Luo Chunyan, Jiang Tingting, Ren Peng, Suo Zhirong, Chen Ke
School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China.
Analytical and Testing Center, Southwest University of Science and Technology, Mianyang 621010, China.
Plants (Basel). 2024 Dec 23;13(24):3598. doi: 10.3390/plants13243598.
Diesel spills and nuclides pollution cause global ecosystem and human health problems. The remediation of contaminated soil using woody plants has received considerable attention. Differences in plant species and sex can lead to differences in tolerance to various stressors. We aimed to investigate the response of male and female seedlings of and to diesel and Sr stress and to compare the enrichment characteristics of Sr in trees. Male and female seedlings of and were treated with diesel fuel and 0, 10 (low), and 100 (high) mg Kg of Sr. Results showed that and had good enrichment characteristics and tolerance. had a more robust tolerance and ability to remediate contaminated soil than . The defense mechanisms of both female seedlings in response to stress were similar, while males showed different defense strategies. Male trees had higher Sr enrichment capacity, antioxidant enzymes, soil enzyme activity, and soluble matter content, indicating that males had higher tolerance capacity than females. Under diesel stress alone, the reduced photosynthetic rate of male seedlings of was mainly limited by stomatal factors, and their photosynthetic system was more tolerant to diesel. POD and APX activities, as well as alkaline phosphatase and urease activities in the soil, were significantly higher in seedlings than in , indicating that seedlings were more resistant to diesel pollution. At low concentrations of the Sr complex, diesel and Sr showed antagonistic effects in reducing the damage caused by stress. As the Sr concentration increased, damage to the plants manifested primarily through synergistic enhancement. The results of this study provide a scientific basis for the remediation of diesel fuel and nuclides contaminated soils using woody plants.
柴油泄漏和核素污染引发了全球生态系统和人类健康问题。利用木本植物修复受污染土壤受到了广泛关注。植物物种和性别的差异会导致对各种胁迫源的耐受性不同。我们旨在研究[植物名称1]和[植物名称2]的雄性和雌性幼苗对柴油和锶胁迫的响应，并比较树木中锶的富集特征。[植物名称1]和[植物名称2]的雄性和雌性幼苗分别用柴油以及0、10（低）和100（高）毫克/千克的锶进行处理。结果表明，[植物名称1]和[植物名称2]具有良好的富集特征和耐受性。[植物名称1]比[植物名称2]具有更强的耐受性和修复污染土壤的能力。两种植物的雌性幼苗对应激的防御机制相似，而雄性则表现出不同的防御策略。雄性树木具有更高的锶富集能力、抗氧化酶、土壤酶活性和可溶性物质含量，表明雄性比雌性具有更高的耐受能力。仅在柴油胁迫下，[植物名称1]雄性幼苗光合速率的降低主要受气孔因素限制，其光合系统对柴油更具耐受性。[植物名称1]幼苗中的过氧化物酶（POD）和抗坏血酸过氧化物酶（APX）活性以及土壤中的碱性磷酸酶和脲酶活性显著高于[植物名称2]，表明[植物名称1]幼苗对柴油污染更具抗性。在低浓度的锶复合物下，柴油和锶在减轻胁迫造成的损害方面表现出拮抗作用。随着锶浓度的增加，对植物的损害主要通过协同增强表现出来。本研究结果为利用木本植物修复柴油和核素污染土壤提供了科学依据。
