Season-long elevation of ozone concentration to projected 2050 levels under fully open-air conditions substantially decreases the growth and production of soybean

Patrick B. Morgan, Timothy A. Mies, German A Bollero, Randall L Nelson, Stephen P Long

Research output: Contribution to journalArticle

Abstract

• Mean surface ozone concentration is predicted to increase 23% by 2050. Previous chamber studies of crops report large yield losses caused by elevation of tropospheric ozone, and have been the basis for projecting economic loss. • This is the first study with a food crop (soybean, Glycine max) using free-air gas concentration enrichment (FACE) technology for ozone fumigation. A 23% increase in ozone concentration from an average daytime ambient 56 p.p.b. to a treatment 69 p.p.b. over two growing seasons decreased seed yield by 20%. • Total above-ground net primary production decreased by 17% without altering dry mass allocation among shoot organs, except seed. Fewer live leaves and decreased photosynthesis in late grain filling appear to drive the ozone-induced losses in production and yield. • These results validate previous chamber studies suggesting that soybean yields will decrease under increasing ozone exposure. In fact, these results suggest that when treated under open-air conditions yield losses may be even greater than the large losses already reported in earlier chamber studies. Yield losses with elevated ozone were greater in the second year following a severe hailstorm, suggesting that losses caused by ozone might be exacerbated by extreme climatic events.

Original languageEnglish (US)
Pages (from-to)333-343
Number of pages11
JournalNew Phytologist
Volume170
Issue number2
DOIs
StatePublished - Apr 1 2006

Keywords

  • Atmospheric change
  • Climate change
  • Free-air gas concentration enrichment (FACE)
  • Primary production
  • Seed yield
  • Soybean (Glycine max)
  • Tropospheric ozone

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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