Document Type

Event

Start Date

28-3-2014 9:00 AM

End Date

28-3-2014 9:55 AM

Faculty Sponsor

Dr. Punya Nachappa

Department/Program

Department of Biology

University Affiliation

Indiana University-Purdue University Fort Wayne

IPFW Sigma Xi (Scientific Research Honor Society) Student Research Competition

Best Graduate Student Poster Presentation

Award Winner

First

Abstract

Soybean (Glycine max) is an important crop due to its versatility as a food source as well as various applications in industries such as biofuel and textiles. Among various environmental stresses that impact soybean productivity, drought stress is a major concern causing reductions in yield of up to 40%. In addition to a direct impact on yield, drought stress promotes outbreaks of insect pests and pathogens. The soybean aphid (Aphis glycines Matsumura) is a major pest that not only reduces yields by direct feeding, but also due to the transmission of various economically important viruses such as Soybean mosaic virus (SMV). There are no published reports on the impact of drought stress on soybean aphid population growth rate and disease development. The objectives of our study were to: (1) determine the effects of drought stress on aphid populations and SMV disease development and (2) determine plant molecular mechanisms underlying the interaction. Soybean plants were subjected to varying levels of drought stress (25, 50, 75, and 100% volumetric water content) and subsequently exposed to uninfected aphids and SMV infection by viruliferous aphid feeding. Drought stress and water saturated conditions negatively impacted aphid populations. Gene expression analysis revealed significant interaction between phytohormones involved in biotic stress (Salicylic acid and Jasmonic acid) and abiotic stress (Abscisic acid) responses. Our results suggest that during drought stress a complex interplay between metabolic pathways and defense responses influence the outcomes between soybean aphid, SMV, and the host plant.

Keywords

soybean aphid

 
Mar 28th, 9:00 AM Mar 28th, 9:55 AM

Effect of Drought Stress on Soybean Aphid (Aphis glycines Matsumura) Populations and Soybean Mosaic Virus Infection

Soybean (Glycine max) is an important crop due to its versatility as a food source as well as various applications in industries such as biofuel and textiles. Among various environmental stresses that impact soybean productivity, drought stress is a major concern causing reductions in yield of up to 40%. In addition to a direct impact on yield, drought stress promotes outbreaks of insect pests and pathogens. The soybean aphid (Aphis glycines Matsumura) is a major pest that not only reduces yields by direct feeding, but also due to the transmission of various economically important viruses such as Soybean mosaic virus (SMV). There are no published reports on the impact of drought stress on soybean aphid population growth rate and disease development. The objectives of our study were to: (1) determine the effects of drought stress on aphid populations and SMV disease development and (2) determine plant molecular mechanisms underlying the interaction. Soybean plants were subjected to varying levels of drought stress (25, 50, 75, and 100% volumetric water content) and subsequently exposed to uninfected aphids and SMV infection by viruliferous aphid feeding. Drought stress and water saturated conditions negatively impacted aphid populations. Gene expression analysis revealed significant interaction between phytohormones involved in biotic stress (Salicylic acid and Jasmonic acid) and abiotic stress (Abscisic acid) responses. Our results suggest that during drought stress a complex interplay between metabolic pathways and defense responses influence the outcomes between soybean aphid, SMV, and the host plant.