Nitric oxide alleviates lead toxicity by inhibiting lead translocation and regulating root growth in watermelon seedlings

다국어 초록 (Multilingual Abstract)

Lead (Pb) is one of the most abundant toxic heavy metals, which have a serious impact on the growth and yield of crop plants.
Nitric oxide (NO) is a natural signaling molecule that regulates the growth and productivity of plants. Here, exogenous NOwas found to enhance Pb tolerance in watermelon, which resulted in more Pb restriction in roots and less up-translocatedPb to aerial parts. Pb stress, however, led to an increase in shoot dry weight, root biomass, root relative water content, leafmalondialdehyde (MDA) content, and the total soluble protein content in leaves and roots. By contrast, shoot height andfresh weight, leaf biomass, and root MDA content were decreased under Pb stress. NO treatments alleviated Pb toxicity bydecreasing Pb translocation, enhancing root growth (elongation and biomass), inducing antioxidant enzymes activities, andreducing root MDA contents in watermelon seedlings. In conclusion, our results provide useful insights into the mechanismof Pb tolerance in cucurbit crops and information for the cultivation management of watermelon in the presence of thisheavy metal (Pb).

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