Key Laboratory of Molecular Cytogenetics and Genetic Breeding of Heilongjiang Province,College of Life Science and Technology,Harbin Normal University,Heilongjiang
The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)；Postdoctoral Foundation of Heilongjiang Province ； Graduate Student Innovation Fund of Harbin Normal University
非生物胁迫制约了植物的生长和发育，并降低作物的产量。为了应对非生物胁迫，植物在进化过程中形成了一系列胁迫响应机制，包括肌醇（MI , myo-inositol）代谢途径。肌醇为一类化学性质稳定的极性小分子，植物可通过积累其糖苷类衍生物参与渗透调节途径，从而响应各种非生物胁迫。肌醇-1-磷酸合酶（MIPS, myo-inositol-1-phosphate synthase）、肌醇单磷酸酶（IMP, inositol monophosphtease）和肌醇加氧酶（MIOX, myo-inositol oxygenase）参与肌醇代谢途径。它们通过调控MI的含量，参与L-抗坏血酸（L-AsA, L-ascorbic acid）和部分细胞壁多糖的合成，响应盐、干旱、碱和低温等非生物胁迫。本文综述了肌醇的结构、生物学作用、肌醇代谢途径相关酶和肌醇衍生物在植物响应非生物胁迫中的研究进展，并对未来的研究方向进行了展望，旨在为利用肌醇代谢增强植物对非生物胁迫的抗性，培育抗逆植物品种提供理论基础。
Abiotic stress limits plant growth and development, leading to a reduction in crop yield. Plants have developed a series of stress response mechanisms to adapt to abiotic stress during evolution, including the myo-inositol (MI) metabolic pathway. MI is a class of small polar molecules with stable chemical properties. Plants can respond to a variety of abiotic stress by participating in osmoregulatory pathways through accumulating the glycoside derivatives of MI. Myo-inositol-1-phosphate synthase (MIPS), inositol monophosphate phosphatase (IMP), and myo-inositol oxygenase (MIOX) are involved in the MI metabolic pathway. They can participate in the synthesis of L-ascorbic acid (L-AsA) and partial cell wall polysaccharides by regulating the content of MI, and ultimately response to abiotic stresses such as salt, drought, alkali, and low temperature. This paper reviewed the research progress of the structure, biological functions of MI, MI metabolic pathway-related enzymes and its derivatives in plants response to abiotic stresses, providing an outlook to its future research directions. The aim of this study is to provide a theoretical basis for enhancing plant resistance to abiotic stresses by utilizing MI metabolism and breeding stress-resistant plant varieties.