Expression of cyanobacterial FBP/SBPase in soybean prevents yield depression under future climate conditions

Iris H. Köhler, Ursula M. Ruiz-Vera, Andy VanLoocke, Michell L. Thomey, Tom Clemente, Stephen P. Long, Donald R. Ort, Carl J. Bernacchi

Research output: Contribution to journalArticlepeer-review


Predictions suggest that current crop production needs to double by 2050 to meet global food and energy demands. Based on theory and experimental studies, overexpression of the photosynthetic enzyme sedoheptulose-1,7-bisphosphatase (SBPase) is expected to enhance C3 crop photosynthesis and yields. Here we test how expression of the cyanobacterial, bifunctional fructose-1,6/sedoheptulose-1,7-bisphosphatase (FBP/SBPase) affects carbon assimilation and seed yield (SY) in a major crop (soybean, Glycine max). For three growing seasons, wild-type (WT) and FBP/SBPase-expressing (FS) plants were grown in the field under ambient (400 mol mol1) and elevated (600 mol mol1) CO2 concentrations [CO2] and under ambient and elevated temperatures (+2.7 °C during daytime, +3.4 °C at night) at the SoyFACE research site. Across treatments, FS plants had significantly higher carbon assimilation (4-14%), Vc,max (5-8%), and Jmax (4-8%). Under ambient [CO2], elevated temperature led to significant reductions of SY of both genotypes by 19-31%. However, under elevated [CO2] and elevated temperature, FS plants maintained SY levels, while the WT showed significant reductions between 11% and 22% compared with plants under elevated [CO2] alone. These results show that the manipulation of the photosynthetic carbon reduction cycle can mitigate the effects of future high CO2 and high temperature environments on soybean yield.

Original languageEnglish (US)
Pages (from-to)715-726
Number of pages12
JournalJournal of experimental botany
Issue number3
StatePublished - 2017


  • Elevated CO
  • Elevated temperature
  • Free air CO enrichment
  • Glycine max
  • Sedoheptulose-1,7-bisphosphatase
  • Soy-T-FACE

ASJC Scopus subject areas

  • Physiology
  • Plant Science


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