期刊
SUSTAINABILITY
卷 13, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/su132112329
关键词
hormone application; photosynthetic attributes; soluble salts; Pb toxicity; vegetables
资金
- University of Tabuk
Plant growth regulators can improve the growth of carrots under lead stress conditions, reduce chlorophyll content in leaves, decrease lead uptake, and regulate the concentration of antioxidant compounds.
Toxicity of heavy-metals in soil is a major constraint for the production of carrots (Daucus carota L.). Different plant growth regulators are being used to overcome this problem. It has been found that plant growth regulators induce stress tolerance in plants. In this study, the role of exogenously applied plant growth regulator, gibberellic acid (GA(3)) was examined in soil grown two carrot cultivars under four different levels of lead (0, 50, 100, and 150 mg/kg) with one level of gibberellic acid (50 ppm). Results showed that Pb stress retarded the plant growth and reduced chlorophyll contents in the leaves of both carrot cultivars. A significant decrease was observed in photosynthetic attributes by Pb addition alone. However, exogenously applied GA(3) ameliorated the plant growth and chlorophyll contents in the leaves of both carrot cultivars under Pb stressed conditions. Moreover, GA(3) also decreased the uptake of Pb concentration in carrot leaves and roots. In addition, GA(3) significantly regulated the phenolic compounds concentration in both carrot cultivars under Pb stress. In this study, cultivar T-29 was found to be more tolerant to Pb stress, however, cultivar Mevarick experienced higher damage regarding plant growth under Pb stress.
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