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Wetlands Ecology and Management

, Volume 15, Issue 4, pp 347–357 | Cite as

Effects of salinity on photosynthesis, leaf anatomy, ion accumulation and photosynthetic nitrogen use efficiency in five Indian mangroves

  • Paramita Nandy (Datta)
  • Sauren DasEmail author
  • Monoranjan Ghose
  • Robert Spooner-Hart
Original Paper

Abstract

Five species of mangroves (Bruguiera gymnorrhiza, Excoecaria agallocha, Heritiera fomes, Phoenix paludosa and Xylocarpus granatum) were investigated with respect to their photosynthesis rate, chlorophyll content, mesophyll conductance, specific leaf area, stomatal conductance and photosynthetic nitrogen use efficiency under saline (15–27 PPT) and non-saline (1.8–2 PPT) conditions. Some inorganic elements were estimated from the leaf samples to compare the concentrations with change in salinity. Elevated assimilation rate coupled with increased chlorophyll content, more mesophyll and stomatal conductance and higher specific leaf area in non-saline condition indicates that these mangroves can grow well even with minimal salinity in soil. In B. gymnorrhiza, E. agallocha and P. paludosa the optimum PAR acquisition for photosynthesis was higher under salt stress, while the maximal rate of assimilation was lower even with minimal salinity. H. fomes and X. granatum followed the opposite trend, where the peak photosynthesis rate was lower under non-saline conditions even at a higher irradiance than in the saline forest. This indicates less affinity of H. fomes and X. granatum to high substrate salinity. Accumulation of Na+ increased in plants in saline substrate, while in most of the species, salinity imposed reduction in Ca+ and Mg+ uptake. Increased K+ content can be attributed to high substrate level K+ in non-saline soil. Trace amount of salinity induced Cu++ detected in leaves of H. fomes may impart some toxic effects. Photosynthetic nitrogen use efficiency increased in non-saline soil that can be attributed to higher photosynthetic peak in most of the species and/or lower nitrogen accumulation in plant samples.

Keywords

Chlorophyll Mangrove PAR Photosynthesis Salinity Stomatal conductance 

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Copyright information

© Springer Science+Business Media, Inc. 2007

Authors and Affiliations

  • Paramita Nandy (Datta)
    • 1
  • Sauren Das
    • 1
    Email author
  • Monoranjan Ghose
    • 1
  • Robert Spooner-Hart
    • 2
  1. 1.Agricultural & Ecological Research UnitIndian Statistical InstituteKolkataIndia
  2. 2.Centre for Plant and Food Science (PAFS)University of Western SydneyPenrith South DCAustralia

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