Ródenas Reyes, García-Legaz Manuel Francisco, López-Gómez Elvira, Martínez Vicente, Rubio Francisco, Ángeles Botella M
Departamento de Nutrición Vegetal, CEBAS-CSIC, Murcia, 30100, Spain.
Departamento de Agroquímica y Medioambiente, Universidad Miguel Hernández, Alicante, 03312, Spain.
Physiol Plant. 2017 Aug;160(4):410-424. doi: 10.1111/ppl.12558. Epub 2017 May 3.
Regulation of essential macronutrients acquisition by plants in response to their availability is a key process for plant adaptation to changing environments. Here we show in tomato and Arabidopsis plants that when they are subjected to NO , PO and SO deprivation, low-affinity K uptake and K translocation to the shoot are reduced. In parallel, these nutritional deficiencies produce reductions in the messenger levels of the genes encoding the main systems for low-affinity K uptake and K translocation, i.e. AKT1 and SKOR in Arabidopsis and LKT1 and the tomato homolog of SKOR, SlSKOR in tomato, respectively. The results suggest that the shortage of one nutrient produces a general downregulation of the acquisition of other nutrients. In the case of K nutrient, one of the mechanisms for such a response resides in the transcriptional repression of the genes encoding the systems for K uptake and translocation.
植物根据必需常量营养素的可利用性来调节其获取过程，这是植物适应不断变化的环境的关键过程。在此，我们在番茄和拟南芥植株中发现，当它们遭受氮、磷和硫缺乏时，低亲和力钾离子吸收以及钾离子向地上部的转运都会减少。与此同时，这些营养缺乏会导致编码低亲和力钾离子吸收和转运主要系统的基因信使水平降低，即在拟南芥中分别为AKT1和SKOR，在番茄中为LKT1和SKOR的番茄同源物SlSKOR。结果表明，一种养分的短缺会导致其他养分获取的普遍下调。就钾养分而言，这种反应的机制之一在于对编码钾吸收和转运系统的基因进行转录抑制。
