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<p>Plant growth-promoting bacteria from inner plant tissues have huge potential for enhancing crop growth, yield, and stress resistance. However, limited information is available on cultivable endophytic bacteria from the bulbs, fibrous roots, and buds of <i>Fritillaria thunbergii</i> Miq. (a medicinal plant), and their plant growth-promoting abilities. This study provides the first report on culturable endophytic bacterial diversity in <i>Fritillaria thunbergii</i> tissues. A total of 70 bacterial isolates were obtained, categorized into 13 genera, with <i>Bacillus</i>, <i>Priestia</i>, <i>Cytobacillus</i>, <i>Pseudomonas</i>, and <i>Microbacterium</i> being the most species-rich. The isolates were assessed for plant growth-promotion traits, including indole-3-acetic acid (IAA) production, phosphate solubilization, and siderophore production. Besides, some isolates (18.57%) showed broad-spectrum antagonistic activity against phytopathogenic fungi, such as <i>Fusarium oxysporum</i> and <i>F</i>. <i>solani</i>. Agar plate experiments revealed that inoculation with <i>Bacillus subtilis</i> strain ZY50 significantly increased the primary root length of <i>Brassica campestris</i> ssp. <i>chinensis</i> (pak choi) (<i>P</i> &lt; 0.05), while <i>Priestia megaterium</i> strain ZY9, <i>Pseudomonas nitroreducens</i> strain ZL10, and <i>Bacillus</i> sp. strain ZY5 did not significantly affect root and stem length. Notably, some strains had inhibitory effects on certain growth parameters. This study highlights the potential of endophytic bacteria from <i>F. thunbergii</i> in promoting plant nutrient uptake, enhancing biometric parameters, and providing biocontrol to reduce chemical inputs in conventional agriculture, suggesting their use as biofertilizers for sustainable agriculture.</p>

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Isolation, characterization, and plant growth-promoting activities of endophytic bacteria sourced from Fritillaria thunbergii Miq. (Liliaceae), a medicinal plant

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Jianyun Zhang,
  • Siyu Liao,
  • Weimin Zhang,
  • Zongfen Yu,
  • Yan Tian,
  • Dongmei He,
  • Hai Wang,
  • Zhuyun Yan

摘要

Plant growth-promoting bacteria from inner plant tissues have huge potential for enhancing crop growth, yield, and stress resistance. However, limited information is available on cultivable endophytic bacteria from the bulbs, fibrous roots, and buds of Fritillaria thunbergii Miq. (a medicinal plant), and their plant growth-promoting abilities. This study provides the first report on culturable endophytic bacterial diversity in Fritillaria thunbergii tissues. A total of 70 bacterial isolates were obtained, categorized into 13 genera, with Bacillus, Priestia, Cytobacillus, Pseudomonas, and Microbacterium being the most species-rich. The isolates were assessed for plant growth-promotion traits, including indole-3-acetic acid (IAA) production, phosphate solubilization, and siderophore production. Besides, some isolates (18.57%) showed broad-spectrum antagonistic activity against phytopathogenic fungi, such as Fusarium oxysporum and F. solani. Agar plate experiments revealed that inoculation with Bacillus subtilis strain ZY50 significantly increased the primary root length of Brassica campestris ssp. chinensis (pak choi) (P < 0.05), while Priestia megaterium strain ZY9, Pseudomonas nitroreducens strain ZL10, and Bacillus sp. strain ZY5 did not significantly affect root and stem length. Notably, some strains had inhibitory effects on certain growth parameters. This study highlights the potential of endophytic bacteria from F. thunbergii in promoting plant nutrient uptake, enhancing biometric parameters, and providing biocontrol to reduce chemical inputs in conventional agriculture, suggesting their use as biofertilizers for sustainable agriculture.