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This paper outlines the construction of a novel vector system comprising interchangeable terminators, as well as a multiple cloning site (MCS), to facilitate the transformation of the fungal plant pathogen Botrytis cinerea. Previous molecular studies on B. cinerea have relied upon the pLOB1 based vector system (controlled by the Aspergillus nidulans oliC promoter and a region reported to be the B. cinerea tubA terminator). Investigations, however, have revealed that, rather than the genuine B. cinerea tubA terminator, the pLOB1 terminator fragment is from another gene locus within the genome. Because previous studies have found that terminators aide in transcript stability, the main aims of this study were to develop and evaluate both vector systems, pOT (controlled by the A. nidulans oliC promoter and A. nidulans trpC terminator) and pLOB, with a range of exogenous genes, including enhanced green fluorescent protein (eGFP), monomeric red fluorescent protein (mRFP), luciferase (LUC) and beta-glucuronidase (GUS). Our investigations demonstrate that pLOB and pOT based vectors are capable of expressing all four reporter genes and may be applied to future molecular studies on B. cinerea and other related ascomycetes. Additionally, this is the first reported expression of mRFP and LUC in B. cinerea.

The pOT and pLOB vector systems: Improving ease of transgene expression in Botrytis cinerea