Impacts of NaCl stress on plant growth and mineral nutrient assimilation in two cultivars of strawberry
Impacts of NaCl stress on plant growth and mineral nutrient assimilation in two cultivars of strawberry
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DOI：
10.1016/j.envexpbot.2008.08.002
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发表时间：
2009-03-01
影响因子：
5.7
通讯作者：
Pawelzik, Elke
中科院分区：
文献类型：
--
作者：
Keutgen, Anna J.;Pawelzik, Elke
两个草莓（Fragaria x ananassa Duch.）cvs Korona和Elsanta对氯化钠盐的耐受性不同，在2002年和2003年的生长季节分别暴露于40和80 mmol NaCl L-1中4个月以上。然而，渗透势，即根培养基的NaCl浓度，在实验期间变化，因为Hoagland溶液和软化水通常每周添加一次，一方面是为了促进NaCl吸收，另一方面是为了允许在施用软化水后沥滤土壤。对土壤的沥滤应能迅速改善植物的水分关系，但不会影响植物体内的盐分水平。选择这种策略是为了减少水分胁迫的影响，并专注于NaCl胁迫的盐特异性影响。盐胁迫降低了全株干、鲜物质含量和光合有效叶面积，尤以黄瓜为甚。埃尔桑塔两个品种均表现出典型的Na、Cl胁迫症状，两种有毒离子的联合作用导致了叶片的焦枯症状。两个品种对Na的吸收相似，但Na在植株体内的分配不同。在NaCl胁迫下，Korona能显著提高叶片和冠层中的K含量，Elsanta能显著提高果实和叶柄中的K含量。钾的积累下评价NaCl水平表明，在草莓植株有效的钾吸收系统。钙的浓度没有受到显着影响，除了在根Elsanta植物的水平上升。Mg、Mn、Fe在叶片中含量显著降低，而在冠部含量显著升高。叶片、叶柄和根中的氮含量增加。此外，它上升的果实和冠在cv。埃尔桑塔一个显着的限制氮吸收的竞争与氯没有发生在这些植物。两个品种的根和叶柄中的P浓度增加，品种的果实中的P浓度增加。埃尔桑塔相对于锌和铜，不能检测到显着的浓度变化相关的NaCl胁迫。(C)2008 Elsevier B. V.保留所有权利。
Two strawberry (Fragaria x ananassa Duch.) cvs Korona and Elsanta differing in their tolerance to NaCl salinity were exposed to 40 and 80 mmol NaCl L-1 for over 4 months in the growing seasons of 2002 and 2003, respectively. However, the osmotic potential, i.e. the NaCl concentration of the root medium, varied during the experiments, because Hoagland solution and demineralized water were added usually once a week in order to push NaCl uptake on the one hand, but to allow leaching the soil after application of demineralized water on the other. Leaching the soil should quickly improve the water relations of the plant, but not affect salt levels within the plant. This strategy was chosen to reduce the effects of water stress and to focus onto the salt-specific impacts of NaCl stress. The salt stress reduced fresh and dry matter of the whole plants and photosynthetically active leaf area, especially in cv. Elsanta. Typical leaf symptoms of Na and Cl stress were detected in both cvs and the combined effects of both toxic ions resulted in the leaf scorching symptoms. Na uptake of both cvs was similar, but distribution of Na within plants was different. Korona was able to protect leaves more efficiently from Na accumulation.Under NaCl stress Korona plants achieved a significant increase of K content in leaves and crowns, while Elsanta showed an increase of K in fruits and petioles. The accumulation of K under evaluated NaCl levels suggests an efficient K uptake system in strawberry plants. Concentrations of Ca were not significantly affected, with the exception of rising levels in roots of Elsanta plants. Concentrations of Mg, Mn and Fe significantly decreased in leaves, while those of Mg and Mn remarkably rose in crowns of both cvs. N content in leaves, petioles, and roots of both cvs increased. In addition it rose in fruits and crowns in cv. Elsanta. A significant limitation of N uptake by competition with Cl did not occur in these plants. Concentrations of P increased in roots and petioles of both cvs, and in fruits of cv. Elsanta. With respect to Zn and Cu, significant concentration changes related to NaCl stress could not be detected. (C) 2008 Elsevier B.V. All rights reserved.