在Cd压力下培养的Sesuvium portulacastrum的生理和细胞超结构反应
Mohammad Mazbah Uddin1,2, Zhenfang Chen2, Fuliu Xu1
1Key Laboratory of the Ministry of Education for Earth Surface Processes, College of Urban & Environmental Sciences, Peking University, Beijing 100871, China.
Plants (Basel, Switzerland)
|October 14, 2023
概括
葡萄 (Sesuvium portulacastrum) 通过改变抗氧化酶活性和细胞结构,表现出对 (Cd) 的耐受性. 在较低的Cd度下,超氧化脱酶 (SOD) 是关键的,而过氧化酶 (POD) 在较高度下占主导地位.
科学领域:
- 环境科学 环境科学
- 植物生理学 植物生理学
- 生物化学 生物化学
背景情况:
- 重金属污染对植物和生态系统健康构成重大威胁.
- 了解植物对重金属的反应对于开发植物修复策略至关重要.
- 葡萄 (Sesuvium portulacastrum) 是一种具有金属耐受性潜力的植物.
研究的目的:
- 在 (Cd) 压力下研究Sesuvium portulacastrum的生理和细胞机制.
- 评估植物在金属污染环境中的耐受性和适应策略.
- 为了确定参与Cd排毒的占主导地位的抗氧化酶.
主要方法:
- 在28天内,S. portulacastrum的水培培养暴露在不同Cd度 (50600μM) 中.
- 生理学参数分析:叶绿素含量.
- 生物化学测定抗氧化酶活动 (catalase,超氧化物脱氧化酶,过氧化酶) 和细胞超结构的检查.
主要成果:
- 在较高Cd度 (400600μM) 的情况下,叶绿素含量显著下降.
- 超氧化脱酶 (SOD) 活性在低Cd水平 (50100μM) 上增加,然后下降,而过氧化酶 (POD) 活性随着Cd度的上升而持续增加.
- 应激诱导细胞损伤,包括扭曲的细胞壁和变形的细胞器,但增加的核表明维持了蛋白质合成.
结论:
- 葡萄 (Sesuvium portulacastrum) 使用独特的抗氧化剂防御机制来抵御的毒性.
- 在低Cd应激 (<100μM) 时,SOD是主要的酶,而POD在更高度 (>100μM) 时成为主要的酶.
- 细胞适应,包括蛋白质合成的潜在维持,有助于植物的整体耐受性.
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