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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 633541 | A92-200 | Glycine max (L.) Merr. | Iowa, United States | SOY |  | | 2003 | DEVELOPED | | | | | | Genetic material | Genetic Type T368 is an apetalous, male-sterile line of soybean found by the Soybean Research Foundation as a single plant in the F12 generation in a cross of 'SRF 200' X ('SRF 300' X 'Tracy'). Genetic studies indicated that a single recessive nuclear gene is responsible for this apetalous, highly male-sterile trait in soybean (Skorupska et al., 1993). The morphological features are lack of standard petal, lateral wings, keel petals, and the appearance of an elongated sepaloid calyx. Gynoecia were characterized by enlarged unfused ovaries and exposed ovules. The mutant line is maintained as the heterozygote (T368H). The mutant line has purple flowers, gray pubescence, erect and normal pubescence, brown pod, yellow seed coat, buff hila, and is maturity group I. Different types of malformations were observed in androecium development in mutant plants. Mutant flowers had only two to four stamens, which were unable to form a normal staminal column. A full complement of stamens was observed in only about 1 % of the mutant flowers. Male sterility was attributed to tapetal malfunction. The plants, however, produced a few selfed pods (Skorupska et al., 1993). Also, a few plants may produce outcrossed pods. In segregating progenies, the apetalous trait and the male-sterile trait were inherited together. This may be a pleiotropic effect, instead of tight linkage of the two traits. The plant hormones indole-3-acetic acid (IAA) and abscisic acid (ABA) were quantified and compared in the normal (wild-type) and apetally mutant (Skorupska et al., 1994). The mutant had lower endogenous amounts of IAA and ABA than the wild-type, and the differences were more pronounced in plants grown in the glasshouse than in plants grown in the field. The soybean apetalous mutant might have utility as a female parent in hybrid seed production for plant breeding studies. The manual cross-pollination success rate with apetalous plants as female parent are comparable to cross-pollinations made | 1646226 | PI 633541 |