Adaptive eco-physiological mechanisms of Alhagi graecorum in response to severe aridity in the Western Desert of Egypt

Abstract

The present work aimed to evaluate some eco-physiological responses of Alhagi graecorum to elucidate its osmotic adjustment and physiological adaptation mechanisms to withstand hyper-aridity. The plant samples were collected from eight locations in the Dakhla Oasis during the winter and summer of 2017. The chlorophyll (Chl a & b) contents and their ratio increased significantly during summer enabling the plants to adapt to light condition changes. There was a greater accumulation of anions and cations in plant tissues during winter more than in summer except, for K ⁺that exhibited the opposite trend during summer. Soluble sugars (SS) and soluble proteins (SP) were higher than total free amino acids (TAA) during summer. The total phenolics (Ph) and total antioxidants (Anti. Ox.) in this plant were higher during winter than in summer; whereas total flavonoids (Flav) displayed the opposite response. The results indicated close relationships among the high macronutrient contents, cool-moist conditions, and Ph and Anti. Ox. accumulation in winter. Ph and Anti. Ox. served as active compounds for perseverance or raw material for metabolic processes that let such plants maintain an abundant rate of growth under severe arid conditions.

Keywords:

• Alhagi graecorum
• chlorophyll
• soluble sugars
• total antioxidants
• total flavonoids
• total phenolics

Acknowledgments

The authors are indebted to Prof. Taha Ramadan professor of plant ecology, Botany and Microbiology Dept., Faculty of Science, Assiut University ([email protected]) for his critical reading and revision of this research article.

This work was financially supported by the Academy of Scientific Research & Technology (ASRT), Egypt Grant no. 6371 under the project Science Up, and ASRT is the second affiliation.

Disclosure statement

The authors declare that they have no conflict of interest.