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<p>Vast coastal area of Bangladesh remains uncultivated or production is limited due to tidal surge. This investigation was carried out to isolate salt-adapted bacteria from rice rhizosphere and assess their impact on stimulation of vegetative growth, productivity and salt tolerance. 140 rice rhizosphere soil samples were collected across multiple locations of Bagerhat, Satkhira and Khulna districts of Bangladesh. Bacterial morphotypes obtained from all locations were initially screened based on Indole acetic acid production and Phosphate solubilizing capacity. Bacterial morphotypes showing positive response to both growth promoting factors were further screened through seed germination test at 8 dS/m. Twenty isolates were selected for pot experiment at three different salinity level, viz.: 8, 12 and 16 dS/m. Survivability of rice plants decreased with increasing salinity level as no plants survived at 16 dS/m. It was revealed that most of the promised bacterial morphotypes are members of the genus <i>Bacillus</i> through molecular characterization. The relative water content and total antioxidant capacity were increased 73% and 125% respectively at 8 dS/m by bacterial morphotype <i>Bacillus</i> sp. (in: <i>Firmicutes</i>) strain BDISOB146KhDa. It also showed the lowest proline content (7.65 µmoles/g FW) and electrolytic leakage (60.56%) along with highest relative water content (72.67%); total antioxidant capacity (59.71&#xa0;mg AA/g FW) and yield (51.57&#xa0;g/hill) at 12 dS/m. The bacterial morphotype <i>Bacillus</i> sp. (in: <i>Firmicutes</i>) strain BDISOB146KhDa could be a potential candidate for commercial formulation to mitigate salt stress and maximize rice yield in coastal areas of Bangladesh; however, further validation through field trials is necessary before large-scale application.</p>

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Harnessing salt-adaptive plant growth-promoting rhizobacteria to improve rice resilience in saline soils

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Md. Hosen Ali,
  • Shila Chakraborty,
  • Tawseef Al Aff,
  • Sadia Islam Antu,
  • Shahira-Jahin,
  • Md. Atiqur Rahman Khokon

摘要

Vast coastal area of Bangladesh remains uncultivated or production is limited due to tidal surge. This investigation was carried out to isolate salt-adapted bacteria from rice rhizosphere and assess their impact on stimulation of vegetative growth, productivity and salt tolerance. 140 rice rhizosphere soil samples were collected across multiple locations of Bagerhat, Satkhira and Khulna districts of Bangladesh. Bacterial morphotypes obtained from all locations were initially screened based on Indole acetic acid production and Phosphate solubilizing capacity. Bacterial morphotypes showing positive response to both growth promoting factors were further screened through seed germination test at 8 dS/m. Twenty isolates were selected for pot experiment at three different salinity level, viz.: 8, 12 and 16 dS/m. Survivability of rice plants decreased with increasing salinity level as no plants survived at 16 dS/m. It was revealed that most of the promised bacterial morphotypes are members of the genus Bacillus through molecular characterization. The relative water content and total antioxidant capacity were increased 73% and 125% respectively at 8 dS/m by bacterial morphotype Bacillus sp. (in: Firmicutes) strain BDISOB146KhDa. It also showed the lowest proline content (7.65 µmoles/g FW) and electrolytic leakage (60.56%) along with highest relative water content (72.67%); total antioxidant capacity (59.71 mg AA/g FW) and yield (51.57 g/hill) at 12 dS/m. The bacterial morphotype Bacillus sp. (in: Firmicutes) strain BDISOB146KhDa could be a potential candidate for commercial formulation to mitigate salt stress and maximize rice yield in coastal areas of Bangladesh; however, further validation through field trials is necessary before large-scale application.