Soil compaction effects on growth and root traits of tobacco depend on light, water regime and mechanical stress
Soil compaction effects on growth and root traits of tobacco depend on light, water regime and mechanical stress
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DOI：
10.1016/j.still.2011.11.013
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发表时间：
2012-04-01
影响因子：
6.5
通讯作者：
Villar, Rafael
中科院分区：
文献类型：
--
作者：
Alameda, David;Anten, Niels P. R.;Villar, Rafael
土壤紧实度和其他胁迫因素一样，对植物生长有重要影响.在自然界中，可以发现许多不同应力因素的组合，我们预计，土壤压实的影响可能会有所不同，这取决于其他应力的出现。这还没有得到充分的研究：大多数研究只包括一个应力因素与土壤压实。在这项研究中，我们将联合收割机土壤压实与遮荫、低水分有效性和机械应力的相互作用结合起来。以烟草（Nicotiana tabacum）为模型植物，在温室试验中研究了这些因素组合对烟草生长、生物量分配、根系形态和解剖的影响。土壤紧实度对植物生长和根系性状的影响与其他因子密切相关。在非胁迫条件下，植物生长增加压实高达1.4克cm（-3）的体积密度，然后下降。然而，在低水分和机械应力下，植物生长单调下降与压实，而在阴影下，土壤压实对生长没有影响。除遮荫处理外，土壤紧实处理均降低了细根比例，而仅在机械胁迫下增加了根径和木质部面积。这些结果表明，土壤压实对植物性能的影响分析应考虑其他应力因素的水平。更一般地说，它们说明了解释给定胁迫因子对植物的影响的困难，因为这些影响往往与其他胁迫因子的存在相互作用。(C)2011爱思唯尔有限公司版权所有。
Soil compaction can strongly affect plant performance as many other stress factors. In nature, many combinations of different stress factors may be found. We expect that the effects of soil compaction may be different depending of the occurrence of other stress. This has not been fully investigated: most studies have included only one stress factor together with soil compaction. In this study, we combine soil compaction with the interaction of shade, low water availability and mechanical stress. We use as a model system tobacco plants (Nicotiana tabacum), in which the effects of the combination of these factors in a greenhouse experiment were studied on their growth, biomass allocation, root morphology and anatomy. Soil compaction effects on growth and root traits depended strongly on the other factors. In unstressed conditions, plant growth increased with compaction up to 1.4 g cm(-3) bulk density and then declined. However, at low water and under mechanical stress plant growth declined monotonically with compaction, while under shade, soil compaction had no effect on growth. Soil compaction reduced fine root proportion in all treatments except in shade condition, while it increased root diameter and xylem area only under mechanical stress. These results indicate that analyses of soil compaction effects on plant performance should take the levels of other stress factors into account. More generally, they illustrate the difficulty of interpreting effects of a given stress factor on plants as these effects tend to interact with presence of other stressors. (C) 2011 Elsevier B.V. All rights reserved.