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Tropospheric ozone (O₃) is a secondary air pollutant and anthropogenic greenhouse gas. Concentrations of tropospheric O₃ ([O₃] have more than doubled since the Industrial Revolution, and are high enough to damage plant productivity. Soybean (Glycine max L. Merr.) is the world’s most important legume crop and is sensitive to O₃. Current ground-level [O₃] are estimated to reduce global soybean yields by 6% to 16%. In order to understand transcriptional mechanisms of yield loss in soybean, we examined the transcriptome of soybean flower and pod tissues exposed to elevated [O₃] using RNA-Sequencing.

Elevated [O₃] elicited a strong transcriptional response in flower and pod tissues, with increased expression of genes involved in signaling in both tissues. Flower tissues also responded to elevated [O₃] by increasing …