Methane emissions from six crop species exposed to three components of global climate change: Temperature, ultraviolet-B radiation and water stress

Mirwais M. Qaderi, David M. Reid

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67 Citas (Scopus)

Resumen

We examined the effects of temperature, ultraviolet-B (UVB) radiation and watering regime on aerobic methane (CH4) emission from six crops-faba bean, sunflower, pea, canola, barley and wheat. Plants were grown in controlled-environment growth chambers under two temperature regimes (24/20 and 30/26°C), three levels of UVB radiation [0 (zero), 5 (ambient) and 10 (enhanced) kJ m-2 d-1] and two watering regimes (well watered and water stressed). A gas chromatograph with a flame ionization detector was used to measure CH4 emission rates [ng g-1 dry weight (DW) h-1] from detached fresh leaves of each species and attached leaves of pea plants. Plant growth [stem height, leaf area (LA) and aboveground dry matter (AG biomass)] and gas exchange [net CO2 assimilation (AN), transpiration (E) and water use efficiency (WUE)] were also determined. We found that higher temperature, water stress and UVB radiation at the zero and enhanced levels significantly enhanced CH4 emissions. Crop species varied in CH4 emission, which was highest for pea and lowest for barley. Higher temperature and water stress reduced all growth parameters, whereas ambient and enhanced UVB decreased stem height but increased LA and AG biomass. Higher temperature decreased AN and WUE but increased E, whereas water stress decreased AN but increased E and WUE. Zero and enhanced UVB reduced AN and E. Growth and gas exchange varied with species. Overall, CH4 emission was negatively correlated with stem height and AG biomass. We conclude that CH4 emissions may increase under climatic stress conditions and this extra source might contribute to the 'greenhouse effect'.

Idioma originalEnglish
Páginas (desde-hasta)139-147
Número de páginas9
PublicaciónPhysiologia Plantarum
Volumen137
N.º2
DOI
EstadoPublished - oct. 2009
Publicado de forma externa

ASJC Scopus Subject Areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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