hybrids could be seen as intermediates. For example, could act as an B. juncea intermediate species for If genes from were to be introgressed into B. napus. B. napus the genome of could act as bridge to transfer these genes into B. juncea, B. juncea and from the latter into (Andersson & Vicente 2010). Crossing B. nigra, S. arvensis between and is possible because they share a common genome (the B. juncea B. nigra B genome, see Figure 1). However, hybridization between these species has not been observed under natural conditions. Hybrids have only been produced under artificial conditions and backcrossing to does not produce viable plants (Salisbury B. nigra 2006). Thus, this introgression pathway is considered highly unlikely. has also been proposed as an intermediate species. Indeed, and B. rapa B. napus have been shown to hybridize in the field under natural conditions (see B. rapa Section 9.3 for more details). However, such hybrids are less competitive and persistent than their parents, due to lower fertility and reduced dormancy (Bing et al. 1991; Jorgensen et al. 1999). does not hybridize with B. rapa B. tournefortii, or (Warwick et al. 2009). Based on the H. incana, R. raphanistrum S. arvensis available data, the potential for gene transfer to weed relatives using as a B. rapa bridge is considered unlikely.
hybrids could be seen as intermediates. For example, B. juncea could act as an intermediate species for B. napus. If genes from B. napus were to be introgressed into the genome of B. juncea, B. juncea could act as bridge to transfer these genes into B. nigra, and from the latter into S. arvensis (Andersson & Vicente 2010). Crossing between B. juncea and B. nigra is possible because they share a common genome (the B genome, see Figure 1). However, hybridization between these species has not been observed under natural conditions. Hybrids have only been produced under artificial conditions and backcrossing to B. nigra does not produce viable plants (Salisbury 2006). Thus, this introgression pathway is considered highly unlikely. B. rapa has also been proposed as an intermediate species. Indeed, B. napus and B. rapa have been shown to hybridize in the field under natural conditions (see Section 9.3 for more details). However, such hybrids are less competitive and persistent than their parents, due to lower fertility and reduced dormancy (Bing et al. 1991; Jorgensen et al. 1999). B. rapa does not hybridize with B. tournefortii, H. incana, R. raphanistrum or S. arvensis (Warwick et al. 2009). Based on the available data, the potential for gene transfer to weed relatives using B. rapa as a bridge is considered unlikely.
Biology%20of%20Canola%20and%20Indian%20mustard%20February%202017.docx