Geisler M, Wang B, Zhu J
Department of Biology - Plant Biology, University of Fribourg, Fribourg, Switzerland.
Plant Biol (Stuttg). 2014 Jan;16 Suppl 1:50-7. doi: 10.1111/plb.12030. Epub 2013 May 3.
Root gravitropism is a complex, plant-specific process allowing roots to grow downward into the soil. Polar auxin transport and redistribution are essential for root gravitropism. Here we summarise our current understanding of underlying molecular mechanisms and involved transporters that establish, maintain and redirect intercellular auxin gradients as the driving force for root gravitropism. We evaluate the genetic, biochemical and cell biological approaches presently used for the analysis of auxin redistribution and the quantification of auxin fluxes. Finally, we also discuss new tools that provide a higher spatial or temporal resolution and our technical needs for future gravitropism studies.
根向地性是一个复杂的、植物特有的过程，它使根能够向下生长到土壤中。极性生长素运输和重新分布对于根向地性至关重要。在这里，我们总结了目前对潜在分子机制和相关转运蛋白的理解，这些机制和转运蛋白建立、维持并重新引导细胞间生长素梯度，作为根向地性的驱动力。我们评估了目前用于分析生长素重新分布和生长素通量定量的遗传、生化和细胞生物学方法。最后，我们还讨论了提供更高空间或时间分辨率的新工具以及我们未来向地性研究的技术需求。
