Reduced cellulose synthesis invokes lignification and defense responses in Arabidopsis thaliana
Reduced cellulose synthesis invokes lignification and defense responses in Arabidopsis thaliana
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DOI：
10.1046/j.1365-313x.2003.01729.x
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发表时间：
2003-05-01
期刊：
影响因子：
7.2
通讯作者：
Bevan, M
中科院分区：
文献类型：
--
作者：
Caño-Delgado, A;Penfield, S;Bevan, M
细胞壁决定植物细胞的形状，也是病原体相互作用的主要界面。细胞壁的结构可以根据发育和环境线索进行修改，例如增强细胞壁并形成阻止病原体进入的屏障。异位木质素 1-1 和 1-2（eli1-1 和 eli1-2）突变导致木质素（一种复杂的苯丙素聚合物）异常沉积。我们发现，eli1 突变体出现在拟南芥纤维素合酶基因 CESA3 中，导致纤维素合成减少，为多个 CESA 亚基在纤维素合成中的功能提供了进一步的证据。我们发现，由纤维素合酶基因和影响细胞扩张的基因突变引起的纤维素合成水平降低，通过茉莉酸和乙烯以及其他信号通路激活木质素合成和防御反应。这些观察结果表明，监测细胞壁完整性的机制可以激活木质化和防御反应。
The cell wall determines the shape of plant cells and is also the primary interface for pathogen interactions. The structure of the cell wall can be modified in response to developmental and environmental cues, for example to strengthen the wall and to create barriers to pathogen ingress. The ectopic lignin 1-1 and 1-2 (eli1-1 and eli1-2) mutations lead to an aberrant deposition of lignin, a complex phenylpropanoid polymer. We show that the eli1 mutants occur in the cellulose synthase gene CESA3 in Arabidopsis thaliana and cause reduced cellulose synthesis, providing further evidence for the function of multiple CESA subunits in cellulose synthesis. We show that reduced levels of cellulose synthesis, caused by mutations in cellulose synthase genes and in genes affecting cell expansion, activate lignin synthesis and defense responses through jasmonate and ethylene and other signaling pathways. These observations suggest that mechanisms monitoring cell wall integrity can activate lignification and defense responses.