Abstract
The effect of 24-epibrassinolide on growth of pigeon pea [Cajanus cajan (L.) Millsp.] under aluminium toxicity was studied. 24-EBL reduced the impact of Al stress on plant growth. Particularly 24-EBL reduced the inhibitory impact of aluminium toxicity on root growth which was further manifested in overall improvement of vegetative growth. Application of 24-epibrassinolide removed the inhibitory influence of Al nodulation. The growth stimulation in Cajanus plants by 24-EBL under Al stress was associated with elevated levels of chlorophylls, nucleic acids and soluble proteins. 24-Epibrassinolide application enhanced proline content in Al3+ stressed Cajanus plants. Further, the supplementation of 24-epibrassinolide to Al stress treatments increased the activities of antioxidative enzymes viz., catalase [EC 1.11.1.6]; peroxidase [EC 1.11.1.7]; superoxide dismutase [EC 1.15.1.1] and ascorbate peroxidase [EC 1.11.1.11]. Lipid peroxidation induced by Al was found reduced with the supplementation of 24-epibrassinolide. The present studies demonstrated the ameliorating capability of 24-epibrassinolide on the Al induced inhibition of plant growth of C. cajan.
Highlights
Aluminium is the third most abundant element in the earth’s crust
The present study aimed to explore the possibility of ameliorating aluminium toxicity in pigeon pea [Cajanus cajan (L.) Millsp.] plant by employing 24-epibrassinolide
Aluminium toxicity significantly reduced the growth of pigeon pea plants (Table 1)
Summary
Aluminium is the third most abundant element (after oxygen and silicon) in the earth’s crust. The prevalence of toxic Al3+ cations in acidic soils (pH < 5.0) is a major limitation to crop production around the world [1] [2]. Excess of aluminium is a major soil constraint to food and biomass production [2]. It is estimated that 40% of the arable soils of the world are acidic and aluminium poisoning is an important agricultural problem. Aluminium toxicity severely impairs root growth and interferes with water and mineral nutrient uptake. Excess Al interferes cellular redox equilibrium and boosts the accumulation of reactive oxygen species (ROS), resulting in oxidative damage [5]. Enhanced production of ROS results in oxidative damage to nucleic acids, pigments, proteins and membrane lipids [6]-[8]
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