Abstract
Indole-3-acetic acid (IAA) plays crucial roles in plant growth and stress tolerance. In present study, the effects of spraying different concentrations (0, 25, 50, 100 and 200 μmol/L) of IAA on the growth and cadmium (Cd) accumulation in lettuce (Lactuca sativa) were investigated. The lettuce exposed to Cd exhibited a substantial decline in growth, and the Cd content of them significantly increased. Spraying exogenous IAA resulted in alleviating the inhibitory of Cd toxicity to lettuce. The dry weight in shoots of lettuce increased by spraying with IAA compared with the Cd treatment alone, but the dry weight of roots had no significantly differences. Although exogenous IAA increased the root Cd content, it significantly reduced shoot Cd content, indicating its role in Cd transport. Therefore, spraying IAA effectively alleviated Cd toxicity and reduced Cd uptake in the edible parts of lettuce, and the 100 μmol/L IAA was the optimal dose.
Highlights
Lettuce (Lactuca sativa) is a common type of leafy vegetable that is widely cultivated worldwide
The objective was to determine whether exogenous Indole-3-acetic acid (IAA) could mitigate the Cd toxicity in lettuce by improving the growth and alleviating Cd accumulation of lettuce
Under Cd stress, the inhibition of growth was alleviated by spraying IAA solution, which increased plant height and stem diameter compared with Cd treatment alone
Summary
Lettuce (Lactuca sativa) is a common type of leafy vegetable that is widely cultivated worldwide. Some studies have demonstrated IAA alleviated Cd-induced toxicity on plants. IAA at low doses alleviate the Cd toxicity by regulating the ascorbate-glutathione cycle as well as activity of other antioxidants in Trigonella seedlings [9]. Agami and Mohamed investigate the resistance mechanism of IAA to cadmium tolerance in wheat seedlings, pre-treatment with IAA enhance the antioxidant defense activities in Cd stressed wheat, and enhance Cd tolerance [10]. The effect of different concentrations of IAA on the growth and Cd accumulation of lettuce under Cd stress were studied. The objective was to determine whether exogenous IAA could mitigate the Cd toxicity in lettuce by improving the growth and alleviating Cd accumulation of lettuce
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