期刊
MICROBIAL ECOLOGY
卷 86, 期 3, 页码 2173-2182出版社
SPRINGER
DOI: 10.1007/s00248-023-02232-8
关键词
Helicoverpa zea; Microbial community; Induced defense; Polyphenol oxidase; Insect-plant interactions
Insect-associated bacteria play a crucial role in modulating the interactions between insects and plants. This study demonstrates the significance of gut-associated bacteria in inducing herbivore-induced defenses in tomato. The findings suggest that certain bacterial isolates or communities can trigger plant defense responses and affect the development of herbivorous insects.
Insect-associated bacteria can mediate the intersection of insect and plant immunity. In this study, we aimed to evaluate the effects of single isolates or communities of gut-associated bacteria of Helicoverpa zea larvae on herbivore-induced defenses in tomato. We first identified bacterial isolates from the regurgitant of field-collected H. zea larvae by using a culture-dependent method and 16S rRNA gene sequencing. We identified 11 isolates belonging to the families Enterobacteriaceae, Streptococcaceae, Yersiniaceae, Erwiniaceae, and unclassified Enterobacterales. Seven different bacterial isolates, namely Enterobacteriaceae-1, Lactococcus sp., Klebsiella sp. 1, Klebsiella sp. 3, Enterobacterales, Enterobacteriaceae-2, and Pantoea sp., were selected based on their phylogenetic relationships to test their impacts on insect-induced plant defenses. We found that the laboratory population of H. zea larvae inoculated with individual isolates did not induce plant anti-herbivore defenses, whereas larvae inoculated with a bacterial community (combination of the 7 bacterial isolates) triggered increased polyphenol oxidase (PPO) activity in tomato, leading to retarded larval development. Additionally, field-collected H. zea larvae with an unaltered bacterial community in their gut stimulated higher plant defenses than the larvae with a reduced gut microbial community. In summary, our findings highlight the importance of the gut microbial community in mediating interactions between herbivores and their host plants.
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