What is the fine-grained topic of the following text: In addition to the Scottish-focussed research described in the four main Research Programmes, there is also additional funding for taxonomic and systematics research, plant conservation and collections which focus on overseas plant biodiversity, carried out by the Royal Botanic Garden, Edinbrugh (RBGE). Only return the topic.
Overseas plant biodiversity research and conservation by the Royal Botanic Garden, Edinburgh.