Plant growth-promoting rhizobacteria modulate induced corn defense against Spodoptera litura (Lepidoptera: Noctuidae)

Author:

Cortez Amado O12ORCID,Yoshinaga Naoko3ORCID,Mori Naoki3,Hwang Shaw-Yhi1ORCID

Affiliation:

1. Insect-Plant Interaction Laboratory, Department of Entomology, College of Agriculture and Natural Resources, National Chung Hsing University , Taichung , Taiwan

2. Department of Crop Science, College of Agriculture, Isabela State University , Echague, Isabela , the Philippines

3. Chemical Ecology Laboratory, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University , Kyoto , Japan

Abstract

Abstract Common cutworm, Spodoptera litura is an important pest of corn causing significant crop yield loss. Synthetic insecticides have mostly been used to combat this pest, raising human and environmental health concerns. Plant growth-promoting rhizobacteria (PGPR) could compensate for or augment the harmful effects of agrochemicals. Herein, we aimed to assess whether PGPR-induced defenses in corn plants impact the host-plant selection behavior of S. litura. Headspace volatile organic compounds were analyzed using gas chromatography–mass spectrometry. Larvae fed inoculated corn exhibited lower weights and relative growth rate than noninoculated plants. Under choice experiments, PGPR-treated plants significantly reduced percentage leaf damage area and oviposition rate compared to untreated plants. Volatile organic compound ratio emission varied significantly between control and PGPR treatments, which, in part, explains feeding and oviposition deterrence in PGPR-treated plants. The results demonstrate that PGPR inoculation can enhance corn resistance to S. litura, making it a promising candidate for crop protection strategies.

Publisher

Oxford University Press (OUP)

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