ARABIDOPSIS TCH4, REGULATED BY HORMONES AND THE ENVIRONMENT, ENCODES A XYLOGLUCAN ENDOTRANSGLYCOSYLASE
ARABIDOPSIS TCH4, REGULATED BY HORMONES AND THE ENVIRONMENT, ENCODES A XYLOGLUCAN ENDOTRANSGLYCOSYLASE
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DOI：
10.1105/tpc.7.10.1555
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发表时间：
1995-10-01
期刊：
影响因子：
11.6
通讯作者：
BRAAM, J
中科院分区：
文献类型：
--
作者：
XU, W;PURUGGANAN, MM;BRAAM, J
植物对环境条件的适应需要将外部刺激的感知与形态发生机制联系起来。拟南芥TCH（触摸）基因的表达迅速上调，以响应环境刺激，但这种分子反应和发育变化之间的联系尚未建立。我们通过序列相似性和酶活性鉴定TCH 4为木葡聚糖内糖基转移酶。木葡聚糖内转糖基酶最有可能修饰细胞壁，这是植物形态的基本决定因素。我们确定，TCH 4的表达调节生长素和油菜素类固醇，环境刺激，并在发展过程中，由1-kb的区域。表达仅限于经历细胞壁修饰的扩增组织和器官。编码细胞壁修饰酶（如TCH 4）的基因的调节可能是植物对环境的形态发生反应的基础。
Adaptation of plants to environmental conditions requires that sensing of external stimuli be linked to mechanisms of morphogenesis. The Arabidopsis TCH (for touch) genes are rapidly upregulated in expression in response to environmental stimuli, but a connection between this molecular response and developmental alterations has not been established. We identified TCH4 as a xyloglucan endotransglycosylase by sequence similarity and enzyme activity. Xyloglucan endotranslycosylases most likely modify cell walls, a fundamental determinant of plant form. We determined that TCH4 expression is regulated by auxin and brassinosteroids, by environmental stimuli, and during development, by a 1-kb region. Expression was restricted to expanding tissues and organs that undergo cell wall modification. Regulation of genes encoding cell wall-modifying enzymes, such as TCH4, may underlie plant morphogenetic responses to the environment.