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High-affinity K+Uptake in Citrus

机译：高亲和力K +在柑橘中摄取

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K + is one of the most abundant mineral nutrients in plants. It fulfils important functions and its cytosolic concentration is maintained at a constant value around 100mM. This contrasts with the highly variable K + concentrations that can be found in the soil solution. Therefore, to acquire K + plant roots are furnished in K+ channels and transporters that ensure an adequate K+ nutrition under many different situations. One condition that may limit K + nutrition is salinity, a problem that affects a 30% or irrigated land. In citrus there is little information about the mechanisms involved in K+ uptake and the negative effect of salinity. For the present study two citrus rootstocks, Carrizo and Cleopatra that differ in salt tolerance were chosen. The response of these two rootstocks to different regimens of K + nutrition and the effect of salinity on such a process were studied. Plants were germinated and grown for one month under hydroponics with nutrient solutions that contained different concentrations of K+ and Na+. After the growth period, growth parameters, mineral composition and K+ influx were determined. The effect of the K+ supply and the different levels of salinity on the development of high-affinity K+ uptake were characterized. It was observed that Carrizo grew faster than Cleopatra and showed lower tissue K + concentrations, especially at low external K +. In addition, Carrizo showed higher rates of highaffinity K+ uptake. A molecular approach was undertaken to isolate and characterize genes encoding putative high-affinity K+ transporters. By RT-PCR, several cDNA fragments were isolated that encoding transporters of the KT/HAK/KUP family. The function of these putative K+ transporters as well as the regulation of the genes encoding them in relation to plant growth and high-affinity K + uptake will be discussed.
机译：K +是植物中最丰富的矿物营养素之一。它满足了重要的功能，其细胞溶质浓度保持在100mm的恒定值。这与可在土壤溶液中发现的高度可变k +浓度形成鲜明对比。因此，为了获得K +植物根部，提供K +通道和运输器，确保在许多不同情况下的足够K +营养。可能限制K +营养的一个条件是盐度，是影响30％或灌溉土地的问题。在柑橘中，几乎没有关于k +摄取和盐度的负面影响的机制的信息。对于目前的研究，选择了两个柑橘砧木，胰酸和克娄妥拉，其含盐耐受性。研究了这两个砧木对不同K +营养方案的响应以及对这种方法的盐度的影响。植物在水培中萌发并生长一个月，含有不同浓度的K +和Na +的营养溶液。测定生长期后，测定生长参数，矿物组合物和K +流入。 k +供应和不同盐度对高亲和力K +摄取的影响的影响。观察到Carrizo比克利奥多拉更快地增长，并且显示较低的组织K +浓度，特别是在低外部K +。此外，Carrizo表现出更高的高附加型K +摄取率。进行分子方法以分离和表征编码推定的高亲和力K +转运蛋白的基因。通过RT-PCR，分离几种cDNA片段，即编码Kt / Hak / kup家族的转运蛋白。将讨论这些推定的K +转运蛋白的功能以及将其与植物生长和高亲和力K +摄取的组合的基因的调节。

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