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Potassium and Calcium Isotopic Fractionation by Plants (Soybean [Glycine max], Rice [Oryza sativa], and Wheat [Triticum aestivum])
ACS Earth and Space Chemistry ( IF 2.9 ) Pub Date : 2018-06-13 00:00:00 , DOI: 10.1021/acsearthspacechem.8b00035
John N. Christensen 1 , Liping Qin 2 , Shaun T. Brown 1 , Donald J. DePaolo 1, 3
Affiliation  

We conducted hydroponic experiments growing soybean (Glycine max), rice (Oryza sativa), and wheat (Triticum aestivum) under K and Ca replete conditions to establish the degree of K isotopic fractionation by plants, and compare the isotopic fractionation of Ca and K. Each of the test plants displays fractionation relative to the growth solution favoring the light isotopes of K and Ca. The average δ41K values of the roots from the three plant species were similar, and have an overall average of −0.55 ± 0.24‰ 2s, while the overall average δ44Ca for roots is −0.67 ± 0.44. For leaves, the overall average of δ41K is −0.97 ± 0.4‰, compared to an overall average leaf δ44Ca of −0.83 ± 0.09‰. In the case of the soybean plants, the lightest K and Ca occurs in the stems with average δ41K of −1.31 ± 0.40‰ 2s and average δ44Ca of −1.20 ± 0.19 ‰ 2s. We present a simple box model involving the relative fluxes of K and its isotopic fractionation that reproduces our K isotopic observations and suggests a fractionation of ∼0.8‰ with K uptake from solution by roots. Directly comparing the per amu fractionation of K and Ca reveals an average factor of 2.05 ± 0.50 2s greater fractionation of K isotopes which may reflect their different roles and behaviors in plants.

中文翻译:

植物钾和钙的同位素分馏(大豆[ Glycine max ],水稻[ Oryza sativa ]和小麦[ Triticum aestivum ])

我们进行了在K和Ca充足的条件下种植大豆(Glycine max),水稻(Oryza sativa)和小麦(Triticum aestivum)的水培实验,以确定植物的K同位素分馏程度,并比较Ca和K的同位素分馏。每种测试植物均显示出相对于生长溶液的分馏,有利于钾和钙的轻同位素。平均δ 41从三种植物根的的K值是相似的,并且具有-0.55±0.24‰2S的整体平均,而整体平均δ 44钙对根是-0.67±0.44。对于叶,δ的总平均41 K是-0.97±0.4‰,相比总体平均叶δ 44Ca为-0.83±0.09‰。在大豆植物的情况下,最轻的钾和钙发生在与平均δ茎41的-1.31±0.40‰2S K和平均δ 44的-1.20±0.19‰2S钙。我们提出了一个简单的盒模型,该模型涉及K的相对通量及其同位素分馏,该模型重现了我们的K同位素观测结果,并提出了约0.8‰的分馏,其中钾从根部吸收。直接比较K和Ca的每amu分馏率,发现K同位素的平均分馏率提高了2.05±0.50 2s,这可能反映了它们在植物中的不同作用和行为。
更新日期:2018-06-13
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