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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 636502 | BSLE(M-L)C30 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | | 2004 | DEVELOPED | | | | | | Breeding material | A strain of Iowa Long Ear Synthetic (BSLECO) developed by 30 cycles of mass selection for increased ear length. Average ear length increased 0.27 cm/cycle of mass seletion. Ear length of BSLE(M-L)C27 was 27.3 cm compared with 20.0 cm for BSLECO. Selection for increased ear length did not increase grain yield; there was a nonsignificant yield decrease of 0.27 t/ha after 27 cycles of mass selection for increased ear length. Correlated changes with mass selection for increased ear length included increases in plant (41 cm) and ear (27 cm) height and days to flower (5.7 d), whereas ear diameter (0.54 cm) and number of kernel rows (1.6) decreased compared with BSLECO. Root and stalk lodging and prolificacy also increased with mass selection for increased ear length. | 1669131 | PI 636502 |
| 1 | PI 636503 | BSLE(M-S)C30 | Zea mays L. subsp. mays | Iowa, United States | NC7 |  | Not Available | 2004 | DEVELOPED | | | | | | Breeding material | A strain of Iowa Long Ear Synthetic (BSLECO) developed after 30 cycles of mass selection for reduced ear length. Average ear length decreased 0.37 cm/cycle of mass selection. After 27 cycles of mass selection, ear length was 10 cm less than average ear length of BSLECO. Correlated changes with selection for reduced ear length included 2.20 t/ha less grain yield, reductions of 43 cm for plant height, 22 cm for ear height, and 5.7 d for days to flower, increases 0.27 cm for ear diameter and 3.0 for number of kernel rows, and reductions in root and stalk lodging compared with BSLECO. | 1669132 | PI 636503 |