation of the random mated Coker 77B population (C0) consisted of 80 selfed ears from that population plus a check, and entries in subsequent cycles were ear-rows obtained by pollinating five ears within each of the 16 selected ear-rows with bulked pollen from those 16 ear-rows. The 80 entries and C0 were evaluated each cycle in a 9 x 9 balanced lattice square with five replications (Burton and Fortson, 1965).
GT-HID9 has white cobs and yellow kernels with good grain quality. The plants of GT-HID9 vary in maturity from AES1100 to AES1200 with no change from the original Coker 77B derived population in average maturity. Plants average about 2 m in height, and ear height averages about 1 m. Dry matter yields of GT-HID9 exceed the C0 by more than 2 Mg ha-1 after nine cycles of RRPS. IVDMD exceeds the original random mated population by 1.1% after nine cycles of selection and exceeds the source hybrid Coker 77B by 1.2%.
Seed of GT-HID9 has been deposited in the National Seed Storage Laboratory at Fort Collins, CO, and in the Maize Active Collection at the Plant Introduction Research Unit at Ames, IA. Seed of GT-HID9 will also be distributed in 100 g lots upon written request to the Crop Genetics and Breeding Research Unit, USDA-ARS, P.O. Box 748, Tifton, GA 31793-0748. It is requested that appropriate recognition be given if this germplasm contributes to the development of a new breeding line or hybrid.
NOTES
G.W. Burton (retired). Registration by CSSA.
Accepted for publication May 31, 2001.
REFERENCES
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