期刊
MICROORGANISMS
卷 9, 期 8, 页码 -出版社
MDPI
DOI: 10.3390/microorganisms9081714
关键词
nitrogen fixation; indole-3-acetic acid (IAA); 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase; rice endophytic bacteria; salt stress; anti-oxidative enzymes
类别
资金
- grant MICRO4Legumes (Il microbioma vegetale simbionte come strumento per il miglioramento delle leguminose foraggere) (Italian Ministry of Agriculture) [89267]
- Italian Ministry of Education, University and Research (MIUR)
This study isolated culturable bacterial endophytes from the African rice Oryza glaberrima, which help host plants adapt to harsh environments. Inoculating Oryza glaberrima and Oryza sativa with N-fixer strains increased nitrogenase activity and content of nitrogen, carbon, and chlorophyll. These endophytes show potential in promoting growth of high-yielding crop varieties under unfavorable conditions.
Bacterial endophytes support the adaptation of host plants to harsh environments. In this study, culturable bacterial endophytes were isolated from the African rice Oryza glaberrima L., which is well-adapted to grow with poor external inputs in the tropical region of Mali. Among these, six N-fixer strains were used to inoculate O. glaberrima RAM133 and the Asian rice O. sativa L. cv. Baldo, selected for growth in temperate climates. The colonization efficiency and the N-fixing activity were evaluated and compared for the two rice varieties. Oryza sativa-inoculated plants showed a fairly good colonization efficiency and nitrogenase activity. The inoculation of Oryza sativa with the strains Klebsiella pasteurii BDA134-6 and Phytobacter diazotrophicus BDA59-3 led to the highest nitrogenase activity. In addition, the inoculation of 'Baldo' plants with the strain P. diazotrophicus BDA59-3 led to a significant increase in nitrogen, carbon and chlorophyll content. Finally, 'Baldo' plants inoculated with Kl. pasteurii BDA134-6 showed the induction of antioxidant enzymes activity and the maintenance of nitrogen-fixation under salt stress as compared to the unstressed controls. As these endophytes efficiently colonize high-yielding crop varieties grown in cold temperate climates, they become good candidates to promote their growth under unfavorable conditions.
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