Differential CO2 effect on primary carbon metabolism of flag leaves in durum wheat (Triticum durum Desf.)

作者：Aranjuelo Iker^*; Erice Gorka; Sanz Saez Alvaro; Abadie Cyril; Gilard Francoise; Gil Quintana Erena; Avice Jean Christophe; Staudinger Christiana; Wienkoop Stefanie; Araus Jose L; Bourguignon Jacques; Irigoyen Juan J; Tcherkez Guillaume

来源：Plant, Cell and Environment, 2015, 38(12): 2780-2794.

DOI：10.1111/pce.12587

• carboxylation
• isotope labelling
• metabolomics
• photosynthesis
• proteomics
• Rubisco

C sink/source balance and N assimilation have been identified as target processes conditioning crop responsiveness to elevated CO2. However, little is known about phenology-driven modifications of C and N primary metabolism at elevated CO2 in cereals such as wheat. Here, we examined the differential effect of elevated CO2 at two development stages (onset of flowering, onset of grain filling) in durum wheat (Triticum durum, var. Sula) using physiological measurements (photosynthesis, isotopes), metabolomics, proteomics and N-15 labelling. Our results show that growth at elevated CO2 was accompanied by photosynthetic acclimation through a lower internal (mesophyll) conductance but no significant effect on Rubisco content, maximal carboxylation or electron transfer. Growth at elevated CO2 altered photosynthate export and tended to accelerate leaf N remobilization, which was visible for several proteins and amino acids, as well as lysine degradation metabolism. However, grain biomass produced at elevated CO2 was larger and less N rich, suggesting that nitrogen use efficiency rather than photosynthesis is an important target for improvement, even in good CO2-responsive cultivars.

• 出版日期2015-12
• 单位中国地震局