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<p>Searching sustainable management techniques to enhance plant resistance to drought is crucial for agriculture in stressful scenarios. This study aimed to investigate the role of Plant Growth-Promoting Bacteria (PGPB) strains on forage cactus pear performance under drought. Trials were conducted in greenhouse using forage cactus plants in randomized block experimental design, 8 × 2 factorial scheme, consisting of eight inoculation treatments [inoculation with <i>Paenibacillus</i> sp. IPACC38 and IPACC55, and <i>Bacillus subtilis</i> IPACC29 strains combined with and without nitrogen (N) fertilization] and two water regimes [control at 50% field capacity (FC) and drought at 25% FC]. Drought significantly decreased plant growth across all treatments, regardless of N/inoculation treatment. The best performance under drought was observed in plants grown without N and inoculated with IPACC29 and IPACC38 strains. Improved performance under drought was closely related to PGPB’s capacity to provide N accumulation for strategic photosynthetic pigments content, resulting in better root growth and plant development. Our findings reveal that IPACC29 and IPACC38 are the most promising PGPB strains for inoculating forage cactus pear, activating important defense responses against drought. This system offers alternative for cultivating cactus under water restriction and reduced N availability to increase green forage biomass production in dry regions.</p>

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Plant growth-promoting bacteria modulate metabolism and nitrogen accumulation to counteract drought damage in cactus pear plants

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月17日

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  • Gonçalves Albino Dauala,
  • Bruno Sousa Figueiredo da Fonseca,
  • Acacyara Batista de Sousa,
  • Stelamaris de Oliveira Paula-Marinho,
  • Pâmalla Graziely Carvalho Morais,
  • Marcos Renan Lima Leite,
  • Rodrigo Fonseca da Silva,
  • Rhaiana Oliveira de Aviz,
  • Maria Helena Ferreira Duarte,
  • Romilda Rodrigues Nascimento,
  • Elaine Martins da Costa,
  • Cácio Luiz Boechat,
  • Ademir Sérgio Ferreira de Araújo,
  • Renato Oliveira de Sousa,
  • José Hélio Costa,
  • Ricardo Loiola Edvan,
  • Francisco de Alcântara Neto,
  • Rafael de Souza Miranda

摘要

Searching sustainable management techniques to enhance plant resistance to drought is crucial for agriculture in stressful scenarios. This study aimed to investigate the role of Plant Growth-Promoting Bacteria (PGPB) strains on forage cactus pear performance under drought. Trials were conducted in greenhouse using forage cactus plants in randomized block experimental design, 8 × 2 factorial scheme, consisting of eight inoculation treatments [inoculation with Paenibacillus sp. IPACC38 and IPACC55, and Bacillus subtilis IPACC29 strains combined with and without nitrogen (N) fertilization] and two water regimes [control at 50% field capacity (FC) and drought at 25% FC]. Drought significantly decreased plant growth across all treatments, regardless of N/inoculation treatment. The best performance under drought was observed in plants grown without N and inoculated with IPACC29 and IPACC38 strains. Improved performance under drought was closely related to PGPB’s capacity to provide N accumulation for strategic photosynthetic pigments content, resulting in better root growth and plant development. Our findings reveal that IPACC29 and IPACC38 are the most promising PGPB strains for inoculating forage cactus pear, activating important defense responses against drought. This system offers alternative for cultivating cactus under water restriction and reduced N availability to increase green forage biomass production in dry regions.