乙烯调控植物营养缺乏胁迫响应的分子机制

Molecular mechanisms on ethylene regulation of nutrient deficiency stress responses in plants

植物的生长发育需要氮、磷、钾、硫、铁等14种矿质营养元素,而这些元素在不同类型土壤中的生物有效性存在极大差异。为了适应养分缺乏的环境,植物必须感知外部和内部矿质养分浓度的变化,并通过一系列信号转导产生形态和生理反应来促进对矿质营养元素的吸收和利用。乙烯是一种重要的植物气体激素,在植物生命周期的许多方面发挥着关键作用。近年来的大量研究表明,乙烯在调节植物响应不同营养缺乏胁迫中也发挥着重要的调控作用。本文全面总结了乙烯直接或与其他激素/化学信号分子协同调控不同营养胁迫响应的分子机制,并对今后的研究方向进行了展望。

The growth and development of plants require 14 essential mineral nutrient elements, such as nitrogen, phosphorus, potassium, sulfur, iron, etc. Nevertheless, the bioavailability of these elements varies greatly in the different types of soils. In order to adapt to nutrient-deficient environment, plants must sense the changes of external and internal mineral nutrient concentrations, and generate physiological and morphological responses via a series of signal transduction events, to facilitate the nutrient uptake and utilization. Ethylene is an essential gaseous plant hormone, and plays pivotal roles in many aspects of the plant life cycle. In recent years,accumulating studies have shown that ethylene also plays an important part in regulating plant responses to various nutrient deficiency stresses. Here, we comprehensively summarized the molecular mechanisms of ethylene regulating different nutritional stress responses directly or synergistically with other plant hormones/chemical signaling molecules, and gave an outlook for the future research.