A pot experiment was conducted to study the selenium (Se) accumulation characteristics and the tolerance of Cyphomandra betacea (Solanum betaceum) seedlings under different soil Se concentrations. The 5 mg/kg soil Se concentration increased the C. betacea seedling biomass and photosynthetic pigment contents (chlorophyll a, chlorophyll b, total chlorophyll, and carotenoid), whereas the other soil Se concentrations (10, 25, and 50 mg/kg) inhibited seedling growth. Increases in the soil Se concentrations tended to decrease the superoxide dismutase activity and soluble protein content, but had the opposite effect on the peroxidase and catalase activities. The 5, 10, and 25 mg/kg soil Se concentrations decreased the DNA methylation levels of C. betacea seedlings because of an increase in demethylation patterns (versus 0 mg/kg), whereas the 50 mg/kg soil Se concentration increased the DNA methylation levels because of an increase in hypermethylation patterns (versus 0 mg/kg). Increases in the soil Se concentrations were accompanied by an increasing trend in the Se content of C. betacea seedlings. Moreover, the amount of Se extracted by the shoots was highest for the 25 mg/kg soil Se concentration. Therefore, C. betacea may be able to accumulate relatively large amounts of Se and its growth may be promoted in 5 mg/kg soil Se.

中文翻译：

---

莎草（Cyphomandra betacea）（Solanum betaceum）幼苗的硒积累特征。

盆栽试验研究了硒在不同土壤硒浓度下的富集特征及对番茄草（Cyphomandra betacea）幼苗的耐受性。5 mg / kg的土壤硒浓度增加了甜菜beta幼苗的生物量和光合色素含量（叶绿素a，叶绿素b）。，总叶绿素和类胡萝卜素），而其他土壤硒浓度（10、25和50 mg / kg）抑制幼苗生长。土壤硒浓度的增加往往会降低超氧化物歧化酶的活性和可溶性蛋白质的含量，但对过氧化物酶和过氧化氢酶的活性产生相反的影响。5、10和25 mg / kg的土壤Se浓度会降低脱甲基梭菌幼苗的DNA甲基化水平，因为去甲基化模式增加（相对于0 mg / kg），而50 mg / kg的土壤Se浓度则增加了DNA甲基化水平的增加是由于高甲基化模式的增加（相对于0 mg / kg）。土壤硒浓度的增加伴随着甜菜梭菌硒含量的增加趋势幼苗。此外，对于25 mg / kg的土壤Se浓度，新梢提取的Se量最高。因此，锥虫梭菌可能能够积累相对大量的硒，并在5 mg / kg的土壤硒中促进其生长。