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Plant roots represent highly unexplored biological frontier. Roots metabolically produce remarkably diverse group of
bioactive compounds which functions as phytoalexins (parasite growth inhibitor), phytotoxins (toxic for plant growth),
phytoanticipins (low molecular weight antimicrobial compounds) and germination inhibitors etc. In the present study 2-
week-old Sorghum bicolor seedlings were transferred to ¼ strength Hoagland solution. After one-week culturing in
hydroponic system seedlings were subjected to various levels of abiotic stress (ultraviolet, ultrasound and heat) in
combination with permeabilization (to make cell wall perforable) using Tween 20. The exudates were collected after 48
hours of stress exposure. Collected root exudates were evaluated for their phenolic contents and antioxidant potential.
Sorghum bicolor exposed to different levels of abiotic stress showed a substantial release of bioactive compounds which
exhibit significant antioxidant potential. The study revealed different stress levels and exposure time affect root exudation
exhibiting maximal exudation after ultraviolet (UV) exposure (136.02±2.01µg / 90.0mL), followed by ultrasound (65.26 ±
1.49 µg / 90.0mL) and heat stress (50.12±0.85 µg / 90.0mL). This study provides an amazing contribution of root exudation
as bioactive source and making their fruitful use for various purposes like pharmaceutical applications.
Sadaf Yaqoob, Haq Nawaz Bhatti, Bushra Sultana, Muhammad Shahid. (2020) PROGNOSTICATING THE POTENTIAL OF Sorghum bicolor ROOT EXUDATES IN RESPONSE TO ABIOTIC STRESS, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 6.
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