Abstract

• Changes in leaf-area index (LAI) may alter ecosystem productivity in elevated [CO 2 ] or [O 3 ]. By increasing the apparent quantum yield of photosynthesis (φ c,max ), elevated [CO 2 ] may increase maximum LAI. However, [O 3 ] when elevated independently accelerates senescence and may reduce LAI. • Large plots (20 m diameter) of soybean (Glycine max) were exposed to ambient (approx. 370 μmol mol -1 ) or elevated (approx. 550 μmol mol -1 ) CO 2 or 1.2 times ambient [O 3 ] using soybean free-air concentration enrichment (SoyFACE). • In 2001 elevated CO 2 had no detectable effect on maximum LAI, but in 2002 maximum LAI increased by 10% relative to ambient air. Elevated [CO 2 ] also increased the φ c,max of shade leaves in both years. Elevated [CO 2 ] delayed LAI loss to senescence by approx. 54% and also increased leaf-area duration. Elevated [O 3 ] accelerated senescence, reducing LAI by 40% near the end of the growing season. No effect of elevated [O 3 ] on photosynthesis was detected. • Elevated [CO 2 ] or [O 3 ] affected LAI primarily by altering the rate of senescence; knowledge of this may aid in optimizing future soybean productivity.

Original languageEnglish (US)
Pages (from-to)145-155
Number of pages11
JournalNew Phytologist
Volume169
Issue number1
DOIs
StatePublished - Jan 1 2006

Fingerprint

Ozone
Carbon Monoxide
Soybeans
ozone
leaf area index
soybeans
Photosynthesis
Air
free air carbon dioxide enrichment
photosynthesis
Ecosystem
Glycine max
shade
leaf area
growing season
air
duration
ecosystems

Keywords

  • Leaf-area index (LAI)
  • Senescence
  • SoyFACE (soybean free-air concentration enrichment)
  • Soybean (Glycine max)

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

How does elevated CO 2 or ozone affect the leaf-area index of soybean when applied independently? . / Dermody, Orla; Long, Stephen P.; DeLucia, Evan H.

In: New Phytologist, Vol. 169, No. 1, 01.01.2006, p. 145-155.

Research output: Contribution to journalArticle

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