Effects of Salt Stress on Plant Growth, Nutrient Partitioning, Chlorophyll Content, Leaf Relative Water Content, Accumulation of Osmolytes and Antioxidant Compounds in Pepper (Capsicum annuum L.) Cultivars

  • Mathias J. HAND University of Yaounde I, Faculty of Science, Department of Biology and plant Physiology, Laboratory of Biotechnology and Environment, Unit of Physiology and Plant Improvement P.O. Box 812 Yaoundé
  • Victor D. TAFFOUO University of Douala, Faculty of Science, Department of Botany, P.O. Box 24157 Douala
  • Alphonse E. NOUCK University of Bamenda, Faculty of Sciences, Department of Biological Sciences, P.O. Box 39, Bamenda
  • Kitio P.J. NYEMENE University of Douala, Faculty of Science, Department of Botany, P.O. Box 24157 Douala
  • Brice TONFACK University of Yaounde I, Faculty of Science, Department of Biology and plant Physiology, Laboratory of Biotechnology and Environment, Unit of Physiology and Plant Improvement P.O. Box 812 Yaounde
  • Tekam L. MEGUEKAM University of Yaounde I, Department of Biological Sciences, P.O. Box 47 Yaounde
  • Emmanuel YOUMBI University of Yaounde I, Faculty of Science, Department of Biology and plant Physiology, Laboratory of Biotechnology and Environment, Unit of Physiology and Plant Improvement P.O. Box 812 Yaounde

Abstract

The salinity of soil is among the most important abiotic stresses which limit agricultural productivity worldwide. The effects of salinity on growth, nutrient partitioning, chlorophyll, leaf relative water content, osmolytes accumulation and antioxidant compounds of pepper (Capsicum annuum L.) cultivars (‘Granada’, ‘Goliath’ and ‘Nobili’), widely used in Cameroon, were investigated. Plants were subjected to four levels of NaCl (0, 50, 100 and 200 mM) at early seedling growth stage of plant development. Application of NaCl treatment led to a significant increase in total  soluble  sugars,  proline; soluble proteins; total free amino acids content, peroxydase and superoxide dismutase activity and total phenolic content in salt-tolerant ‘Granada’ and ‘Nobili’ compared to salt-sensitive ‘Goliath’ and untreated plants, on the contrary, decreased in root dry weight, shoot dry weight, number of leaves, shoot length, stem diameter, total leaf area, chlorophyll and leaf relative water content in ‘Goliath’ at low salinity level. Flavonoid content, K, Ca and Mg concentrations were significantly reduced with increasing salinity in all cultivars. The highest Na concentrations were detected in the leaves while the lowest were recorded in the roots of ‘Goliath’ at high salinity level. The salt sensitivity of ‘Goliath’ seems to be increased osmotic adjustment through the strongly accumulation of Na in leaves while the salt tolerance of ‘Granada’ was related to its induce of antioxidative enzyme system more efficiently, resulting in higher osmolytes accumulation under salinity. ‘Granada’ was more tolerant and stable in physiological and biochemical traits suggesting that it could be grown in salt-affected soils.

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Published
2017-09-15
How to Cite
HAND, M. J., TAFFOUO, V. D., NOUCK, A. E., NYEMENE, K. P., TONFACK, B., MEGUEKAM, T. L., & YOUMBI, E. (2017). Effects of Salt Stress on Plant Growth, Nutrient Partitioning, Chlorophyll Content, Leaf Relative Water Content, Accumulation of Osmolytes and Antioxidant Compounds in Pepper (Capsicum annuum L.) Cultivars. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 45(2), 481-490. https://doi.org/10.15835/nbha45210928
Section
Research Articles