• ISSN 1008-505X
  • CN 11-3996/S

矿质营养调控植物开花时间的分子机制研究进展

Research advances in molecular mechanism of mineral nutrition-mediated regulation of plant flowering time

  • 摘要: 开花是高等植物产生种子和繁衍的一个必经过程,开花时间受光周期、温度、年龄、激素以及营养等因素调控。深入探究养分在植物开花中的作用机制和调控途径,挖掘其中的关键因子,有助于通过基因工程或分子育种提高作物养分利用效率、调控作物开花时间以及提高产量。近年来,氮、磷、钾、硫、铁、锌、铜等营养元素在开花中的作用与分子机制取得了一些重要进展。业已证明,植物在低氮或高氮条件下开花时间通常受到延迟。硝酸盐、铵盐和谷氨酰胺等氮素形态通过不同的途径调控植物开花,其中硝酸盐调控开花的分子机制涉及转录水平、转录后水平、蛋白磷酸化修饰等多层面调控,其与光周期、赤霉素、年龄等开花调控途径均存在关联。铵态氮和谷氨酰胺可通过促进转录因子Nhd1的表达,进而激活下游开花基因Hd3a的表达来调节水稻开花时间。PHO1介导的磷酸盐从根系向地上部转运在植物开花转变中发挥关键作用。低磷延缓植物开花,而高磷则促进开花。低磷对开花的抑制与茉莉酸信号有关,也可能受到光周期、温度、年龄等因素的影响。植物的钾素水平影响蔗糖和成花素FT的移动,进而促进或者抑制开花时间。缺铁延迟开花与bHLH38/100/101转录因子对CO的抑制有关。缺铜延迟植物开花可能与体内miR172FT的表达降低有关。锌缺乏会使植物开花延迟,高浓度锌可以促进植物开花,但具体机制仍不清楚。氮、磷、钾、铁等养分与调节植物生长与开花的信号物质,如生长素、赤霉素、茉莉酸、油菜素内酯、独脚金内酯、一氧化氮和蔗糖等之间存在密切联系,但这些信号物质在矿质营养调节开花中的作用与机理值得进一步解析。此外,由于土壤中经常存在多种养分胁迫,不同养分之间存在相互作用,而养分互作又如何影响开花时间仍不清楚。土壤养分胁迫还经常与其他环境胁迫共同发生,多重养分胁迫以及养分与环境因子组合胁迫下植物开花的分子机制也是需要关注的一个研究领域。

     

    Abstract: Flowering is a necessary process for higher plants to produce seeds and reproduction, and it is regulated by factors such as photoperiod, temperature, age, hormones, and nutrients. Exploring the mechanisms and regulatory pathways of nutrients in plant flowering, and identifying the key genes can help improve crop nutrient utilization efficiency, regulate flowering time, and increase yield through genetic engineering or molecular breeding. Significant progress has been achieved on the molecular regulating mechanisms of nitrogen, phosphorus, potassium, sulfur, iron, zinc, and copper in recent years. Both low or high nitrogen supply delay the flowering time of plants. Various nitrogen forms such as nitrate, ammonium, and glutamine regulate flowering time through different paths. The nitrate-mediated flowering regulation involves multi-level regulation such as transcription level, post-transcription level, and protein phosphorylation modification, and is associated with flowering pathways such as photoperiod, gibberellin, and age. Ammonium nitrogen and glutamine can regulate rice flowering time by promoting the expression of transcription factor Nhd1, thereby activating the expression of downstream flowering gene Hd3a. Low phosphorus delays plant flowering, while high phosphorus promotes flowering. PHO1-mediated phosphate transport from roots to shoots plays a crucial role in plant flowering transition. The jasmonic acid signal is involved in the inhibition of flowering by phosphorus deficiency. The regulation of flowering by phosphorus nutrition may also be related to flowering pathways such as photoperiod, temperature, and age pathways. Potassium nutrition regulates flowering by affecting the movement of sucrose and FT. Iron deficiency delays flowering through the negative regulation of CO by bHLH38/100/101 transcription factors. The postponed flowering time under Cu deficiency may be related to decreased expression of miR172 and FT. High zinc supply conditions promotes plant flowering while low zinc supply delay plant flowering. In general, nutrient signals have inseparable relationship with plant growth and flowering signaling substances, such as auxin, gibberellins, jasmonic acid, brassinosteroids, strigolactones, nitric oxide, sucrose. The roles of these signaling substances in mineral nutrient-mediated flowering regulation deserve further exploration. In addition, soils often suffered from multiple nutrient stresses, and the nutrients interact with each other. However, it is still unclear how nutrient interactions affect flowering. Soil nutrient stress often occurs in conjunction with other environmental stresses. The molecular mechanisms of the effect of combined nutrient and environmental stress on plant flowering should be investigated as well.

     

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