Elevated ozone reduces photosynthetic carbon gain by accelerating leaf senescence of inbred and hybrid maize in a genotype-specific manner

Craig R. Yendrek, Gorka Erice, Christopher M. Montes, Tiago Tomaz, Crystal A. Sorgini, Patrick J. Brown, Lauren M. McIntyre, Andrew Leakey, Elizabeth Ainsworth

Research output: Contribution to journalArticle

Abstract

Exposure to elevated tropospheric ozone concentration ([O3]) accelerates leaf senescence in many C3 crops. However, the effects of elevated [O3] on C4 crops including maize (Zea mays L.) are poorly understood in terms of physiological mechanism and genetic variation in sensitivity. Using free air gas concentration enrichment, we investigated the photosynthetic response of 18 diverse maize inbred and hybrid lines to season-long exposure to elevated [O3] (~100 nl L−1) in the field. Gas exchange was measured on the leaf subtending the ear throughout the grain filling period. On average over the lifetime of the leaf, elevated [O3] led to reductions in photosynthetic CO2 assimilation of both inbred (−22%) and hybrid (−33%) genotypes. There was significant variation among both inbred and hybrid lines in the sensitivity of photosynthesis to elevated [O3], with some lines showing no change in photosynthesis at elevated [O3]. Based on analysis of inbred line B73, the reduced CO2 assimilation at elevated [O3] was associated with accelerated senescence decreasing photosynthetic capacity and not altered stomatal limitation. These findings across diverse maize genotypes could advance the development of more O3 tolerant maize and provide experimental data for parameterization and validation of studies modeling how O3 impacts crop performance.

Original languageEnglish (US)
Pages (from-to)3088-3100
Number of pages13
JournalPlant Cell and Environment
Volume40
Issue number12
DOIs
StatePublished - Dec 2017

Fingerprint

Ozone
ozone
Zea mays
Carbon
Genotype
corn
carbon
genotype
filling period
Photosynthesis
leaves
assimilation (physiology)
crops
carbon dioxide
free air carbon dioxide enrichment
photosynthesis
Gases
inbred lines
Validation Studies
gas exchange

Keywords

  • Zea mays
  • photosynthesis
  • senescence
  • stomatal conductance
  • tropospheric ozone

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Elevated ozone reduces photosynthetic carbon gain by accelerating leaf senescence of inbred and hybrid maize in a genotype-specific manner. / Yendrek, Craig R.; Erice, Gorka; Montes, Christopher M.; Tomaz, Tiago; Sorgini, Crystal A.; Brown, Patrick J.; McIntyre, Lauren M.; Leakey, Andrew; Ainsworth, Elizabeth.

In: Plant Cell and Environment, Vol. 40, No. 12, 12.2017, p. 3088-3100.

Research output: Contribution to journalArticle

Yendrek, Craig R. ; Erice, Gorka ; Montes, Christopher M. ; Tomaz, Tiago ; Sorgini, Crystal A. ; Brown, Patrick J. ; McIntyre, Lauren M. ; Leakey, Andrew ; Ainsworth, Elizabeth. / Elevated ozone reduces photosynthetic carbon gain by accelerating leaf senescence of inbred and hybrid maize in a genotype-specific manner. In: Plant Cell and Environment. 2017 ; Vol. 40, No. 12. pp. 3088-3100.
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