PJB-2023-331
Exploring the Interplay of Phytohormones and Polyamines in Drought-Stressed Cress (Lepidium sativum) Leaves
Khalid Y. Alsharafa
Abstract
A study was conducted to investigate the impact of prolonged drought stress on phytohormones and polyamines levels in cress leaves and their implications for understanding the plant's response to adverse environmental conditions. The study found that the levels of phytohormones such as OPDA, JA, JA-Ile, ABA, and SA increased in cress leaves during drought stress. ABA increased early on and continued to rise as drought stress progressed. Similarly, the phytohormone auxin indole-3-acetic acid exhibited similar changes in response to drought stress as ABA and SA. Cytokinins, specifically zeatin (ZT) and isopentenyl adenine (iP), played a diverse role in enhancing drought tolerance in cress leaves. ZT content declined rapidly, while iP content increased early and remained relatively stable during prolonged drought stress. On the other hand, gibberellic acid (GA3) levels decreased, while brassinolide (BL) exhibited a significant increase in content with prolonged drought stress. The study also investigated the impact of drought stress on polyamine levels in cress leaves and found that drought stress reduced the levels of polyamines, indicating their sensitivity to prolonged and severe drought stress. The study highlighted the complex regulatory mechanisms involved in plant adaptation to water scarcity. The interplay between different phytohormones, such as OPDA, JA, JA-Ile, ABA, SA, auxin, cytokinins, GA3, and BL, along with the modulation of polyamines, contributes to the plants ability to cope with drought stress and maintain physiological balance under adverse environmental conditions. These findings provide valuable insights into the dynamic response of cress leaves to drought stress and contribute to our understanding of drought tolerance mechanisms in plants.
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