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The antimicrobial protein gene  LJAMP2  is a plant non-specific lipid transfer protein from motherwort ( Leonurus japonicus ). In this study, it was introduced into Chinese white poplar ( Populus tomentosa  Carr.) via  Agrobacterium -mediated transformation with neomycin phosphotransferase II gene conferring kanamycin resistance as selectable marker. A total of 16 poplar lines were obtained, and polymerase chain reaction (PCR) analysis established the stable integration of transgenes in the plant genome. Reverse transcription–PCR detected  LJAMP2  expression in transgenic plants. Resistance to fungal pathogens  Alternaria alternata  (Fr.) Keissler and  Colletotrichum gloeosporioides  (Penz.) of transgenic poplar lines was tested. In vitro inhibitory activity against the fungal pathogens was evident from the crude leaf extracts from the transformants. In vivo assays showed that, after infection with both  A. alternata  (Fr.) Keissler and  C. gloeosporioides  (Penz.), there was a significant reduction in disease symptoms in transgenic poplar plants compared with the control. These results suggest that constitutive expression of the  LJAMP2  gene from motherwort can be exploited to improve resistance to fungal pathogens in poplar.

tree physiology

Enhanced resistance to fungal pathogens in transgenic  Populus tomentosa  Carr. by overexpression of an nsLTP-like antimicrobial protein gene from motherwort ( Leonurus japonicus )