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GERMPLASM

Registration of Six Tropical Maize Germplasm Lines with Resistance to Aflatoxin Contamination

^a International Institute of Tropical Agriculture, Oyo Rd., PMB 5320, Ibadan, Nigeria
^b USDA-ARS, Southern Regional Research Center, New Orleans, LA 70179

^* Corresponding author (a.menkir{at}cgiar.org).

ABSTRACT

Six tropical maize (Zea mays L.) germplasm lines, TZAR101 (Reg. No. GP-568, PI 654048), TZAR102 (Reg. No. GP-569, PI 654049), TZAR103 (Reg. No. GP-570, PI 654050), TZAR104 (Reg. No. GP-571, PI 654051), TZAR105 (Reg. No. GP-572, PI 654052), and TZAR106 (Reg. No. GP-573, PI 654053), with resistance to aflatoxin contamination were developed by the International Institute of Tropical Agriculture through a collaborative breeding project with Southern Regional Research Center of the USDA-ARS. The lines were derived from biparental crosses and backcross populations involving aflatoxin-resistant tropical elite and temperate inbred lines as parents. These lines had aflatoxin levels similar to or lower than a resistant U.S. inbred check, MI82, in both preliminary and confirmation tests conducted in the laboratory using a kernel-based screening assay. Further field tests of the six lines under artificial inoculation with an African strain of Aspergillus flavus in Nigeria revealed that these lines had lower levels of aflatoxin compared with elite tropical commercial inbred lines used as checks. These lines also had good agronomic traits and resistance to important diseases in the lowlands, including southern corn leaf blight [caused by Bipolaris maydis (Nisikado & Miyake) Shoemaker], southern corn rust (caused by Puccinia polysora Underw.), and ear rot.

Abbreviations: IITA, International Institute of Tropical Agriculture • KSA, kernel-screening assay • SRRC, Southern Regional Research Center • TLC, thin-layer chromatography