Siderophore-Producing Rhizobacteria as a Promising Tool for Empowering Plants to Cope with Iron Limitation in Saline Soils: A Review

Maria J.FERREIRA; Helena SILVA; Angela CUNHA

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Siderophore-Producing Rhizobacteria as a Promising Tool for Empowering Plants to Cope with Iron Limitation in Saline Soils: A Review

机译：产生铁载体的根际细菌作为有前途的工具，可帮助植物应对盐渍土中的铁含量限制：综述

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Iron (Fe) bioavailability to plants is reduced in saline soils;however,the exact mechanisms underlying this effect are not yet completely understood.Siderophore-expressing rhizobacteria may represent a promising alternative to chemical fertilizers by simultaneously tackling salt-stress effects and Fe limitation in saline soils.In addition to draught,plants growing in arid soils face two other major challenges:high salinity and Fe deficiency.Salinity attenuates growth,affects plant physiology,and causes nutrient imbalance,which is,in fact,one of the major consequences of saline stress.Iron is a micronutrient essential for plant development,and it isrequired by several metalloenzymes involved in photosynthesis and respiration.Iron deficiency is associated with chlorosis and low crop productivity.The role of microbial siderophores in Fe supply to plants and the effect of plant growth-promoting rhizobacteria (PGPR) on the mitigation of saline stress in crop culture are well documented.However,the dual effect of siderophore-producing PGPR,both on salt stress and Fe limitation,is still poorly explored.This review provides a critical overview of the combined effects of Fe limitation and soil salinization as challenges to modern agriculture and intends to summarize some indirect evidence that argues in favour of siderophore-producing PGPR as biofertilization agents in salinized soils.Recent developments and future perspectives on the use of PGPR are discussed as clues to sustainable agricultural practices in the context of present and future climate change scenarios.

机译：在盐渍土壤中植物对铁的生物利用度降低;但是，尚未完全理解这种作用的确切机理。表达铁镁磷素的根瘤菌可通过同时解决盐胁迫效应和铁的限制来代表化学肥料的一种有前途的替代品。除干旱外，干旱土壤中生长的植物还面临着另外两个主要挑战：高盐度和铁缺乏。盐度会减缓生长，影响植物生理，并导致养分失衡，这实际上是干旱的主要后果之一。铁是植物生长必不可少的微量营养素，参与光合作用和呼吸作用的几种金属酶都需要铁。缺铁与萎黄病和农作物生产力低下有关。微生物铁载体在植物供铁中的作用和植物的作用促进生长的根际细菌（PGPR）可以减轻作物培养中的盐分胁迫。 Ver方面，仍未充分研究生产铁载体的PGPR对盐胁迫和Fe限制的双重作用。本文综述了Fe限制和土壤盐碱化对现代农业的挑战，提出了批评性综述，并打算总结一些间接证据支持在矿化土壤中生产铁载体的PGPR作为生物肥料。在当前和未来的气候变化情景中，讨论了有关PGPR使用的最新进展和未来观点，以此作为可持续农业实践的线索。

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《土壤圈（英文版）》 |2019年第4期|409-420|共12页
作者
Maria J.FERREIRA; Helena SILVA; Angela CUNHA;
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Biology Department and Centre for Environmental and Marine Studies(CESAM), University of Aveiro Campus de Santigo, Aveiro 3810-193 ,Portugal;

Biology Department and Centre for Environmental and Marine Studies(CESAM), University of Aveiro Campus de Santigo, Aveiro 3810-193 ,Portugal;

Biology Department and Centre for Environmental and Marine Studies(CESAM), University of Aveiro Campus de Santigo, Aveiro 3810-193 ,Portugal;

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Siderophore-Producing Rhizobacteria as a Promising Tool for Empowering Plants to Cope with Iron Limitation in Saline Soils: A Review

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