Evaluation of Maize Backcross Lines Derived from Tripsacum Germplasm. (C01-maas409763-poster)
Authors:
D.L. Maas* - U.S.D.A.-A.R.S, Woodward, Oklahoma C.L. Dewald - U.S.D.A.-A.R.S, Woodward, Oklahoma T.L. Springer - U.S.D.A.-A.R.S, Woodward, Oklahoma
Abstract:
Maize improvement requires hybridizations within the genus and occasionally between distantly related genera for genetic variation. An inter-generic cross between an eastern gamagrass hybrid [Tripsacum dactyloides (L.) L. x T. floridanum (Porter ex Vassey)] and a popcorn (Zea mays L.) pollinator produced a single individual with a combined genome. This plant possesses 28 chromosomes; 18 received from gamagrass and 10 from maize. The original F 1 hybrid was backcrossed four times with maize lines to produce an individual (BC4 ) possessing the nuclear genome of maize and extra nuclear genes from Tripsacum ssp. The BC4 line was further backcrossed with 12 separate inbred maize lines.
Four advanced lines each of field corn, sweet corn and popcorn were produced for testing. All gamagrass derived maize lines were crossed with commercial inbred lines creating numerous hybrid seed lines. Replicated multi-state testing of the hybrid corn lines in Oklahoma, Indiana, Florida, Kansas, Texas, Nebraska and Missouri provided information on performance within several environments during 2002. Several of the hybrid lines out performed commercial varieties during the 2002 growing season in the Midwest. One hybrid line yielded 13550 kg ha-1 compared to a commercial variety check line of 12200 kg ha-1 at Texline, Texas. Harvest results showed a yield of 15090 kg ha-1 for a separate hybrid in Garden City, Kansas vs. 10535 kg ha-1 for the standard check.
Speaker Information: David Maas, U.S.D.A.-A.R.S, Woodward, Oklahoma, 2000 18th Street, Woodward, OK 73801; Phone: (580)256-7449; E-mail: [email protected]
Session Information: Monday, November 3, 2003, 4:00 PM-6:00 PM Presentation Start: 4:00 PM (Poster Board Number: 605)
