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首页> 外文期刊>Journal of Experimental Botany >Wheat (Triticum aestivum) NAM proteins regulate the translocation of iron, zinc, and nitrogen compounds from vegetative tissues to grain.
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Wheat (Triticum aestivum) NAM proteins regulate the translocation of iron, zinc, and nitrogen compounds from vegetative tissues to grain.

机译：小麦（Triticum aestivum）NAM蛋白调节铁，锌和氮化合物从营养组织到谷物的转运。

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摘要

The NAM-B1 gene is a NAC transcription factor that affects grain nutrient concentrations in wheat (Triticum aestivum). An RNAi line with reduced expression of NAM genes has lower grain protein, iron (Fe), and zinc (Zn) concentrations. To determine whether decreased remobilization, lower plant uptake, or decreased partitioning to grain are responsible for this phenotype, mineral dynamics were quantified in wheat tissues throughout grain development. Control and RNAi wheat were grown in potting mix and hydroponics. Mineral (Ca, Cu, Fe, K, Mg, Mn, P, S, and Zn) and nitrogen (N) contents of organs were determined at regular intervals to quantify the net remobilization from vegetative tissues and the accumulation of nutrients in grain. Total nutrient accumulation was similar between lines, but grain Fe, Zn, and N were at lower concentrations in the NAM knockdown line. In potting mix, net remobilization of N, Fe, and Zn from vegetative tissues was impaired in the RNAi line. In hydroponics with ample nutrients, net remobilization was not observed, but grain Fe and Zn contents and concentrations remained lower in the RNAi line. When Fe or Zn was withheld post-anthesis, both lines demonstrated remobilization. These results suggest that a major effect of the NAM genes is an increased efflux of nutrients from the vegetative tissues and a higher partitioning of nutrients to grain.
机译：NAM-B1基因是一个NAC转录因子，可影响小麦（Triticum aestivum）的谷物营养素浓度。 NAM基因表达降低的RNAi品系具有较低的谷物蛋白，铁（Fe）和锌（Zn）浓度。为了确定减少的迁移，降低的植物吸收或减少的向谷物分配是造成这种表型的原因，在整个谷物发育过程中，对小麦组织中的矿物质动力学进行了定量。对照和RNAi小麦在盆栽混合物和水培法中生长。定期确定器官中的矿物质（钙，铜，铁，钾，镁，锰，磷，硫和锌）和氮（N）的含量，以定量从营养组织的净迁移和营养物质在谷物中的积累。品系之间的总养分积累相似，但NAM敲除品系中的铁，锌和氮含量较低。在盆栽混合物中，RNAi系中营养植物中N，Fe和Zn的净迁移受到损害。在营养充足的水培法中，未观察到净动员，但RNAi系中的谷物铁和锌含量和浓度仍然较低。当花后不施用铁或锌时，两条线都显示出了迁移。这些结果表明，NAM基因的主要作用是营养物质从营养组织中流出的增加以及营养物质向谷物的分配更高。

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