Calcium availability regulates antioxidant system, physio-biochemical activities and alleviates salinity stress mediated oxidative damage in soybean seedlings

Authors

  • Amr Adel Elkelish Suez Canal University, Egypt https://orcid.org/0000-0002-1683-8436
  • Taghreed S. Alnusaire Jouf University, Saudi Arabia
  • Mona H. Soliman Taibah University, Al‑Sharm, Yanbu, Saudi Arabia https://orcid.org/0000-0002-9102-4790
  • Salah Gowayed Suez Canal University, Egypt
  • Hoda H. Senousy Cairo University, Giza, Egypt
  • Shah Fahad University of Swabi, Khyber Pakhtunkhwa, Pakistan

DOI:

https://doi.org/10.5073/JABFQ.2019.092.036

Abstract

Salinity is considered as one of the devastating abiotic stress factors and global climate change has further worsened the situation. Present experiments were aimed to evaluate the role of calcium (Ca) availability on growth and salinity tolerance mechanisms in soybean. Seedlings were grown with (2 mM Ca) and without Ca supplementation and modulation in key physiological and biochemical parameters were studied. Salinity (100 mM NaCl) stress resulted in growth reduction in terms of height and biomass accumulation, which was more pronounced in Ca-deficient plants. Relative to control (Ca deficient) and NaCl stressed plants, Ca supplemented seedlings exhibited higher relative water content, pigment synthesis and the photosynthetic efficiency. Ca availability affected the synthesis of proline, glycine betaine and soluble sugars under normal and saline growth conditions. Optimal Ca supplementation up-regulated the activities of antioxidant enzymes assayed and the contents of non-enzymatic antioxidants (ascorbate, glutathione, and tocopherol) thereby reflecting in amelioration of NaCl induced oxidative damage. Moreover, increased accumulation of phenols due to Ca supplementation and the amelioration of NaCl mediated decline if nitrate reductase activity was observed. More importantly, Ca availability reduced the accumulation of Na under control and NaCl stressed conditions restricting the damging effects on metabolism. Availability of optimal Ca potentially regulates the salinity tolerance mechanisms in soybean by maintaining osmoregulation and antioxidant metabolism.

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Published

2019-10-09

Issue

Vol. 92 (2019): Journal of Applied Botany and Food Quality

Section

Plant stress and tolerance

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