Interactions among Fe2+, S2-, and Zn2+ tolerance, root anatomy, and radial oxygen loss in mangrove plants
Interactions among Fe2+, S2-, and Zn2+ tolerance, root anatomy, and radial oxygen loss in mangrove plants
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红树林植物 Fe2、S2- 和 Zn2 耐受性、根解剖结构和径向氧损失之间的相互作用
DOI：
10.1093/jxb/err440
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发表时间：
2012-04-01
影响因子：
6.9
通讯作者：
Ye, Zhi-Hong
中科院分区：
文献类型：
--
作者：
Cheng, Hao;Chen, Dan-Ting;Ye, Zhi-Hong
研究了8种红树林幼苗的根系解剖、径向氧损失（ROL）以及对Fe 2+、S 2-和Zn 2+离子的耐受性，其中包括3种先锋种、3种根茎型和2种陆向型半红树林。结果表明，该菌对Fe ~（2+）、S ~（2-）和Zn ~（2+）具有明显的共耐性。木榄、秋茄和红海榄这三种红树植物在ROL空间格局中具有最厚的木质外皮和最紧密的屏障，对Fe ~（2+）、S ~（2-）和Zn ~（2+）的耐受性最高。B。结果表明，木榄可通过增加外皮层的木质化直接降低ROL。这种对ROL的诱导屏障可能是防止毒素在植物内进一步入侵和传播的防御反应。数据还表明，在B.结果表明，Fe ~（2+）、S ~（2-）或两者均能诱导木质化外皮层，延缓Zn ~（2+）进入根内，从而提高对Zn ~（2+）的耐性。本研究为红树林幼苗根系处理污染物的排他策略提供了新的证据。这一信息对于选择和培育耐受物种以便对受污染的沃茨或土壤进行生物补救也很重要。
Root anatomy, radial oxygen loss (ROL), and tolerances to ferrous (Fe2+), sulphide (S2-), and zinc (Zn2+) ions were investigated in seedlings of eight species of mangrove, including three pioneer species, three rhizophoraceous and two landward semi-mangrove species. The results showed an interesting co-tolerance to Fe2+, S2-, and Zn2+. The three rhizophoraceous species (Bruguiera gymnorrhiza, Kandelia obovata and Rhizophora stylosa), which possessed the thickest lignified exodermis and the 'tightest barrier' in ROL spatial pattern, consistently exhibited the highest tolerance to Fe2+, S2-, and Zn2+. B. gymnorrhiza could directly reduce ROL by increasing lignification within the exodermis. Such an induced barrier to ROL is a probable defence response to prevent further invasion and spread of toxins within plants. The data also indicated that, in B. gymnorrhiza, Fe2+ or S2-, or both, induced a lignified exodermis that delayed the entry of Zn2+ into the roots and thereby contributed to a higher tolerance to Zn2+. This study provides new evidence of exclusive strategies of mangrove seedling roots in dealing with contaminations. The information is also important in the selection and cultivation of tolerant species for the bioremediation of contaminated waters or soils.