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首页> 外文期刊>Journal of Experimental Botany >Phosphorus and magnesium interactively modulate the elongation and directional growth of primary roots in Arabidopsis thaliana (L.) Heynh
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Phosphorus and magnesium interactively modulate the elongation and directional growth of primary roots in Arabidopsis thaliana (L.) Heynh

机译：磷和镁相互作用地调节拟南芥（L.）Heynh中亚麻植物的伸长和定向生长

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摘要

A balanced supply of essential nutrients is an important factor influencing root architecture in many plants, yet data related to the interactive effects of two nutrients on root growth are limited. Here, we investigated the interactive effect between phosphorus (P) and magnesium (Mg) on root growth of Arabidopsis grown in pH-buffered agar medium at different P and Mg levels. The results showed that elongation and deviation of primary roots were directly correlated with the amount of P added to the medium but could be modified by the Mg level, which was related to the root meristem activity and stem-cell division. High P enhanced while low P decreased the tip-focused fluorescence signal of auxin biosynthesis, transport, and redistribution during elongation of primary roots; these effects were greater under low Mg than under high Mg. The altered root growth in response to P and Mg supply was correlated with AUX1, PIN2, and PIN3 mRNA abundance and expression and the accumulation of the protein. Application of either auxin influx inhibitor or efflux inhibitor inhibited the elongation and increased the deviation angle of primary roots, and decreased auxin level in root tips. Furthermore, the auxin-transport mutants aux1-22 and eir1-1 displayed reduced root growth and increased the deviation angle. Our data suggest a profound effect of the combined supply of P and Mg on the development of root morphology in Arabidopsis through auxin signals that modulate the elongation and directional growth of primary root and the expression of root differentiation and development genes.
机译：在许多植物中，必需营养素的平衡供应是影响根系结构的一个重要因素，但有关两种营养素对根系生长的交互作用的数据有限。在这里，我们研究了磷（P）和镁（Mg）在不同P和Mg水平下对生长在pH缓冲琼脂培养基中的拟南芥根系生长的交互作用。结果表明，初生根的伸长和偏差与培养基中磷的添加量直接相关，但可以被镁水平改变，而镁水平与根分生组织活性和干细胞分裂有关。在初生根伸长过程中，高磷增强而低磷降低了生长素生物合成、运输和再分配的尖端聚焦荧光信号；这些影响在低镁条件下比高镁条件下更大。磷和镁供应引起的根系生长变化与AUX1、PIN2和PIN3 mRNA丰度、表达和蛋白质积累有关。施用生长素内流抑制剂或外流抑制剂均能抑制初生根伸长，增加初生根偏角，降低根尖生长素水平。此外，生长素运输突变体aux1-22和eir1-1表现出根系生长减少和偏离角增加。我们的数据表明，磷和镁的联合供应通过生长素信号对拟南芥根系形态的发育产生了深远的影响，生长素信号调节初生根的伸长和定向生长以及根系分化和发育基因的表达。

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