ABSTRACT

This study investigated the plant growth-promoting effects of Leclercia adecarboxylata MO1 for Zn stress mitigation and plant growth improvement in Zn-contaminated soil. Results demonstrated that L. adecarboxylata MO1 produced siderophores that could solubilize Zn and silicate, had a tolerance to elevated levels of Zn supplementation (2 and 5 mM) in growth mediums, and produced significant amounts of indole-3-acetic acid (IAA). It was also found to promote plant growth under both control conditions and Zn toxicity (2 and 5 mM). Furthermore, L. adecarboxylata MO1 positively regulated physiochemical attributes by decreasing hydrogen peroxide (H₂O₂) and Zn uptake in both roots and shoots, improving antioxidant systems (e.g. catalase (CAT), peroxidase (POD), polyphenol peroxidase (PPO), superoxide anion (SOA), lipid peroxidation (MDA), and glutathione (GSH)), and reducing stress-responsive endogenous abscisic acid (ABA) and salicylic acid (SA) in plants grown under Zn toxicity of 2 and 5 mM, compared with non-inoculated plants.

摘要

这项研究调查了Leclercia adecarboxylata MO1对锌胁迫缓解和锌污染土壤中植物生长的促进作用。结果表明，L。adecarboxylata MO1产生的铁载体可以溶解锌和硅酸盐，对生长培养基中的锌补充水平（2和5 mM）具有耐受性，并产生大量的吲哚-3-乙酸（IAA）。还发现在控制条件和锌毒性（2和5 mM）下均可促进植物生长。此外，阿德莫氏乳酸菌MO1通过减少过氧化氢（H ₂ O _2）积极调节理化特性。）和锌在根和茎中的吸收，改善了抗氧化系统（例如过氧化氢酶（CAT），过氧化物酶（POD），多酚过氧化物酶（PPO），超氧阴离子（SOA），脂质过氧化（MDA）和谷胱甘肽（GSH）），与未接种的植物相比，在2和5 mM的Zn毒性下生长的植物中，降低了胁迫响应性的内源脱落酸（ABA）和水杨酸（SA）。