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Responses of Selected C3 and C4 Halophytes to Elevated CO2 Concentration under Salinity


Affiliations
1 Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
 

Halophytes have superior capacity to withstand soil salinity and are appropriate resources to study the mechanism of salt tolerance which can be harnessed to develop crops to withstand salinity. In this communication, we report the effect of salinity (200 mM NaCl) and elevated carbon dioxide (CO2) treatments in tandem, on select halophytes that have different photosynthetic pathways: C3 and C4. The plants were raised in ambient (380 ppm) and enriched (500 ppm) concentrations of CO2 using a mini-FACE facility. Total chlorophyll content, total soluble sugar concentration, lipid peroxidation level and electrolyte leakage were measured from fresh leaf samples collected at different time points. The results show a positive effect for elevated CO2 concentration on salt tolerance in both C3 and C4 plants, and indicate that halophytes may benefit from rising atmospheric CO2 concentration. The results also suggest that C4 halophytes may benefit from the rising atmospheric CO2 concentration than C3 halophytes.

Keywords

Elevated Carbon Dioxide, Halophytes, Salinity, Photosynthetic Pathway, Sesuvium portulacastrum, Suaeda nudiflora.
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  • Responses of Selected C3 and C4 Halophytes to Elevated CO2 Concentration under Salinity

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Authors

Saranya Jothiramshekar
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Jenifer Joseph Benjamin
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Rani Krishnasamy
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Anand Kumar Pal
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Suja George
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Rajalakshmi Swaminathan
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India
Ajay K. Parida
Department of Plant Molecular Biology, M.S. Swaminathan Research Foundation, III Cross Street, Taramani Institutional Area, Taramani, Chennai 600 113, India

Abstract


Halophytes have superior capacity to withstand soil salinity and are appropriate resources to study the mechanism of salt tolerance which can be harnessed to develop crops to withstand salinity. In this communication, we report the effect of salinity (200 mM NaCl) and elevated carbon dioxide (CO2) treatments in tandem, on select halophytes that have different photosynthetic pathways: C3 and C4. The plants were raised in ambient (380 ppm) and enriched (500 ppm) concentrations of CO2 using a mini-FACE facility. Total chlorophyll content, total soluble sugar concentration, lipid peroxidation level and electrolyte leakage were measured from fresh leaf samples collected at different time points. The results show a positive effect for elevated CO2 concentration on salt tolerance in both C3 and C4 plants, and indicate that halophytes may benefit from rising atmospheric CO2 concentration. The results also suggest that C4 halophytes may benefit from the rising atmospheric CO2 concentration than C3 halophytes.

Keywords


Elevated Carbon Dioxide, Halophytes, Salinity, Photosynthetic Pathway, Sesuvium portulacastrum, Suaeda nudiflora.

References





DOI: https://doi.org/10.18520/cs%2Fv115%2Fi1%2F129-135