Abstract
Calli were successfully induced from hypocotyls of eight wild diploid cotton species (Gossypium) on MSB (MS salts and B5 vitamins) medium supplemented with 0.09 μM 2,4-D (2,4-dichlorophenoxyacetic acid) and 2.32 μM KT (kinetin). Plant growth regulator (PGR) combinations, adding GA3 (Gibberellic acid), high inorganic salt stress, and PGR-free media were used to induce embryogenic calli from nonembryogenic calli. Embryogenic cultures were induced from G. aridum S. (D4 genome), G. davidsonii K. (D3-d genome), G. klotzschianum A. (D3-k genome), G. raimondii U. (D5 genome), and G. stocksii M. (E1 genome). We then observed somatic embryogenesis in the five species while calli of G. africanum V. (A1-2 genome), G. anomalum W. (B1 genome), and G. bickii P. (G genome) remained nonembryogenic. Somatic embryogenesis was adjusted by changing sugar sources, regulating combinations of PGRs, and using cell suspension culture. Embryos at various developmental stages produced mature and germinating embryos when cultured on filter paper placed on the media containing different sugar sources. The utility of different sugar sources promoted globular embryos developing into cotyledonary stage and increased the frequency of cotyledonary embryos developing into normal plants. Normal plantlets were regenerated from G. davidsonii, G. klotzschianum, G. raimondii, and G. stocksii. Only abnormal plantlets were obtained in G. aridum. This work will contribute to broadening the number of regenerable cotton species and provide foundations for somatic hybridization in cotton to create new germplasm.
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Acknowledgements
We thank Dr. K. B. Wang, Cotton Research Institute of CAAS, for providing the germplasm used in this study, and Professor J McD Stewart (University of Arkansas, USA) for his fruitful comments. This study was supported by funds provided by the National Basic Research Program of China (2004CB117301).
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Sun, Y., Zhang, X., Huang, C. et al. Somatic embryogenesis and plant regeneration from different wild diploid cotton (Gossypium) species. Plant Cell Rep 25, 289–296 (2006). https://doi.org/10.1007/s00299-005-0085-2
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DOI: https://doi.org/10.1007/s00299-005-0085-2