Liu Lingling, Qin Shijie, Richard Whalley W, Zhou Hu, Ren Tusheng, Gao Weida
College of Land Science and Technology, China Agricultural University, Beijing, China.
Rothamsted Research, Harpenden, UK.
Plant Cell Environ. 2024 Aug;47(8):2911-2922. doi: 10.1111/pce.14915. Epub 2024 Apr 16.
Pores and old root-channels are preferentially used by roots to allow them to penetrate hard soils. However, there are few studies that have accounted for the effects of pore-rhizosheath on root growth. In this study, we developed an approach by adding the synthetic root exudates using a porous stainless tube with 0.1-mm micropores through a peristaltic pump to reproduce the rhizosheath around the artificial pore, and investigated the effects of pores with and without rhizosheaths on maize root growth in a dense soil. The results indicated that the artificial rhizosheath was about 2.69 mm wide in the region surrounding the pores. The rhizosheath had a higher content of organic carbon, total nitrogen, and abundance of Actinobacteria than that of the bulk soil. Compared with the artificial macropores, the artificial root-pores with a rhizosheath increased the opportunities for root utilisation of the pores space, promoting steeper and deeper root growth. It is concluded that the pore-rhizosheath has a significant impact on root architecture by enhancing root distribution in macropores.
根系优先利用孔隙和老根通道以便穿透坚硬土壤。然而，很少有研究考虑孔隙根际鞘对根系生长的影响。在本研究中，我们开发了一种方法，通过蠕动泵利用带有0.1毫米微孔的多孔不锈钢管添加合成根系分泌物，以在人工孔隙周围重现根际鞘，并研究有无根际鞘的孔隙对密实土壤中玉米根系生长的影响。结果表明，人工根际鞘在孔隙周围区域宽约2.69毫米。根际鞘的有机碳、总氮含量以及放线菌丰度均高于原状土壤。与人工大孔隙相比，带有根际鞘的人工根孔隙增加了根系利用孔隙空间的机会，促进根系更陡更深地生长。得出的结论是，孔隙根际鞘通过增强根系在大孔隙中的分布对根系构型有显著影响。
