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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 640911 | AxN-1-55 | Glycine max (L.) Merr. | Illinois, United States | SOY | | | 2005 | DEVELOPED | 09/26/2005 | | | | | Breeding material | AxN-1-55 is an indeterminate line classified as having a midgroup II maturity. It was released because of its partial resistance to Sclerotinia stem rot [caused by Sclerotinia sclerotiorum (Lib.) de Bary] and good agronomic performance from 1997 to 2004 in cooperative Sclerotinia stem rot tests across the north central region of the USA. Across 11 environments of this test that had sufficient Sclerotinia stem rot to rate plant responses in the field, AxN-1-55 was significantly (P<0.05) less diseased than S19-90 or A2506. Sclerotinia stem rot infections were rated in these tests by individually scoring plants and calculating a disease severity index (DSI) for each plot. The DSI across environments was 17.7 for AxN-1-55, 29.3 for Syngenta S19-90, and 34.7 for A2506. S19-90 is recognized by soybean researchers as a partially resistant check that when challenged with S. sclerotiorum, typically shows a high level of resistance. AxN-1-55 was tested for yield and other agronomic traits across 19 environments of the cooperative tests. Seven of these environments are included in the 11 that were rated for Sclerotinia stem rot resistance, whereas little or no Sclerotinia stem rot was present at the other 12 locations. Across the 19 environments, AxN-1-55 yielded 2886 kg/ha compared to 2928 kg/ha for S19-90 and 3033 kg/ha for A2506. These differences were not significant at a=0.05. The maturity of AxN-1-55 was 2 days later than S19-90 and 4 days earlier than A2506. AxN-1-55 was 4 cm taller than S19-90 and 3 cm taller than A2506, and the lodging for AxN-1-55 was 0.1 unit (on a 1 to 5 scale) less than S19-90 and 0.2 less than A2506. Compared to 'Loda' across 15 of the 19 environments, AxN-1-55 yielded 147 kg/ha less, matured 6 days earlier, was 9 cm taller and had 0.3 units less lodging. AxN-1-55 has purple flowers, tawny pubescence, brown pod color at maturity, and yellow seeds. The line segregates for both black and gray hila. | 1684415 | PI 640911 |