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首页> 外文期刊>Journal of Experimental Botany >Cell wall properties play an important role in the emergence of lateral root primordia from the parent root.
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Cell wall properties play an important role in the emergence of lateral root primordia from the parent root.

机译：细胞壁特性在从亲本根出现侧根原基的过程中起重要作用。

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Plants adapt to their unique soil environments by altering the number and placement of lateral roots post-embryonic. Mutants were identified in Arabidopsis thaliana that exhibit increased lateral root formation. Eight mutants were characterized in detail and were found to have increased lateral root formation due to at least three distinct mechanisms. The causal mutation in one of these mutants was found in the XEG113 gene, recently shown to be involved in plant cell wall biosynthesis. Lateral root primordia initiation is unaltered in this mutant. In contrast, synchronization of lateral root initiation demonstrated that mutation of XEG113 increases the rate at which lateral root primordia develop and emerge to form lateral roots. The effect of the XEG113 mutation was specific to the root system and had no apparent effect on shoot growth. Screening of 17 additional cell wall mutants, altering a myriad of cell wall components, revealed that many (but not all) types of cell wall defects promote lateral root formation. These results suggest that proper cell wall biosynthesis is necessary to constrain lateral root primordia emergence. While previous reports have shown that lateral root emergence is accompanied by active remodelling of cell walls overlying the primordia, this study is the first to demonstrate that alteration of the cell wall is sufficient to promote lateral root formation. Therefore, inherent cell wall properties may play a previously unappreciated role in regulation of root system architecture.
机译：植物通过改变胚后侧根的数量和位置来适应其独特的土壤环境。在拟南芥中鉴定出表现出增加的侧根形成的突变体。详细描述了八个突变体，并发现由于至少三个不同的机制，其侧根形成增加。在XEG113基因中发现了这些突变体之一的因果突变，最近发现该基因与植物细胞壁的生物合成有关。在该突变体中，侧根原基的起始未改变。相反，侧根起始的同步表明XEG113的突变增加了侧根原基发育并形成侧根的速率。 XEG113突变的影响是根系特有的，对芽的生长没有明显影响。筛选了另外17种细胞壁突变体，改变了无数的细胞壁成分，发现许多（但不是全部）细胞壁缺陷类型促进了侧根的形成。这些结果表明适当的细胞壁生物合成对于约束侧根原基的出现是必要的。虽然先前的报道表明侧根出现伴随着原基上的细胞壁的主动重塑，但这项研究首次证明了细胞壁的改变足以促进侧根的​​形成。因此，固有的细胞壁特性可能在调节根系体系结构中起着以前未曾意识到的作用。

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