Endophytes from African Rice (Oryza glaberrima L.) Efficiently Colonize Asian Rice (Oryza sativa L.) Stimulating the Activity of Its Antioxidant Enzymes and Increasing the Content of Nitrogen, Carbon, and Chlorophyll

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.

Bibliographic Details

Main Authors:	Bianco, Carmen, Andreozzi, Anna, Romano, Silvia, Fagorzi, Camilla, Cangioli, Lisa, Perini, Matteo, Mengoni, Alessio, Defez, Roberto
Other Authors:	Ministero delle Politiche Agricole Alimentari e Forestali
Format:	artículo biblioteca
Published:	Multidisciplinary Digital Publishing Institute 2021-08-11
Subjects:	Nitrogen fixation, Indole-3-acetic acid (IAA), 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase, Rice endophytic bacteria, Salt stress, Anti-oxidative enzymes,
Online Access:	http://hdl.handle.net/10261/267888 http://dx.doi.org/10.13039/501100003407 http://dx.doi.org/10.13039/501100005401 http://dx.doi.org/10.13039/501100004434
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