Seasonal variation in photosynthetic pigments, osmotic solutes and osmotic potential of Capparis spinosa L. var. inermis Turra

Authors

  • Taghried M.El-Lamey Ecophysiology Unit, Plant Ecology and Ranges Department, Desert Research Center, Cairo, Egypt.
  • Mohamed M. Abd El-Maboud Ecophysiology Unit, Plant Ecology and Ranges Department, Desert Research Center, Cairo, Egypt.

Keywords:

alkaloids, Capparis spinosa, compatible solutes, osmotic adjustment

Abstract

The climate of the Mediterranean is characterized by mild winter, hot and dry summer and a long period of aridity. The osmotic adjustment is a known mechanism by which many plants can adapt to drought conditions. The investigation of the physiological responses and adaptation mechanism of wild plants can help identify metabolic products associated with improved tolerance to stress conditions. Thus, the aim of this study was to investigate the effect of seasonal variations in the climatic conditions at Mediterranean region on the photosynthetic pigments, content of osmotic solutes and their contribution to change the total osmotic potential of Capparis spinosa L. var. inermis Turra under stress condition in dry season. The results indicated that Capparis spinosa was rich in photosynthetic pigments in winter and the contents of Chl.a and carotenoid were significantly affected by seasonal variations in climatic conditions and decreased significantly in dry season. While the content of Chl. b showed no significant change by season. The content of proline tended to increase during a cold climate in winter, while proline betaine (stachydrine ) was detected in high concentration during the dry period of summer. The results indicated that the Mediterranean evergreen plant Capparis spinosa responded to stress conditions in dry season through the accumulation of soluble sugar, water soluble stachydrine alkaloid and ions as compatible solutes to assist in decrease the osmotic potential and increase the water inlet to the cells. Determining the role of stachydrine in improving the tolerance of Capparis spinosa to stress conditions needs more investigations, also, the possibility of increasing the tolerance of economic plants to water deficit by enhancing the synthesis of these compounds is suggested for further studies.

Published

15.01.2022