Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 15, 1999
Publication Date: N/A
Interpretive Summary: Aflatoxin, which is produced by the fungus Aspergillus flavus, is carcinogenic to humans and toxic to livestock and other animals. Alfatoxin contamination is a serious problem in corn and several other crops. Aflatoxin production is frequently associated with high temperatures and drought. Growing corn hybrids with genetic resistance to aflatoxin accumulation is widely considered a desirable method for eliminating the problem. USDA-ARS and the Mississippi Agricultural and Forestry Experiment Station recently released a germplasm line, Mp715, that can be used by plant breeders as a source of resistance to aflatoxin in developing corn hybrids with resistance to aflatoxin.
Technical Abstract: Maize (Zea mays L.) germplasm line Mp715 was released as a source of resistance to aflatoxin accumulation by USDA-ARS and the Mississippi Agricultural and Forestry Experiment Station in March 1999. Mp715 was developed from Tuxpan by selfing for either generations and selecting for reduced aflatoxin accumulation following inoculations of developing ears with an Aspergillus flavus Link ex Fr. spore suspension. In crosses with other germplasm lines, Mp715 exhibited a high level of resistance to aflatoxin accumulation in both 1996 and 1997. In 1996, grain harvested from Mp715 x Mp313E contained 18 ng g-1 aflatoxin whereas grain from GA209 x Sc212M, the susceptible check, contained 1532 ng g-1 alfatoxin. Mp715 is a late-maturing line with a maturity classification of AES 1200. It has yellow kernels and white cobs. It has not been evaluated for combining ability for yield.