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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 | | |
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| 0 | PI 608775 | BS19(S)C2 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1992 | DEVELOPED | | | | | | Breeding material | BS19(S)C2 is a yellow dent improved population of a maize synthetic originally designated as Iowa Early Rootworm Synthetic. A large number of inbred lines were evaluated as inbreds per se and in hybrid combinations for corn rootworm tolerance and several root traits. Twelve inbred lines were selected as parent lines for an early synthetic to be used in further studies of resistance, particularly tolerance, to corn rootworms [Diabrotica virgifera Le Conte, D. longicornis (Say), and D. undecimpunctata Barber]. These lines were: W153, A239, A251, A265, A297 A417, A556, A632, Ms107, Oh43, R168, and SD10. Collectively, these inbred lines possessed root characteristics believed required in a population for good tolerance to corn rootworm larval damage. Recurrent selection based on the evaluation of S1 lines in replicated experiments was used for two cycles, resulting in the C2 population. Traits evaluated were resistance to root lodging in the second cycle, and root damage by larval feeding, root system size, and secondary root development in both cycles. In the first cycle, 234 S1 lines were evaluated, and 24 selected for recombination to give the Cl. We evaluated 122 S1 lines in the second cycle and selected 20 S1 lines for recombination to give BS19(S)C2. Predicted gains in each cycle indicate that this population will be a good source for early inbred lines that have adequate tolerance to corn rootworms. Also, several of the original parent lines were widely used as parent lines in hybrid seed programs; consequently, inbred lines developed from this source are expected to have above average general combining ability. The maturity classification is approximately AES5OO. | 1082050 | PI 608775 |
| 1 | PI 608776 | BS20(S)C2 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 1992 | DEVELOPED | | | | | | Breeding material | BS20(S)C2 is a yellow dent synthetic that was derived from BS20 (originally designated as Iowa Late Rootworm Synthetic). A large number of inbred lines were evaluated as inbreds per se and in hybrid combinations for corn rootworm tolerance and several root traits. Twelve inbred lines were selected as parent lines for a late synthetic, BS20, to be used in further studies of resistance or tolerance to corn rootworms. These lines were: B14A, B53, B57, B64, B67, B69, A73, N6, N28, R101, HD2286 (BSSS sel.), and 38-11. As a group, these inbred lines would contribute root characteristics believed required in a maize population for good tolerance to corn rootworm larval damage. Six of these lines originated from BSSS (Iowa Stiff Stalk Synthetic), and B64 derived from a backcross program in which B14 was the recurrent parent; consequently, BS20CO obtained more than 55% of its genes from BSSS. An evaluation of BS20CO in a synthetic diallel showed that it was superior in general combining ability for yield and resistance to root and stalk lodging (Euphytica 25:117-127). Recurrent selection based on the evaluation of S1 lines in replicated experiments was used for two cycles, resulting in the C2 population. The first cycle evaluation was of 234 S1 lines, and 24 were selected for recombination to give the Cl. In the second cycle, 123 S1 lines were evaluated and 20 were selected and recombined to give the C2. Traits evaluated in both cycles were resistance to root lodging, root damage by larval feeding, root system size, and secondary root development. The C2 population has a vigorous plant with an extensive root system; thus, it is expected to be an excellent source from which breeders may develop inbred lines. The maturity classification is approximately AES800. | 1082053 | PI 608776 |