Arbuscular mycorrhizal symbiosis influences strigolactone production under salinity and alleviates salt stress in lettuce plants
Arbuscular mycorrhizal symbiosis influences strigolactone production under salinity and alleviates salt stress in lettuce plants
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DOI：
10.1016/j.jplph.2012.08.020
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发表时间：
2013-01-01
影响因子：
4.3
通讯作者：
Antonio Lopez-Raez, Juan
中科院分区：
文献类型：
--
作者：
Aroca, Ricardo;Manuel Ruiz-Lozano, Juan;Antonio Lopez-Raez, Juan
丛枝菌根（AM）共生可以缓解植物的盐胁迫。然而，所涉及的密切机制以及盐度对与宿主植物-AM真菌相互作用相关的信号分子产生的影响仍然很大程度上未知。在目前的工作中，我们研究了盐度对生菜植株生长性能和独脚金内酯生产的影响，并评估了其对菌根根定植的影响。将三种不同的盐浓度应用于菌根和非菌根植物，并分析它们的长期影响。对植物生物量、气孔导度、光系统 II 效率以及 ABA 含量和独脚金内酯产量进行了评估。还分析了 ABA 生物合成基因的表达。 自植物定植的早期阶段（3 周）起，AM 植物在盐胁迫下就表现出比非菌根植物更高的生长速率和更好的生理参数性能，例如气孔导度和光系统 II 效率。此外，这些植物的 ABA 水平较低，表明它们比非定殖植物承受的压力更小。另一方面，我们发现 AM 共生和盐度都会影响独脚金内酯的产生，尽管在 AM 和非 AM 植物中影响方式不同。结果表明，AM 共生通过改变激素来缓解盐胁迫。概况并影响寄主植物的植物生理学。此外，还显示了独脚金内酯产量、ABA 含量、AM 根定殖和盐度水平之间的相关性。我们在此提出，在这些不利条件下，植物增加独脚金内酯的产量，以促进共生建立以应对盐胁迫。 (c) 2012 年爱思唯尔有限公司。版权所有。
Arbuscular mycorrhizal (AM) symbiosis can alleviate salt stress in plants. However the intimate mechanisms involved, as well as the effect of salinity on the production of signalling molecules associated to the host plant-AM fungus interaction remains largely unknown. In the present work, we have investigated the effects of salinity on lettuce plant performance and production of strigolactones, and assessed its influence on mycorrhizal root colonization. Three different salt concentrations were applied to mycorrhizal and non-mycorrhizal plants, and their effects, overtime, analyzed. Plant biomass, stomatal conductance, efficiency of photosystem II, as well as ABA content and strigolactone production were assessed. The expression of ABA biosynthesis genes was also analyzed.AM plants showed improved growth rates and a better performance of physiological parameters such as stomatal conductance and efficiency of photosystem II than non-mycorrhizal plants under salt stress since very early stages - 3 weeks - of plant colonization. Moreover, ABA levels were lower in those plants, suggesting that they were less stressed than non-colonized plants. On the other hand, we show that both AM symbiosis and salinity influence strigolactone production, although in a different way in AM and non-AM plants. The results suggest that AM symbiosis alleviates salt stress by altering the hormonal. profiles and affecting plant physiology in the host plant. Moreover, a correlation between strigolactone production, ABA content, AM root colonization and salinity level is shown. We propose here that under these unfavourable conditions, plants increase strigolactone production in order to promote symbiosis establishment to cope with salt stress. (c) 2012 Elsevier GmbH. All rights reserved.