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| ACCESSION | PLANT NAME | TAXONOMY | ORIGIN | GENEBANK | IMAGE | AVAILABILITY | RECEIVED | SOURCE TYPE | SOURCE DATE | COLLECTION SITE | COORDINATES | ELEVATION | HABITAT | IMPROVEMENT LEVEL | NARRATIVE | | |
|---|
| 0 | PI 614142 | 'GEMS-0001' | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1999 | DEVELOPED | 06/21/1999 | | | | | Cultivar | Recurrent parent, B94, is an AES 800 maturity stiff-stalk synthetic inbred line, selected for high yield performance in single cross tests. Flowered 5 days later than B94 at Ames, IA in 1998, and 3 days later than B94 at Stoneville, MS in 1999. Donor parent, PI 503806, a tropical maize from Peru selected for resistance to leaf blade feeding damage caused by first generation European corn borer and leaf sheath and collar feeding damage caused by the second generation. Resistance for PI 503806 is not based on DIMBOA levels, a cyclic hydroxamic acid commonly associated with conventional leaf blade feeding resistance in maize. Breeding lines from the cross PI 503806 x B94 were advanced by backcrossing to B94 three generations. Throughout the breeding program, donor plants were selected by evaluating their resistance to European corn borer feeding on leaf blades, leaf sheaths, and collars of plants artificially infested with the insect. Only selected resistant plants were carried forward in the breeding effort. Third generation backcross seed were grown in Ames, IA in 1999 and plants were full sib-mated to obtain a seed increase for distribution. In addition to European corn borer resistance, also selected for superior yield compared to other experimental lines in the resistance breeding program. 160 second generation backcross parents from the breeding program were tested for yield. Three plants from each parent, including the parent of GEMS-0001, were selfed and crossed to a private non-stiff stalk tester, LH 185, and the hybrid seed was grown in a five location yield trial using U.S. Corn Belt locations. One parent hybrid of GEMS-0001 yielded well at 9756.1 kg/ha (155.6 bu/A) which was 95.3% of the highest yielding commercial check and 105.3% of the commercial check average. The other two parent hybrids of GEMS-0001 yielded 8941.0 kg/ha and 8727.8 kg/ha (142.6 and 139.2 bu/A). | 1574895 | PI 614142 |