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首页> 外文期刊>Australian Journal of Crop Science >Phosphite supply affects phosphorus nutrition and biochemical responses in maize plants
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Phosphite supply affects phosphorus nutrition and biochemical responses in maize plants

机译：亚磷酸盐的供应影响玉米植物中的磷营养和生化响应

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Phosphate (Pi) is the major phosphorus (P) form used for plant nutrition, whereas phosphite (Phi) is effective in controlling important plant diseases caused by Oomycetes pathogens. However, Phi-based products also have been widely marketed as either P fertilizer or biostimulant, such as elicitor of biochemical responses to abiotic and biotic stress agents, although these effects are not as yet well understood. This investigation has aimed to evaluate the effect of Phi supply as part of the P fertilization, and its influence on the guaiacol peroxidase activity and contents of total fenolics and lignin in maize plants. This study was conducted in an experimental design completely randomized, with 2 P concentrations (52 μM = low P concentration, and 644 μM = adequate P concentration) and 2 P forms (100% phosphate, and 75/25% as Pi/Phi, respectively). Based on studies of uptake kinetics of the 31P, it was shown Phi inhibits Pi uptake competitively in maize, regardless of the plant Pi status. Replacement of 1/4 of Pi by Phi decreased the biomass production of the plants grown under low Pi supply, but no effect was observed in the plants grown under adequate Pi supply, with the advantage of eliciting biochemical responses to stress agents, such as stimulation of the guaiacol peroxidase activity and lignin biosynthesis.
机译：磷酸盐（Pi）是用于植物营养的主要磷（P）形式，而亚磷酸盐（Phi）可有效控制由卵菌病原体引起的重要植物病害。但是，基于Phi的产品也已作为P肥料或生物刺激剂广泛销售，例如引起对非生物和生物胁迫因子的生化反应的引发剂，尽管这些作用尚未得到很好的理解。这项研究旨在评估作为P施肥的一部分的Phi的供应及其对愈创木酚过氧化物酶活性以及玉米植株中总酚和木质素含量的影响。这项研究是在完全随机的实验设计中进行的，其中2 P浓度（52μM=低P浓度，644μM=足够的P浓度）和2 P形式（100％磷酸盐和75/25％的Pi / Phi，分别）。根据对31P吸收动力学的研究，结果表明，无论植物Pi处于何种状态，Phi都能竞争性地抑制玉米中Pi的吸收。用Phi替代1/4的Pi会降低低磷供应下生长的植物的生物量产量，但在充足磷供应下生长的植物中未观察到任何作用，其优点是引起对应激物（如刺激）的生化反应愈创木酚过氧化物酶活性和木质素的生物合成。

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