Osmotic Adjustment of Natural Vegetation in Saline Soils


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Authors

  • K NANCY JASMIN Department of Soil Science and Agricultural Chemistry Agricultural College, Bapatla - 522 101, Andhra Pradesh
  • P PRASUNA RANI Department of Soil Science and Agricultural Chemistry Agricultural College, Bapatla - 522 101, Andhra Pradesh
  • Y ASHOKA RANI Department of Soil Science and Agricultural Chemistry Agricultural College, Bapatla - 522 101, Andhra Pradesh
  • R LAKSHMI PATHY Department of Soil Science and Agricultural Chemistry Agricultural College, Bapatla - 522 101, Andhra Pradesh

Abstract

Leaf samples of natural vegetation collected in selected areas of variable salinity (ECe - 4, 12, 22 and 36 dS m ) were assayed for different parameters viz.,  photosynthetic pigments, relative water content (RWC), nitrate reductase activity (NRA), proline, membrane injury index (MII) and ionic ratios to understand the osmoregulation mechanisms in plants. The results showed that the biochemical parameters like photosynthetic pigments, nitrate reductase activity and RWC followed a declining trend while, proline and MII increased with increase in salinity from 4 to 36 dS m-1. The concentration of proline was maximum in P. oleracea at 36 dS m of conductivity while, it was least in C. sparsiflorus at 4 dSm-1. The content of magnesium in leaves decreased whereas, potassium and calcium followed an increasing trend resulting in fall of Na+ /K+ ratio and rise in Ca2+ /Mg2+ ratio with increase in salinity. The correlations revealed that the electrical conductivity was positively and significantly correlated with proline, MII and Ca/Mg ratio, whereas it was negatively correlated with photosynthetic pigments, RWC, NR activity and Na/K ratio at 1% level of significance.

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NANCY JASMIN, K., PRASUNA RANI, P., ASHOKA RANI, Y., & LAKSHMI PATHY, R. (2017). Osmotic Adjustment of Natural Vegetation in Saline Soils. Journal of the Indian Society of Coastal Agricultural Research, 35(1). https://epubs.icar.org.in/index.php/JISCAR/article/view/75999