Light-dependent control of redox balance and auxin biosynthesis in plants
Light-dependent control of redox balance and auxin biosynthesis in plants
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DOI：
10.4161/psb.29522
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发表时间：
2014-06
影响因子：
2.9
通讯作者：
Ken Yokawa;T. Koshiba;F. Baluška
中科院分区：
文献类型：
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作者：
Ken Yokawa;T. Koshiba;F. Baluška
生长素，吲哚-3-乙酸 (IAA)，在许多植物物种的形态发生、发育、生长和向性中发挥着至关重要的作用。生长素生物合成是通过特定途径完成的，具体取决于从氨基酸、色氨酸开始的几种酶。玉米中的生长素生物合成在表达丰富的 YUCCA (YUC) 蛋白的胚芽鞘尖端特别活跃，这对于生长素生物合成至关重要。体外实验证明生长素分子的前体；吲哚-3-乙醛（IAAld）是通过以非酶促方式照射色氨酸和黄素的混合物而产生的。此外，我们还检测到在光照下的拟南芥根细胞中立即产生活性氧（ROS）。从这个角度来看，我们提出在可变的环境光条件下对整个植物体的氧化还原稳态和生长素生物合成进行非酶调节。
Auxin, indole-3-acetic acid (IAA), plays a crucial role for morphogenesis, development, growth, and tropisms in many plant species. Auxin biosynthesis is accomplished via specific pathways depending on several enzymes starting from amino acid, tryptophan. Auxin biosynthesis in maize is particularly active at the tip of coleoptile expressing abundant YUCCA (YUC) protein, which is essential for auxin biosynthesis. In vitro experiment demonstrated that precursor of auxin molecule; indole-3-acetaldehyde (IAAld) was generated by illumination of the mixture of tryptophan and flavin in non-enzymatic manner. In addition, we have detected immediate production of reactive oxygen species (ROS) in illuminated Arabidopsis root cells. In this perspective, we are proposing the non-enzymatic regulation of redox homeostasis and auxin biosynthesis throughout the plant body under variable environmental light conditions.