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- Title
Gibberellic Acid Alleviates Cadmium-Induced Seed Germination Inhibition through Modulation of Carbohydrate Metabolism and Antioxidant Capacity in Mung Bean Seedlings.
- Authors
Kaur, Harmanjit; Nazir, Faroza; Hussain, Sofi Javed; Kaur, Rupinder; Rajurkar, Ashish B.; Kumari, Sarika; Siddiqui, Manzer H.; Mahajan, Moksh; Khatoon, Sayeda; Khan, M. Iqbal R.
- Abstract
Gibberellins (GA) are the decisive players in seed germination whose functionality could be adversely affected by the presence of cadmium (Cd); however, the underlying mechanisms are unclear. Eco-toxicological effects of Cd (0, 25, 50, 75, and 100 µM) on the early stages of ontogenesis in a mung bean variety (ML-2056) were investigated. Seed germination characteristics along with Cd-tolerance index were recorded at the seventh day of germination. Additionally, endogenous gibberellic acid (GA3) level, amylase activity, oxidative stress, and the antioxidant defense system were also investigated in Cd-stressed germinating seedlings. Results revealed that Cd reduced seed germination and interfered with GA synthesis in a concentration-dependent manner. Further, to validate the role of GA in Cd-tolerance, experiments were executed to explore the effect of seed priming with GA3 and its biosynthesis inhibitor paclobutrazol (PBZ) on ML-2056 under Cd stress. Application of GA3 improved the activities of amylase and carbohydrate-metabolizing enzymes, the antioxidant defense system, and sustained lower H2O2 and TBARS contents, whereas PBZ caused a significant reduction in growth and decreased endogenous GA3 content in Cd-stressed ML-2056, suggesting a crucial role of GA synthesis in reversing Cd-induced negative effects. Overall, GA synthesis played a crucial role in mitigating Cd toxicity in mung bean, which might be used as a criterion for developing Cd-stress-tolerant genotypes.
- Subjects
CARBOHYDRATE metabolism; GIBBERELLIC acid; OXIDANT status; GERMINATION; MUNG bean; SEEDLINGS; PACLOBUTRAZOL
- Publication
Sustainability (2071-1050), 2023, Vol 15, Issue 4, p3790
- ISSN
2071-1050
- Publication type
Article
- DOI
10.3390/su15043790