Recovery of N2 Fixation in Soybean Following Insect-Induced Defoliation

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Recovery of N2-fixing ability (measured by C2H2-C2H4 assay) of greenhouse grown soybean following defoliation by soybean looper, Pseudoplusia includens (Walker) (Lepidoptera: Noctuidae), was examined in two experiments. Experiment I examined nodulation, N2 fixation, and dry weight of plant parts of 'Forrest' soybean at 0, 2, and 4 wk post defoliation (WPD) (70% defoliation). Experiment 2 examined these same variables in 'Davis' soybean at 0, I, 2, 3, 4, and 5 WPD (73%defoliation). In both experiments, leaf area, stem dry weight, and root dry weight of defoliated plants were greatly reduced at 0 WPD; they never recovered to the level of control plants. Although N2-fixing ability of defoliated plants was reduced 4.9-fold in Experiment I and 8.7-fold in Experiment 2 at 0 WPD, there was no significant difference in N2-fixing ability of defoliated and control plants in either experiment at 4 WPD. Recovery of N2-fixing ability was due to partial recovery of total nodule dry weight, combined with complete recovery of nodule specific activity.

Document Type: Research Article

Publication date: August 1, 1988

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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