Plastic plants and patchy soils
Plastic plants and patchy soils
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DOI：
10.1093/jxb/eri280
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发表时间：
2006-01-01
影响因子：
6.9
通讯作者：
Hodge, A
中科院分区：
文献类型：
--
作者：
Hodge, A
土壤养分以不均匀或“斑块”的方式分布。众所周知，根系的模块化性质使它们在遇到营养丰富的斑块时表现出形态和/或生理可塑性。这些可塑性反应被广泛认为是植物的觅食机制，以增强营养资源的捕获。虽然形态可塑性传统上被认为是更昂贵的选择，因为它需要新的根建设，最近的证据表明，这可能不一定是这样的。此外，植物可能能够重新获得新根构建所涉及的大部分初始支出，再次降低植物的总成本。在自然条件下，大多数植物的根系都有一种额外的养分获取机制，即菌根共生。然而，这些重要的共生协会后，寄主植物的营养补丁的反应的影响得到了相对较少的关注。从理论上讲，菌根真菌共生体应该能够更好地与斑块中的其他微生物群落直接竞争营养。这可能对宿主植物很重要，因为一般来说，根增殖反应对种间植物比植物-微生物竞争更重要。
Soil nutrients are distributed in a non-uniform or 'patchy' manner. It is well established that the modular nature of root systems allows them to show both morphological and/or physiological plasticity upon encountering nutrient-rich patches. These plastic responses are widely believed to be foraging mechanisms by the plant to enhance nutrient resource capture. Although morphological plasticity has traditionally been viewed as the more expensive option as it requires new root construction, more recent evidence suggests this may not necessarily be the case. Moreover, plants may be able to recapture most of the initial outlay involved in new root construction, again lowering the overall cost to the plant. Under natural conditions the roots of most plant species have an additional nutrient acquisition mechanism namely mycorrhizal symbiosis. However, the impact of these important symbiotic associations upon the host plant's response to nutrient patches has received relatively little attention. The mycorrhizal fungal symbiont should, in theory, be better able to compete directly with the rest of the microbial community for the nutrients in the patch. This could potentially be important to the host plant, as generally, root proliferation responses are more important for interspecific plant, than plant-microbial, competition.