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CROP BREEDING, GENETICS & CYTOLOGY

BSSS53 as a Donor Source for Increased Whole-Kernel Methionine in Maize

Selection and Evaluation of High-Methionine Inbreds and Hybrids

^a Monsanto, 1203A Airport Road, Ames, IA 50010
^b Pioneer Hi-bred International, Johnston, IA 50131
^c Univ. of Minnesota, Dep. of Agronomy and Plant Genetics and Plant Molecular Genetics Institute, 411 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108

^* Corresponding author (phill005{at}tc.umn.edu).

Increasing the whole-kernel methionine [MET; 2-amino-4-(methylthio)-butyric acid] level of maize (Zea mays L.) would improve the quality of the grain for poultry feed. Our objective was to increase the MET levels of A632, B73, Mo17, A632/Mo17, B73/A632, and B73/Mo17, with the high-MET inbred BSSS53 as a donor parent. Backcross-derived lines were evaluated per se in trials during 3 yr, and hybrids among subsets of these lines were evaluated in three replicates during 1998. Methionine levels of the best A632 recoveries were increased by 17% after three backcrosses and 11% after four backcrosses. Methionine levels of the best B73 recoveries were increased by 20% after three backcrosses and 17% after four backcrosses. In the Mo17 genetic background, MET levels of the best recoveries were increased by 55% after three backcrosses and 31% after four backcrosses. Crosses among the highest MET backcross-derived lines produced hybrids with significant 23 to 43% increases in whole-kernel MET compared with corresponding control hybrids. Significant increases in the MET levels of experimental hybrids indicate that BSSS53 is a useful donor source of whole-kernel MET and that selection within normal dent maize germplasm can be effectively utilized to produce high-MET hybrids.

Abbreviations: AK, aspartate kinase • CP, crude protein • DM, dry matter • kDa, kilodalton • MET, methionine • NIRS, near infrared reflectance spectrophotometry • QPM, quality protein maize

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Crop Science 2003 43: 1581. [Full Text]  

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