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Acclimation to high CO₂ in maize is related to water status and dependent on leaf rank
- PRINS, ANNEKE, MUKUBI, JOSEPHINE MUCHWESI, PELLNY, TILL K., VERRIER, PAUL J., BEYENE, GETU, LOPES, MARTA SILVA, EMAMI, KAVEH, TREUMANN, ACHIM, LELARGE-TROUVERIE, CAROLINE, NOCTOR, GRAHAM, KUNERT, KARL J., KERCHEV, PAVEL, FOYER, CHRISTINE H.
- Plant, cell and environment 2011 v.34 no.2 pp. 314-331
- Zea mays, acclimation, carbon dioxide, carbon dioxide enrichment, corn, leaves, photorespiration, proteome, transcriptome, transpiration
- The responses of C₃ plants to rising atmospheric CO₂ levels are considered to be largely dependent on effects exerted through altered photosynthesis. In contrast, the nature of the responses of C₄ plants to high CO₂ remains controversial because of the absence of CO₂-dependent effects on photosynthesis. In this study, the effects of atmospheric CO₂ availability on the transcriptome, proteome and metabolome profiles of two ranks of source leaves in maize (Zea mays L.) were studied in plants grown under ambient CO₂ conditions (350 +/− 20 µL L⁻¹ CO₂) or with CO₂ enrichment (700 +/− 20 µL L⁻¹ CO₂). Growth at high CO₂ had no effect on photosynthesis, photorespiration, leaf C/N ratios or anthocyanin contents. However, leaf transpiration rates, carbohydrate metabolism and protein carbonyl accumulation were altered at high CO₂ in a leaf-rank specific manner. Although no significant CO₂-dependent changes in the leaf transcriptome were observed, qPCR analysis revealed that the abundance of transcripts encoding a Bowman-Birk protease inhibitor and a serpin were changed by the growth CO₂ level in a leaf rank specific manner. Moreover, CO₂-dependent changes in the leaf proteome were most evident in the oldest source leaves. Small changes in water status may be responsible for the observed responses to high CO₂, particularly in the older leaf ranks.