Interaction Between Salinity and Elevated CO2: A Physiological Approach
This review presents a detailed analysis of the papers published over the past 10 years addressing the response of several physiological parameters to the interaction between salinity and elevated CO2, which are both anticipated to affect more severely future environmental conditions. This review demonstrates that the response to this interaction is species and even cultivar specific and that the predicted higher biomass production at elevated CO2 is not a general trend. Most strategies to cope with salt stress involve active regulation of water potential and stomatal conductance, active regulation of photosynthetic metabolism as a whole, and active regulation of other salt-tolerance mechanisms. However, these salt-tolerance mechanisms are energetically expensive, and even if under elevated CO2 there is generally higher energy supply than under ambient CO2, biomass production will depend on the trade-off between the anabolic (photosynthesis) and catabolic (chloro-, photo-, and basal-respiration) rates, as well as the ability to control the stomatal conductance.
KeywordsSalt Stress Stomatal Conductance Osmotic Adjustment High Photosynthetic Rate Radical Oxygen Species
We wish to thank MEC-BFU2007-60523/BFI, ETORTEK 07/44, and GRUPO GV-IT 326-10 for the financial support. U. Pérez-López was the recipient of a grant from the Departamento de Educación, Universidades e Investigación del Gobierno Vasco (Spain).
- FAO (2000) Global network on integrated soil management for sustainable use of salt-affected soils. http://www.fao.org/org/AGL/agll/spush/intro.htm. Accessed 10 May 2004
- García-Sánchez F, Syvertsen JP (2006) Salinity tolerance of Cleopatra mandarin and Carrizo citrange citrus rootstock seedlings is affected by CO2 enrichment during growth. J Am Soc Hortic Sci 131:24–31Google Scholar
- IPCC (2007) Summary of Policymakers of the synthesis report of the IPCC fourth assessment report. http://www.ipcc.ch. Accessed 20 Feb 2008
- Li JH, Sagi M, Gale J, Volokita M, Novoplansky A (1999a) Response of tomato plants to saline water as affected by carbon dioxide supplementation. I. Growth, yield and fruit quality. J Hortic Sci Biotechnol 74:232–237Google Scholar
- Li JH, Gale J, Novoplansky A, Barak S, Volokita M (1999b) Response of tomato plants to saline water as affected by carbon dioxide supplementation. II. Physiological responses. J Hortic Sci Biotechnol 74:238–242Google Scholar
- Munns R (1993) Physiological processes limiting plant growth in saline soils: some dogmas and hypotheses. Plant Cell Environ 16:14–24Google Scholar
- Robredo A, Pérez-López U, Sainz de la Maza H, González-Moro B, Lacuesta M, Mena-Petite A, Muñoz-Rueda A (2007) Concurrent effects of CO2 enrichment and water stress on barley plant water relations and gas exchange under controlled environment conditions. Environ Exp Bot 59:252–263CrossRefGoogle Scholar
- Takagi M, El-Shemy HA, Sasaki S, Toyama S, Kanai S, Saneoka H, Fujita K (2009) Elevated CO2 concentration alleviates salinity stress in tomato plant. Acta Agric Scand B 59:87–96Google Scholar