The case against (-)-catechin involvement in allelopathy of Centaurea stoebe (spotted knapweed)
The case against (-)-catechin involvement in allelopathy of Centaurea stoebe (spotted knapweed)
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DOI：
10.4161/psb.4.5.8273
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发表时间：
2009-01-01
影响因子：
2.9
通讯作者：
Blair, Amy C.
中科院分区：
文献类型：
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作者：
Duke, Stephen O.;Dayan, Franck E.;Blair, Amy C.
证明化感化学干扰是一项艰巨的任务，因为植物毒素从供体植物到受体植物的生产和移动必须在植物生长的基质中得到证明，而基质通常是复杂的土壤基质。供体产生的化合物的土壤水平或土壤通量水平必须证明足以对接收植物产生不利影响。关于(-)-儿茶素是半人马座杂草（斑叶麻菜）入侵新领土的新武器的报道，并没有得到本附录所列论文的支持，也没有得到另外两个实验室所发表论文的支持。这些论文发现(-)-儿茶素水平在土壤中生长的C. stoebe是数量级低于水平，仅引起轻微的生长影响对报告的敏感物种。此外，(-)-儿茶素通过引起氧化损伤而作为植物毒素的说法被事实所驳斥，因为这种分子是一种强抗氧化剂，可以被细胞外根酶迅速降解。
Proving allelopathic chemical interference is a daunting endeavor, in that production and movement of a phytotoxin from a donor plant to a receiving plant must be demonstrated in the substrate in which the plants grow, which is usually a complex soil matrix. The soil levels or soil flux levels of the compound generated by the donor must be proven to be sufficient to adversely affect the receiving plant. Reports of (-)-catechin to be the novel weapon used by Centaurea stoebe (spotted knap-weed) to invade new territories are not supported by the paper featured in this Addendum, nor by papers produced by two other laboratories. These papers find that (-)-catechin levels in soil in which C. stoebe grows are orders of magnitude below levels that cause only minor growth effects on reported sensitive species. Furthermore, the claim that (-)-catechin acts as a phytotoxin through causing oxidative damage is refuted by the fact that the molecule is a strong antioxidant and is quickly degraded by extracellular root enzymes.