与种子耐脱水性有关的基础物质研究进展

耐脱水的获得和维持与种子的类型有关，正常型种子耐脱水，而顽拗形种子对脱水高度敏感，正常型种子的脱水耐性随发良过程而变化，种子成熟时胚的脱水耐性增强，其萌发时胚变为不耐脱水，当种子获得脱水耐性时，糖，LEA蛋白质和抗氧化防御系统等保护性物质积累，但脱水耐性是一种复杂的数量的特性，任何一种单一的机制都不能 充分地解释脱水耐性，各种保护性物质协同调节脱水耐性，本文综述了近几年来关于种子耐脱水性与保护性物质相关性的研究进展。

Current Research of Basic Substances Related to Desiccation Tolerance in Seeds

The acquisition and maintenance of desiccation tolerance is related to the type of seed. Orthodox seeds are tolerant to desiccation while recalcitrant seeds are highly sensitive to desiccation. The desiccation tolerance changes during development of the orthodox seeds.Embryos becomes more tolerant as seeds mature and less tolerant as seeds germinate. The protective substances, such as sugars, LEA proteins and antioxidant defensive systems, are accumulated in orthodox seeds when the tolerance is acquired. The desiccation tolerance of seeds is of a complex and multifaceted properties, any one mechanism can't adequately explain the desiccation tolerance. Many protective substances cooperate with each other to modulate the desiccation tolerance. This report summed up the research advances on relationship between desiccation tolerance and protective substances in recent years.