Growth and physiological responses of canola (Brassica napus) to three components of global climate change: Temperature, carbon dioxide and drought

Mirwais M. Qaderi, Leonid V. Kurepin, David M. Reid

Résultat de recherche: Articleexamen par les pairs

187 Citations (Scopus)

Résumé

Elevated CO2 appears to be a significant factor in global warming, which will likely lead to drought conditions in many areas. Few studies have considered the interactive effects of higher CO2, temperature and drought on plant growth and physiology. We grew canola (Brassica napus cv. 45H72) plants under lower (22/18°C) and higher (28/24°C) temperature regimes in controlled-environment chambers at ambient (370 μmol mol -1) and elevated (740 μmol mol-1) CO2 levels. One half of the plants were watered to field capacity and the other half at wilting point. In three separate experiments, we determined growth, various physiological parameters and content of abscisic acid (ABA), indole-3-acetic acid and ethylene. Drought-stressed plants grown under higher temperature at ambient CO2 had decreased stem height and diameter, leaf number and area, dry matter, leaf area ratio, shoot/root weight ratio, net CO2 assimilation and chlorophyll fluorescence. However, these plants had increased specific leaf weight, leaf weight ratio and chlorophyll concentration. Elevated CO2 generally had the opposite effect, and partially reversed the inhibitory effects of higher temperature and drought on leaf dry weight accumulation. This study showed that higher temperature and drought inhibit many processes but elevated CO2 partially mitigate some adverse effects. As expected, drought stress increased ABA but higher temperature inhibited the ability of plants to produce ABA in response to drought.

Langue d'origineEnglish
Pages (de-à)710-721
Nombre de pages12
JournalPhysiologia Plantarum
Volume128
Numéro de publication4
DOI
Statut de publicationPublished - déc. 2006
Publié à l'externeOui

ASJC Scopus Subject Areas

  • Physiology
  • Genetics
  • Plant Science
  • Cell Biology

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