Departamento de Microbiologia del Suelo y Sistemas Simbióticos, Estación Experimental del Zaidín (CSIC), Granada, Spain.
Planta. 2010 Jul;232(2):533-43. doi: 10.1007/s00425-010-1196-8. Epub 2010 May 25.
It is documented that some plant-growth-promoting rhizobacteria (PGPR) enhance plant salt tolerance. However, as to how PGPR may influence two crucial components of plant salt tolerance such as, root hydraulic characteristics and aquaporin regulation has been almost unexplored. Here, maize (Zea mays L.) plants were inoculated with a Bacillus megaterium strain previously isolated from a degraded soil and characterized as PGPR. Inoculated plants were found to exhibit higher root hydraulic conductance (L) values under both unstressed and salt-stressed conditions. These higher L values in inoculated plants correlated with higher plasma membrane type two (PIP2) aquaporin amount in their roots under salt-stressed conditions. Also, ZmPIP1;1 protein amount under salt-stressed conditions was higher in inoculated leaves than in non-inoculated ones. Hence, the different regulation of PIP aquaporin expression and abundance by the inoculation with the B. megaterium strain could be one of the causes of the different salt response in terms of root growth, necrotic leaf area, leaf relative water content and L by the inoculation treatment.
有文献记载，一些植物促生根际细菌（PGPR）可以增强植物的耐盐性。然而，PGPR 如何影响植物耐盐性的两个关键组成部分，即根系水力特性和水通道蛋白调节，几乎还没有被探索过。在这里，用一株先前从退化土壤中分离出来并被鉴定为 PGPR 的巨大芽孢杆菌菌株对玉米（Zea mays L.）植株进行了接种。结果发现，接种植株在无胁迫和盐胁迫条件下的根系水力传导率（L）值更高。在盐胁迫条件下，接种植株根系中质膜类型二（PIP2）水通道蛋白的数量更高，与这些更高的 L 值相关。此外，在盐胁迫条件下，接种叶片中的 ZmPIP1;1 蛋白含量高于未接种叶片。因此，接种巨大芽孢杆菌菌株对 PIP 水通道蛋白表达和丰度的不同调节，可能是接种处理在根系生长、叶片坏死面积、叶片相对含水量和 L 方面对盐响应不同的原因之一。
