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Root cell walls constrain the development of lateral root primordia into lateral roots.

机译：根细胞壁将侧根原基发育成侧根。

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摘要

Plants adapt to their unique soil environments by altering the number of lateral roots postembryonically. Arabidopsis seedlings grown on media respond to changes in osmotic potential and sucrose availability by simultaneously altering lateral root formation and shoot size. However, lateral root formation is repressed independently of shoot size with increased environmental nitrate concentration. Novel mutants have previously been identified that exhibit increased lateral root formation on screening conditions containing high amounts of nitrate salts. Eight mutants have been 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 to alter a gene recently characterized to be involved in cell-wall biosynthesis. Mutations in this gene result in a reduction in the frequency in which lateral root primordia emerge to form lateral roots. However, the number of initiated primordia in this mutant is unaltered. Screening of other previously characterized cell wall mutants revealed that many also exhibit altered lateral root formation. This work suggests that proper cell wall biosynthesis is required for the normal process of lateral root emergence in Arabidopsis grown on media.
机译：植物通过胚后改变侧根的数量来适应其独特的土壤环境。在培养基上生长的拟南芥幼苗通过同时改变侧根的形成和枝条的大小来响应渗透势和蔗糖的利用率。然而，随着环境硝酸盐浓度的增加，侧根的形成不受芽的大小的影响。先前已经鉴定出了在含有大量硝酸盐的筛选条件下表现出增加的侧根形成的新型突变体。已对8个突变体进行了详细表征，并发现它们至少由于三种不同的机制而具有增加的侧根形成。发现这些突变体之一的因果突变会改变最近被证实参与细胞壁生物合成的基因。该基因的突变导致侧根原基出现形成侧根的频率降低。但是，该突变体中起始原基的数量没有改变。筛选其他先前表征的细胞壁突变体表明，许多突变体还显示出改变的侧根形成。这项工作表明，在培养基上生长的拟南芥中，正常的侧根出现过程需要适当的细胞壁生物合成。

著录项

  • 作者

    Roycewicz, Peter Stefan.;

  • 作者单位

    The University of Chicago.;

  • 授予单位 The University of Chicago.;
  • 学科 Biology Genetics.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 143 p.
  • 总页数 143
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 宗教;
  • 关键词

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