Scholarlink

<p>Salinity stress is a&#xa0;challenging environmental concern that severely restricts crop productivity in semi-arid and arid areas, especially during the last decades because of global climate change. The present study investigated the potential of three distinct rhizobacterial consortia to enhance the performance of the legume plant <i>Medicago sativa</i>&#xa0;L. under saline conditions. Consortium&#xa0;1 (T1) was composed of two rhizobial strains from our laboratory collection (RhOL6 and RhOL&#xa0;8) identified as <i>Ensifer meliloti</i>, together with two actinobacterial isolates (LBA9 (<i>Streptomyces roseoviolaceus)</i> and LBA8 (<i>Streptomyces cahuitamycinicus)</i>) obtained from the rhizosphere of <i>Argania spinosa</i>, consortium&#xa0;2 (T2) consisted of the same rhizobia, supplemented with two additional rhizobacterial strains (LB4 (<i>Halalkalibacterium</i> sp.) and LBP2 (<i>Bacillus</i> sp.)), also isolated from the rhizosphere of <i>A.&#xa0;spinosa</i>, and consortium&#xa0;3 (T3) included all six bacterial strains. These microbial combinations were assessed for their ability to promote plant growth and alleviate salt stress under controlled greenhouse conditions. The impact of consortia containing filamentous actinobacteria, rhizobia, and other rhizobacteria on alfalfa subjected to salinity stress has received limited research attention. The introduction of rhizobacterial consortia resulted in notable enhancements in shoot dry weight, leaf number, stomatal conductance, and chlorophyll content, along with a&#xa0;significant reduction in hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) accumulation, under both normal and saline (120 mM NaCl) conditions, compared to uninoculated plants. Furthermore, the selected consortia stimulated the activity of antioxidant enzymes such as superoxide dismutase (SOD) and catalase (CAT) and promoted the accumulation of osmolytes including soluble sugars and total proteins, indicating an effective mitigation of salt stress in <i>Medicago sativa</i>. The overall results of this study shed light on the effectiveness of rhizobacterial consortia inoculation in mitigating salt stress in alfalfa plants for better sustainable agriculture.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Inoculation with Rhizobacterial Consortia from Argan Tree Rhizosphere Mitigates Salt Stress and Enhances Growth in Alfalfa (Medicago Sativa L.)

  • 期刊论文

  • 发表日期：

    2025年8月1日

查看全文
  • Lamia Bichara,
  • Aiman Slimani,
  • Anas Raklami,
  • Tarik Sahlaoui,
  • Abdel-ilah Tahiri,
  • Khadijattou Taoufiq,
  • Khouzaima El Biari,
  • Mustapha Faghire,
  • Khalid Oufdou

摘要

Salinity stress is a challenging environmental concern that severely restricts crop productivity in semi-arid and arid areas, especially during the last decades because of global climate change. The present study investigated the potential of three distinct rhizobacterial consortia to enhance the performance of the legume plant Medicago sativa L. under saline conditions. Consortium 1 (T1) was composed of two rhizobial strains from our laboratory collection (RhOL6 and RhOL 8) identified as Ensifer meliloti, together with two actinobacterial isolates (LBA9 (Streptomyces roseoviolaceus) and LBA8 (Streptomyces cahuitamycinicus)) obtained from the rhizosphere of Argania spinosa, consortium 2 (T2) consisted of the same rhizobia, supplemented with two additional rhizobacterial strains (LB4 (Halalkalibacterium sp.) and LBP2 (Bacillus sp.)), also isolated from the rhizosphere of A. spinosa, and consortium 3 (T3) included all six bacterial strains. These microbial combinations were assessed for their ability to promote plant growth and alleviate salt stress under controlled greenhouse conditions. The impact of consortia containing filamentous actinobacteria, rhizobia, and other rhizobacteria on alfalfa subjected to salinity stress has received limited research attention. The introduction of rhizobacterial consortia resulted in notable enhancements in shoot dry weight, leaf number, stomatal conductance, and chlorophyll content, along with a significant reduction in hydrogen peroxide (H2O2) accumulation, under both normal and saline (120 mM NaCl) conditions, compared to uninoculated plants. Furthermore, the selected consortia stimulated the activity of antioxidant enzymes such as superoxide dismutase (SOD) and catalase (CAT) and promoted the accumulation of osmolytes including soluble sugars and total proteins, indicating an effective mitigation of salt stress in Medicago sativa. The overall results of this study shed light on the effectiveness of rhizobacterial consortia inoculation in mitigating salt stress in alfalfa plants for better sustainable agriculture.