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United States Department of Agriculture

Agricultural Research Service

Research Project: GENETIC AND GENOMIC APPROACHES TO IMPROVE PEANUT AND CORN RESISTANCE TO DISEASE AND AFLATOXIN CONTAMINATION Title: Registration of maize inbred line GT603

Authors
item Guo, Baozhu
item Krakowsky, Matthew
item Ni, Xinzhi
item Scully, Brian
item Lee, R.D. -
item Coy, A.E. -
item Widstrom, Neil

Submitted to: Journal of Plant Registrations
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: August 17, 2010
Publication Date: May 1, 2011
Citation: Guo, B.Z., Krakowsky, M.D., Ni, X., Scully, B.T., Lee, R.D., Coy, A.E., Widstrom, N.W. 2011. Registration of maize inbred line GT603. Journal of Plant Registrations. 5(2):211-214.

Interpretive Summary: Infection of corn with Aspergillus flavus and consequent contamination with aflatoxin, a by-product of fungal metabolism and the most potent naturally-occurring carcinogen, are a serious threat to agricultural production and to human and animal safety. Intense efforts are underway to reduce/eliminate aflatoxin contamination in feed and food supplies. Thus, there is an increasing need to seek new resistant germplasm for the prevention of preharvest aflatoxin contamination. GT603 is a yellow dent corn inbred line developed and released by the USDA-ARS Crop Protection and Management Research Unit in cooperation with the University of Georgia Coastal Plain Experiment Station in 2010. GT603 was developed through seven generations of self-pollination from a corn population GT-MAS:gk which was released as a source of resistance to Aspergillus flavus. GT603 was initially selected from early self-pollinated lines under the experimental name GT-P50. Laboratory and field studies demonstrated that GT603 had aflatoxin levels similar to or lower than the related inbred lines GT601 and GT602 and the controls Mp313E and Mp715, but the maturity was earlier than Mp313E and Mp715. In hybrid performance tests in 2005 and 2009, GT603 exhibited better combining ability and heterosis with the Stiff Stalk Synthetic (SSS) inbred (B73) than the non-Stiff Stalk Synthetic inbred (Mo17) for aflatoxin levels, yields and biomass. GT603 is being registered and released to the public as a source of resistance, and could be used in other breeding programs to develop Aspergillus/aflatoxin-resistant corn for corn growers

Technical Abstract: GT603 (Reg. No. xxxx, PI xxxxxx) is a yellow dent maize (Zea mays L.) inbred line developed and released by the USDA-ARS Crop Protection and Management Research Unit in cooperation with the University of Georgia Coastal Plain Experiment Station in 2010. GT603 was developed through seven generations of self-pollination from a maize population GT-MAS:gk (PI 561859) which was released as a source of resistance to Aspergillus flavus. GT603 was initially selected from early self-pollinated lines under the experimental name GT-P50. Laboratory and field studies demonstrated that GT603 had aflatoxin levels similar to or lower than the related inbred lines GT601 (PI 644026) and GT602 (PI 644027) and the controls Mp313E (PI539859) and Mp715 (PI614819), but the maturity was earlier than Mp313E and Mp715. In hybrid performance tests in 2005 and 2009, GT603 exhibited better combining ability and heterosis with the Stiff Stalk Synthetic (SSS) inbred (B73) than the non-Stiff Stalk Synthetic inbred (Mo17) for aflatoxin levels, yields and biomass.

Last Modified: 12/19/2014
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