The purpose of this study was to understand factors affecting in vitro embryo rescue culture from hybrids between diploid and tetraploid varieties of grape in creation new triploid germplasm resources. The effects of different media, removal ages of immature seeds and reciprocal crosses of parents on the germination and seedling survival of immature seeds from crosses between diploid and tetraploid grape varieties by in vitro embryo rescue culture were investigated. The results indicated that the medium consisting of NN-1969 + IAA 1.75 mg l−1 + GA3 0.35 mg l−1 + CH 400 mg l−1 + AC 2.0 g l−1 was better than other media. The optimal removal age of immature seeds for the best development of embryos was 35–45 days after pollination (DAP). The percentage of germination (PG) for immature seeds and the percentage of seedling survival (PSS) for immature seeds for diploid varieties used as female parents were 10.72% and 4.35% higher than when tetraploid varieties were used as female parents respectively. A total of 41 hybrid progenies from eight combinations were obtained, made up of 17 diploid, 9 tetraploid, 14 aneuploid, and 1 triploid progeny as determined by root-tip chromosome identification. The triploid progeny was from Fujiminori (2n = 4x = 76) × Jingxiu (2n = 2x = 38). These results implied that it was feasible to extend the hybridization range of grape and to create new germplasm resources by in vitro embryo rescue based on the conventional hybridization. The NN-1969 medium supplemented with GA3 and IAA was more propitious to the development of immature seeds sampled at about 45 DAP. It was easier to obtain plants using diploid as female parent, but triploid progeny was only obtained using tetraploid as female parent.
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The authors are very grateful to Hao Yan in Institute of Pomology of Gansu Academy of Agricultural Science for ungrudgingly affording part of materials. This work was supported by the Foundation of Gansu Provincial Sci. & Tech. Department(gso22-A41-046) and the Natural Science Foundation of Gansu province (ZSD11-A25-028-N).
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Yang, D., Li, W., Li, S. et al. In vitro embryo rescue culture of F1 progenies from crosses between diploid and tetraploid grape varieties. Plant Growth Regul 51, 63–71 (2007). https://doi.org/10.1007/s10725-006-9148-9
- Embryo rescue in vitro
- Chromosome identification
- Triploid plant