Cell wall remodeling under abiotic stress.

Cell wall remodeling under abiotic stress.
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DOI:
10.3389/fpls.2014.00771
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发表时间:
2014
影响因子:
5.6
通讯作者:
Tenhaken R
Tenhaken R
中科院分区:
生物学2区
文献类型:
--
作者:
Tenhaken R

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暴露在非生物胁迫下的植物在多个层面上对不利条件做出反应。干旱胁迫下的一个挑战是减少地上部的生长,同时保持根的生长,这一过程需要不同的细胞壁合成和重塑。在这一过程中的关键角色是活性氧物种(ROS)和过氧化物酶的形成,它们最初使细胞壁的酚类化合物和糖蛋白交联,导致硬化。ROS的功能在转化完细胞壁中所有的过氧化物酶底物后发生转移。如果在长时间的胁迫过程中ROS-水平保持在较高水平,就会形成OH°-自由基,从而导致聚合物的裂解。在木葡聚糖修饰酶和膨胀素的共同作用下,由此产生的细胞壁松动允许压力下的器官进一步生长。
Plants exposed to abiotic stress respond to unfavorable conditions on multiple levels. One challenge under drought stress is to reduce shoot growth while maintaining root growth, a process requiring differential cell wall synthesis and remodeling. Key players in this process are the formation of reactive oxygen species (ROS) and peroxidases, which initially cross-link phenolic compounds and glycoproteins of the cell walls causing stiffening. The function of ROS shifts after having converted all the peroxidase substrates in the cell wall. If ROS-levels remain high during prolonged stress, OH°-radicals are formed which lead to polymer cleavage. In concert with xyloglucan modifying enzymes and expansins, the resulting cell wall loosening allows further growth of stressed organs.
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