Journal
PLANTS-BASEL
Volume 10, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/plants10040796
Keywords
antioxidant enzymes; Cajanus cajan; exogenous proline; metal stress; growth traits
Categories
Funding
- National Key R&D Program of China [2017YFD0600205]
- National Natural Science Foundation of China [31930076]
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The study reveals the alleviating effect of exogenous proline on cadmium-induced oxidative stress in pigeon pea plants, reducing damage by increasing antioxidant enzyme activities, improving photosynthetic attributes, and enhancing nutrient uptake.
Proline plays a significant role in the plant response to stress conditions. However, its role in alleviating metal-induced stresses remains elusive. We conducted an experiment to evaluate the ameliorative role of exogenous proline on cadmium-induced inhibitory effects in pigeon pea subjected to different Cd treatments (4 and 8 mg/mL). Cadmium treatments reduced photosynthetic attributes, decreased chlorophyll contents, disturbed nutrient uptake, and affected growth traits. The elevated activity of antioxidant enzymes (superoxide dismutase, catalase, and glutathione peroxidase), in association with relatively high contents of hydrogen peroxide, thiobarbituric acid reactive substances, electrolyte leakage, and endogenous proline, was measured. Exogenous proline application (3 and 6 mM) alleviated cadmium-induced oxidative damage. Exogenous proline increased antioxidant enzyme activities and improved photosynthetic attributes, nutrient uptake (Mg2+, Ca2+, K+), and growth parameters in cadmium-stressed pigeon pea plants. Our results reveal that proline supplementation can comprehensively alleviate the harmful effects of cadmium on pigeon pea plants.
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