Galaxy can support any genome version. It's just a question if the administrator has installed the genome of interest. Also installing a genome can mean different things. A Galaxy instance, for example, can offer the sequence as a FASTA sequence but might be missing the bowtie2 index. What I want to say is, if you are missing a genome or an index or any support, please get in contact with your Galaxy admin and ask him to install it. Also, please note that you do not need you do not need the installed genome at all. Most of the Galaxy tools support taking a FASTA file from you. So if you have your potato genome, just upload it into your history and you should be good to go. There is also a feature called custom genomes that might help you.