Abstract
Main conclusion
Higher vacuolar proton pump activity may increase plant energy and nutrient use efficiency and provide the nexus between plant inoculation with Herbaspirillum seropedicae and growth promotion.
Abstract
Global change and growing human population are exhausting arable land and resources, including water and fertilizers. We present inoculation with the endophytic plant-growth promoting bacterium (PGPB) Herbaspirillum seropedicae as a strategy for promoting growth, nutrient uptake and photosynthetic efficiency in rice (Oryza sativa L.). Because plant nutrient acquisition is coordinated with photosynthesis and the plant carbon status, we hypothesize that inoculation with H. seropedicae will stimulate proton (H+) pumps, increasing plant growth nutrient uptake and photosynthetic efficiency at low nutrient levels. Plants were inoculated and grown in pots with sterile soil for 90 days. Herbaspirillum seropedicae endophytic colonization was successful and, as hypothesized, inoculation (1) stimulated root vacuolar H+ pumps (vacuolar H+-ATPase and vacuolar H+-PPase), and (2) increased plant growth, nutrient contents and photosynthetic efficiency. The results showed that inoculation with the endophytic bacterium H. seropedicae can promote plant growth, nutrient uptake and photosynthetic efficiency, which will likely result in a more efficient use of resources (nutrients and water) and higher production of nutrient-rich food at reduced economic and environmental costs.
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Acknowledgements
This work was supported by Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro—FAPERJ (#E-26/110.081/2014; #E-26/111.428/2014; #E-26/111.458/2014), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (#475436/2010-5; #312399/2013-8 Grants), Fundação para a Ciência e a Tecnologia (projects PTDC/AGRO-PRO/115888/2009, PTDC/AGR-PRO/1852/2014 and UIDB/00329/2020, and postdoc grant SFRH/BPD/85419/2012 to Teresa Dias), and CNPq (Postdoc grant to Juliana Melo). We are grateful to Ana Corrêa for the English proof-reading, and to the Editor and Reviewer for their comments and suggestions, which greatly improved the present paper.
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Ramos, A.C., Melo, J., de Souza, S.B. et al. Inoculation with the endophytic bacterium Herbaspirillum seropedicae promotes growth, nutrient uptake and photosynthetic efficiency in rice. Planta 252, 87 (2020). https://doi.org/10.1007/s00425-020-03496-x
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DOI: https://doi.org/10.1007/s00425-020-03496-x