Salinity in agricultural soil is a major problem around the world, with negative consequences for the growth and production of a wide range of crops. To counteract these harmful effects, plants sometimes have bacterial partners that contain the enzyme 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, which acts by degrading ACC (the precursor of ethylene in all higher plants). The enzymatic activity of ACC deaminase results in the production of α-ketobutyrate and ammonia, which, by lowering ACC levels, prevents excessive increases in the synthesis of ethylene under various stress conditions and is one of the most efficient mechanisms to induce plant tolerance to salt stress. In the present review, recent works on the role of ACC deaminase are discussed alongside its importance in promoting plant growth under conditions of salt stress in endophytic and rhizospheric bacteria, with some emphasis on Bacillus species. In addition, the toxic effects of soil salinity on plants and microbial biodiversity are analysed. Recent findings on the synergetic functioning of ACC deaminase and other bacterial mechanisms of salt stress tolerance, such as trehalose accumulation, are also summarized. Finally, we discuss the various advantages of ACC deaminase-producing bacilli as bioinoculants to address the problem of salinity in agricultural soils.

农业土壤中的盐分是世界范围内的主要问题，对多种作物的生长和生产产生负面影响。为了抵消这些有害影响，植物有时会带有细菌伴侣，其中含有1-氨基环丙烷-1-羧酸（ACC）脱氨酶，该酶会降解ACC（所有高等植物中的乙烯前体）。ACC脱氨酶的酶促活性导致产生α-酮丁酸和氨，通过降低ACC含量，可以防止在各种胁迫条件下乙烯合成的过度增加，并且是诱导植物对盐耐受的最有效机制之一强调。在目前的评论中，芽孢杆菌属。此外，分析了土壤盐分对植物和微生物多样性的毒性作用。还总结了有关ACC脱氨酶和其他细菌对盐胁迫耐受性的协同作用（如海藻糖积累）的最新发现。最后，我们讨论了产生ACC脱氨酶的细菌作为生物触媒剂的各种优势，以解决农业土壤中的盐度问题。