Effects of copper on growth, radial oxygen loss and root permeability of seedlings of the mangroves Bruguiera gymnorrhiza and Rhizophora stylosa
Effects of copper on growth, radial oxygen loss and root permeability of seedlings of the mangroves Bruguiera gymnorrhiza and Rhizophora stylosa
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铜对红树木榄和红树幼苗生长、径向氧损失和根系通透性的影响
DOI：
10.1007/s11104-012-1171-1
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发表时间：
2012-03
期刊：
影响因子：
4.9
通讯作者：
Ye, Zhihong
中科院分区：
文献类型：
--
作者：
Cheng, Hao;Tam, Nora Fung-Yee;Wang, Youshao;Li, Shiyu;Chen, Guizhu;Ye, Zhihong
目的红树林湿地已经历了显着的污染物输入，如铜（Cu），加剧了快速的城市发展。本研究旨在探讨根透性在重金属解毒中的可能作用。方法采用盆栽试验研究了两种红树植物幼苗根透性对重金属（Cu）暴露的响应：结果铜显著抑制木榄和红海榄的生长和根系透性（由于根孔隙度的降低、外皮层的增厚和木质化的增加），导致径向氧损失（ROL）的显著降低。土壤Cu含量与根际可溶性固形物含量呈负相关。所观察到的金属吸收切下的根进一步表明，增加木质化将直接防止过量的铜进一步进入rootsConclusionsIn总结，两个红树林反应铜根中产生一个不可渗透的屏障。这样一个可诱导的障碍，ROL可能是一种适应性的策略，对铜毒性。本研究揭示了红树林植物对重金属耐性的结构适应策略的新证据。
PurposeMangrove wetlands have experienced significant contaminant input such as copper (Cu), aggravated by rapid urban development. This study aimed to investigate the possible function of root permeability in metal detoxification.MethodsPot trials were conducted to evaluate the responses of root permeability in relation to metal (Cu) exposure in seedlings of two mangroves: Bruguiera gymnorrhiza and Rhizophora stylosa.ResultsCopper inhibited plant growth and root permeability of the two species significantly (due to decreases in root porosity, thickening of exodermis and increases in lignification), leading to a significant reduction in radial oxygen loss (ROL). A negative correlation between soil Cu and ROL from root tip was also observed. The observed metal uptake by excised roots further indicated that increased lignification would directly prevent excessive Cu from further entering into the roots.ConclusionsIn summary, the two mangroves reacted to Cu by producing an impermeable barrier in roots. Such an inducible barrier to ROL is likely to be an adaptive strategy against Cu toxicity. This study reveals new evidence of a structural adaptive strategy for metal tolerance by mangrove plants.
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影响因子：
5.7
作者：
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影响因子：
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作者：
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通讯作者：
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