Abstract
The genus Asparagus (Asparagaceae) encompasses 100–300 species, including the important vegetable crop, A. officinalis (garden asparagus). Previous attempts to hybridize garden asparagus with A. densiflorus (Kunth) Jessop, with the aim of introducing disease resistance, were unsuccessful because of the failure of endosperm development. In the present study, reciprocal interspecific hybrids between garden asparagus and A. schoberioides Kunth were generated by hand pollination. The F1 hybrids were analyzed by using both morphological and molecular techniques. This is the first report describing the production of an interspecific hybrid between garden asparagus at the diploid level (2n = 2x = 20) and its diploid (2n = 2x = 20) wild relative, A. schoberioides. Morphological characteristics of candidate hybrids were a mixture of those found in the parents, and cytological and RFLP analyses confirmed that morphologically intermediate plants were indeed diploid hybrids of those two species. In other words, post-zygotic isolation is not complete between phylogenetically distinct these two species. Our results suggest that other Asparagus species may be capable of hybridizing with A. officinalis and that introducing wild characters through interspecific hybridization may offer advantages for breeding for novel traits.
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Acknowledgments
We wish to thank, Y. Hayashi, J.-H. Park, H. Saeki, P.-Y. Yun, B.-J. Park, H. Hienuki, R. Miura, T. Nakamura, I.-J. Song, Y. Mashiko, M. Nakada, R. Shinohara, M. Komatsu, N. Kuroiwa, T. Shishido, S.-Y. Kim, M. Hirai, T. Kamimura, H. Nakayama and H. Tokairin for providing much help and advice. This study was partly supported by a Grant from Itoh Science Foundation and Research Promotion for the Graduate School of Life Sciences, Tohoku University.
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Takuro Ito and Toshinori Ochiai authors are contributed equally to this work
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Ito, T., Ochiai, T., Ashizawa, H. et al. Production and analysis of reciprocal hybrids between Asparagus officinalis L. and A. schoberioides Kunth. Genet Resour Crop Evol 54, 1063–1071 (2007). https://doi.org/10.1007/s10722-006-9186-1
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DOI: https://doi.org/10.1007/s10722-006-9186-1