【摘要】 为探究不同化学生态型紫苏的镉耐性与镉富集能力差异,设置不同浓度镉处理,测定了4种化学生态型紫苏种子的萌发指标及其幼苗的镉含量与镉富集特性。结果显示,10.0 mg·L^-1镉处理对PKPA型、EK型和PK-I型紫苏种子的发芽率、发芽势无显著影响,但显著抑制了PK-Ⅱ型紫苏种子的萌发。不同浓度镉处理下,不同生态型紫苏各部位的镉含量均表现为:根(1 052.0～5 337.1 mg·kg^-1)>茎(327.6～807.9 mg·kg^-1)>叶(104.8～343.3 mg·kg^-1),全株镉含量在348.1～1 416.73 mg·kg^-1,远高于镉超富集植物的标准(100 mg·kg^-1)。不同生态型紫苏的镉富集系数（BCF）存在显著差异,PAPK型、PK-Ⅱ型、EK型紫苏的BCF在2.0 mg·L^-1镉处理时最高,依次为252.0、300.5、295.3,显著高于PK-Ⅰ型,后者的BCF在5.0 mg·L^-1镉处理时最高（265.5）,显著高于PAPK型、PK-Ⅱ型和EK型。不同生态型紫苏的镉富集量均以5.0 mg·L^-1镉处理时最高,PK-Ⅰ型紫苏镉总富集量为454.0μg·株^-1,分别是PAPK型、PK-Ⅱ型和EK型的2.48、1.69倍和2.05倍。不同化学生态型紫苏的镉耐性间存在显著差异,镉胁迫下PK-Ⅰ型紫苏具有较高镉耐性及镉富集能力,可用于后续研究紫苏镉耐性作用机制以及镉污染稻田修复的主要种质资源。更多还原

【Abstract】 This study explored differences in the cadmium tolerance and accumulation capacity of various chemical ecological types of Perilla frutescens. In this context, P. frutescens was treated with different cadmium concentrations and the germination indices of four chemical ecological types of P. frutescens seeds were determined. The cadmium content and cadmium enrichment characteristics of the subsequent seedlings were quantified. The results showed that the germination rate and potential of PKPA, EK, and PK-Ⅰ P. frutescens seeds were not significantly affected by a 10.0 mg·L^-1 cadmium treatment, whereas this treatment significantly inhibited the germination of PK-Ⅱ P. frutescens seeds. Under different cadmium concentrations, the cadmium content in each part of different ecotypes of P. frutescens in descending order was:root(1 052.0～5 337.1 mg·kg^-1)> stem(327.6～807.9 mg·kg^-1)> leaf(104.8～343.3 mg·kg^-1). The cadmium content of the entire plant was between 348.1～1 416.73 mg·kg^-1, which is higher than standard cadmium hyperaccumulators(100 mg·kg^-1). There were significant differences in the cadmium enrichment coefficient（BCF）of different P. frutescens ecotypes. The BCF ranged between 127.9 and 300.5, and the BCF of PAPK, PK-Ⅱ, and EK P. frutescens were 252.0, 300.5, and 295.3, respectively, which were significantly higher than PK-Ⅰ when treated with 2.0 mg·L^-1 cadmium. The BCF of PK-I was highest（265.5）when treated with 5.0 mg·L^-1 cadmium, which was significantly higher than PAPK, PK-Ⅱ, and EK. The cadmium enrichment of different ecological P. frutescens was the highest with a 5.0 mg·L^-1 cadmium treatment. The total cadmium enrichment of the PK-Ⅰ P. frutescens was 454.0 μg·plant^-1, which was 2.48, 1.69 and 2.05 times higher than that of PAPK, PK-Ⅱ, and EK P. frutescens types, respectively. Studies have shown that there are significant differences in the cadmium tolerance of different chemical ecotypes of PK-Ⅰ P. frutescens under cadmium stress. P. frutescens has high cadmium tolerance and enrichment ability, with great potential for cadmium pollution eradication; thus, it may be used for future research on cadmium tolerance in P. frutescens.更多还原