Fungal elicitor-induced retardation and its restoration of root growth in tobacco seedlings
Fungal elicitor-induced retardation and its restoration of root growth in tobacco seedlings
复制标题
真菌诱导子诱导的烟草幼苗根系生长迟缓及其恢复
DOI：
10.1007/s10725-011-9629-3
复制
发表时间：
2012
影响因子：
4.2
通讯作者：
Suzuki K
中科院分区：
文献类型：
--
作者：
Kawaguchi Y;Nishiuchi T;Kodama H;Nakano T;Nishimura K;Shimamura K;Yamaguchi K;Kuchitsu K;Shinshi H;Suzuki K
在这项研究中，我们研究了生长中的完整烟草（N. tabacumcv Xanthi）幼苗对真菌激发子（一种来自绿色木霉（TvX）的木聚糖酶）的反应。除了诱导防御基因表达外，TvX 处理还导致幼苗生长迟缓。在TvX处理的幼苗中，通过分别抑制分生区和伸长区的细胞分裂和纵向细胞伸长，初生根的生长显着减少。然而，细胞继续分化形成维管束和根毛。在TvX处理的根冠中，观察到小柱细胞中淀粉颗粒的消失和边缘细胞的聚集。此外，去除激发子后，TvX 诱导的生长迟缓得以恢复，导致根结构发生塑性改变。因此，真菌激发子可能充当调节根生长和发育以及植物幼苗的普通防御反应的环境线索。这些发现表明通过根际植物与微生物相互作用来调节植物生长的一个新方面。
In this study, we investigated responses of growing and intact tobacco (N. tabacumcv Xanthi) seedlings to a fungal elicitor, a xylanase fromTrichoderma viride(TvX). In addition to the induction of defense gene expression, TvX treatment caused the retardation of growth of seedlings. In the TvX-treated seedlings, growth of primary roots was markedly reduced through repression of cell division and longitudinal cell elongation in a meristematic zone and an elongation zone, respectively. However, cell differentiation to form vascular bundles and root hairs continued. In the TvX-treated root cap, disappearance of starch granules in columella cells and aggregation of border cells were observed. Furthermore, the TvX-induced growth retardation was restored after removal of the elicitor, resulting in a plastic alteration of root architecture. Therefore, the fungal elicitor might act as an environmental cue that regulates root growth and development as well as the ordinary defense responses in plant seedlings. These findings suggest a novel aspect of plant growth regulation via a plant–microbe interaction in the rhizosphere.