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Dietary effects of cotton tissue expressing germin like protein on beet armyworm (Lepidoptera: Noctuidae) growth, survival and pupation

J. Scott Armstrong, Haggag Abdel-Mageed, Mohamed Fokar, Randy Allen, John J. Adamczyk
Florida entomologist 2013 v.96 no.3 pp. 693-700
Gossypium hirsutum, Spodoptera exigua, animal feeding, bioassays, cotton, egg hatchability, genetic lines, hatching, insect eggs, insect growth, larvae, nutritive value, pest resistance, plant tissues, protein synthesis, proteins, pupation, resistance mechanisms, statistical analysis, survival rate, transgenic plants
Transgenic cotton lines that ectopically express a cotton germin-like protein (GLP) were screened for resistance/tolerance factors to the beet armyworm (BAW) Spodoptera exigua (Hübner) via feeding assays. The number of BAW eggs that successfully hatched was not statistically different at 72 h after infestation for wild-type cotton plants (Gossypium hirsutum L. c.v. 'Coker 312') or plants of 4 independent transgenic lines (ABP-A, ABPB and ABP-C and ABP-D). However, the damage caused by these same larvae at 72 h was higher for Coker 312 and line ABP-D when compared to ABP-A, ABP-B and ABP-C transgenic plants. Larval live weights were also significantly higher for Coker 312 and ABP-D at 5, 7, and 14 d when compared to ABP-A, ABP-B, and ABP-C. The percentage of larvae that successfully completed pupation was significantly higher for BAW larvae fed 'Coker 312' and ABP-D tissue compared to the other 3 lines. These feeding bioassays show the potential for using cotton germin like protein to improve resistance or tolerance for BAW attacking cotton.