Abstract
With transgenic crop development it is important to evaluate the potential for transgenes to escape into populations of wild, weedy relatives. Ethiopian mustard (Brassica carinata, BBCC) is easily transformed and is being investigated for uses from biodiesel fuels to biopharmaceuticals. However, little work has been done evaluating its ability to cross with relatives such as wild mustard (Sinapsis arvensis, SrSr), an abundant, cosmopolitan weedy relative. Here we conducted bidirectional crosses with Ethiopian mustard as a maternal parent in 997 crosses and paternal parent in 1,109 crosses. Hybrids were confirmed using flow cytometry and species-specific ITS molecular markers and indicate a high hybridization rate of 6.43 % between Ethiopian mustard (♀) and wild mustard (♂) and a lower, but not insignificant, hybridization rate of 0.01 % in the reverse direction. The majority of the hybrids were homoploid (BCSr) with less than 1 % of pollen production of their parents and low seed production (0.26 seeds/pollination) in crosses and backcrosses indicating a potential for advanced generation hybrids. The accession used had a significant effect on hybrid seed production with different accessions of Ethopian mustard varying in their production of hybrid offspring from 2.69 to 16.34 % and one accession of wild mustard siring almost twice as many hybrid offspring per flower as the other. One pentaploid (BBCCSr) and one hexaploid (BBCCSrSr) hybrid were produced and had higher pollen viability, though no and low seed production, respectively. As wild mustard is self-incompatible and the outcrossing rate of Ethiopian mustard has been estimated as 30 % potential for hybrid production in the wild appears to be high, though the hybridization rate found here represents a worst case scenario as it does not incorporate pre-pollination barriers. Hybridization in the wild needs to be directly evaluated as does the propensity of Ethiopian mustard to volunteer.
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Acknowledgments
We thank Ellen Wagner, Christopher Martin and Drs. Suzanne Warwick, Linda Hall, Laurian Robert and Tyler Smith for comments on the manuscript and Paul Kron for help with flow cytometry.
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Supplementary material 1 (PDF 943 kb) Supporting Information Fig. 1. From left to right inflorescences and stems of wild mustard (Sinapis arvensis), hybrids, and Ethiopian mustard (Brassica carinata)
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Supplementary material 2 (PDF 629 kb) Supporting Information Fig. 2. From left to right developing seed pods for wild mustard (Sinapis arvensis), two hybrid plants (EW-A), and Ethiopian mustard (Brassica carinata)
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Cheung, K.W., Razeq, F.M., Sauder, C.A. et al. Bidirectional but asymmetrical sexual hybridization between Brassica carinata and Sinapis arvensis (Brassicaceae). J Plant Res 128, 469–480 (2015). https://doi.org/10.1007/s10265-015-0702-2
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DOI: https://doi.org/10.1007/s10265-015-0702-2