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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 642084 | Tricot | Helianthus annuus L. | North Dakota, United States | NC7 | | | 2006 | DEVELOPED | 2005 | | | | | Genetic material | Displays seedlings with three cotyledons, a phenotype controlled by a few recessive genes with about 50% penetrance. Seedlings bearing three cotyledons also bear three true leaves at each internode. Plant type potentially useful for faster establishment of seedlings after planting due to larger leaf area in the early growing stages, and may serve as a morphological characteristic for distinguishing cultivars. Frequency of seedlings bearing three cotyledons was approximately 2% (seven out of 334 seedlings) in BC3 F2 population. These seven mutant plants were transplanted into greenhouse with five plants survived to maturity. The observed tricotyledonous frequencies among the five F3 families in the field in 2003 ranged from 3 to 31% with an average of 18.5% (157 tricot in 755 seedlings counted). 12 plants randomly bagged to produce F4 progenies. Four F4 families selected for a higher frequency of tricotyledonous seedlings were planted in the field in 2004. Observed frequencies among the four F4 families ranged from 15 to 55%, with an average of 35.5% (122 tricot in 383 seedlings). Same test was repeated for four F5 families and the frequency ranged from 15% to 45%, with an average of 24.1% (72 tricot in 399 seedlings). Results suggested this anomalous characteristics is heritable. However, since the tricotyledony could not be fixed after self-pollination for three consecutive generations and no significant gain was observed from F4 to F5 generation, tricotyledony in this mutant seems to be derived from recessive genes of low penetrance. | 1695053 | PI 642084 |