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<p>Rhizospheric microorganisms, individually or in consortia, interact with root exudates and influence plant growth. This study investigated the effect of three <i>Streptomyces</i> isolates (CLV89, CLV104, and CLV179) individually or in co-inoculation, as plant growth-promoting rhizobacteria on maize (<i>Zea mays</i> L.). This study examined their impact on maize growth and the metabolic profile of root exudates. Maize seeds were treated with <i>Streptomyces</i> at single, dual, or triple co-inoculation, and vegetative growth was assessed. Root exudates were collected hydroponically and analyzed for concentration of reducing sugars, amino acids, proteins, and phenolic compounds. Co-inoculation with two or three isolates positively influenced plant growth, with the triple inoculation promoting greater shoot growth compared to combinations involving CLV104. However, root length reduced with the triple inoculation compared to single and dual inoculations of CLV104. Biomass accumulation was highest in plants co-inoculated with CLV104 + CLV179, which resulted in greatest root biomass despite shorter root length. These findings highlight that co-inoculation can be more effective than triple inoculation, emphasizing the importance of carefully selecting consistent strains to optimize plant growth. Additionally, root-S<i>treptomyces</i> interactions modulated the exudation of phenolic acids, with pathways varying depending on the specific strains involved. Ferulic acid was detected in all treatments assessed, whereas hydroxybenzoic acid was found only in the exudates from the roots of the triple-inoculated plants.</p>

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Co-inoculation with Streptomyces isolates promotes plant growth and modulates root exudation in maize

  • 期刊论文

  • 发表日期：

    2025年4月5日

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  • Waldo Pereira Neto,
  • Júlia Beninca Guterres,
  • Laura Alcântara da Luz,
  • Isabela Abbud Barros,
  • Felipe Dias Bandeira Berleze,
  • Luísa Machado Ramos,
  • Leandro Vieira Astarita,
  • Eliane Romanato Santarém

摘要

Rhizospheric microorganisms, individually or in consortia, interact with root exudates and influence plant growth. This study investigated the effect of three Streptomyces isolates (CLV89, CLV104, and CLV179) individually or in co-inoculation, as plant growth-promoting rhizobacteria on maize (Zea mays L.). This study examined their impact on maize growth and the metabolic profile of root exudates. Maize seeds were treated with Streptomyces at single, dual, or triple co-inoculation, and vegetative growth was assessed. Root exudates were collected hydroponically and analyzed for concentration of reducing sugars, amino acids, proteins, and phenolic compounds. Co-inoculation with two or three isolates positively influenced plant growth, with the triple inoculation promoting greater shoot growth compared to combinations involving CLV104. However, root length reduced with the triple inoculation compared to single and dual inoculations of CLV104. Biomass accumulation was highest in plants co-inoculated with CLV104 + CLV179, which resulted in greatest root biomass despite shorter root length. These findings highlight that co-inoculation can be more effective than triple inoculation, emphasizing the importance of carefully selecting consistent strains to optimize plant growth. Additionally, root-Streptomyces interactions modulated the exudation of phenolic acids, with pathways varying depending on the specific strains involved. Ferulic acid was detected in all treatments assessed, whereas hydroxybenzoic acid was found only in the exudates from the roots of the triple-inoculated plants.