Tobacco anionic peroxidase often increases resistance to insects in different dicotyledonous species

✍ Scribed by Dowd, Patrick F; Mark Lagrimini, L; Herms, Daniel A

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 58 KB
• Volume: 55
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199906)55:6<633::aid-ps981>3.0.co;2-5

✦ Synopsis

Different species and strains of tobacco (Nicotiana spp), tomato (Lycopersicon esculentum) and sweetgum (Liquidambar styraci¯ua) that had total peroxidase activity enhanced by a few-to over 100-fold through the expression of a tobacco anionic peroxidase gene driven by a cauli¯ower mosaic promoter were compared with wild-type plants for resistance to relevant insects. Reduced levels of feeding were generally noticed for leaves, stems and fruit, but the age of tissues and insects in¯uenced the response. Enhanced resistance to Helicoverpa zea and Manduca sexta were noted for tobacco and tomato, and resistance to Hyphantria cunea and Lymantria dispar were noted for sweetgum. In several cases increased mortality and/or reduced growth rates were noted for the highperoxidase plants. Although many modes of action are possible, indirect comparisons and gravitational nutritional studies suggest peroxidase-enhanced rates of production of compounds toxic to the insects are the most important.