Hai-Ming Zhao,Huan Du,Lei Xiang,Yan-Wen Li,Hui Li,Quan-Ying Cai,Ce-Hui Mo,Gang Cao,Ming-Hung Wong
To increase understanding on the mechanisms of cultivar difference in contaminant accumulation in crops, this study was designed to compare the physiological responses to di- n -butyl phthalate (DBP) exposure between low ( Lvbao70 ) and high ( Huaguan ) DBP cultivars of Chinese flowering cabbage ( Brassica parachinensis L.). Under high DBP exposure, significant differences in various physiological responses were observed between the two cultivars, which might account for the variation in DBP accumulation. Ultrastructure observation also showed different alterations or damages in the mesophyll cell structures between both cultivars, especially for the chloroplast disintegration, starch grain quantity, and plastoglobuli accumulation. Compared with Huaguan , Lvbao70 suffered greater decreases in biomass, chlorophyll content, carbon assimilation, gas exchange parameters, photosynthetic electron transport capacity, and antioxidase activities, which would have resulted in a great reduction of photosynthetic capacity. Although Lvbao70 enhanced energy dissipation and activities of some antioxidant enzymes, they did not provide sufficient protection against oxidative damage caused by DBP. The result suggested that the lower DBP tolerance of Lvbao70 might be associated with its poor physiological performances, which was responsible for its lower DBP accumulation to protect itself from toxicity. Additionally, Lvbao70 had a significantly lower transpiration rate and stomatal conductance than Huaguan , which might be the factors regulating DBP-accumulation variation.
Xue Chi,Xiaokang Li,Xuan Hou,Shuqing Guo,Xiangang Hu
Salty soil is a global problem that has adverse effects on plants. We demonstrate that bioself-assembled molybdenum–sulfur (Mo–S) crystals formed by the foliar application of MoCl5 and cysteine augment the photosynthesis of plants treated with 200 mM salt for 7 days by promoting Ca2+ signal transduction and free radical scavenging. Reductions in glutathione and phytochelatins were attributed to the biosynthesized Mo–S crystals. Plants embedded with the Mo–S crystals and exposed to salty soil exhibited carbon assimilation rates, photosynthesis rates (Fv/Fm), and electron transport rates (ETRs) that were increased by 40%, 63–173%, and 50–78%, respectively, compared with those of plants without Mo–S crystals. Increased compatible osmolyte levels and decreased levels of oxidative damage, stomatal conductance (0.63–0.42 mmol m2 s–1), and transpiration (22.9–15.3 mmol m2 s–1), free radical scavenging, and calcium-dependent protein kinase, and Ca2+ signaling pathway activation were evidenced by transcriptomics and metabolomics. The bioself-assembled crystals originating from ions provide a method for protecting plant development under adverse conditions.
危险品化学品经营许可证（带存储）