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| The role of rhizobacteria in rice plants: Growth and mitigation of toxicity |
| Marcela C F Rêgo1, Aline F Cardoso1, Thayná da C Ferreira1, Marta C C de Filippi2, Telma F V Batista1, Rafael G Viana1, Gisele B da Silva1 |
1 Plant Protection Laboratory, Institute of Agrarian Sciences, Federal Rural University of Amazon, Belém 066.077-830, Brazil
2 Phytopathology Laboratory, Brazilian Enterprise for Agricultural Research-Rice and Beans, Goiânia 75375-000, Brazil |
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Abstract Allelopathic compounds reduce the growth and productivity of upland rice plants, especially in consecutive plantations.
The rhizobacteria Pseudomonas fluorescens BRM-32111 and Burkholderia pyrrocinia BRM-32113 have been recorded as
growth promoters in rice. This study was developed to understand the effect of the application of rhizobacteria on upland
rice plants in consecutive plantations. Experiments were conducted in a completely randomized design with four replications
of four treatments: rice seed inoculated with P. fluorescens BRM-32111, rice seed inoculated with B. pyrrocinia BRM-32113
(both sown on soil with rice residue), non-inoculated plants sown on soil with rice residue (control with residue (WR)), and
non-inoculated plants on soil with no residue (NR). Roots and seedling growth were adversely affected by allelopathic
compounds in control WR plants. Plants inoculated with rhizobacteria P. fluorescens BRM-32111 or B. pyrrocinia BRM-32113
induced an increase of 88% in biomass, 3% in the leaf area, 40% in length, 67% in root biomass, 21% in chlorophyll a,
53% in chlorophyll (a+b), 50% in rate of carbon assimilation (A), 227% in A/rubisco carboxylation efficiency (Ci) and 63%
in water use efficiency (WUE) compared to control WR plants. These results indicate that rhizobacteria P. fluorescens
BRM-32111 and B. pyrrocinia BRM-32113 increase the tolerance of rice plants to stress from allelochemicals. There are
possible practical agricultural applications of these results for mitigating the effects of environmental allelochemistry on
upland rice.
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Received: 13 January 2017
Accepted:
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| Fund: The authors thank the National Council for Scientific and Technological Development, Brazil, the Amazon Research Foundation, Brazil, and the Rural Federal University of Amazon, Brazil for the research funding and the Brazilian Federal Agency for the Support and Evaluation of Graduate Education for the grant of a doctorate scholarship. |
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Corresponding Authors:
Correspondence Marcela C F Rêgo, E-mail: marcela.rego@ufra.edu.br
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| About author: TIAN Zhong-wei, Tel: +86-25-84399623, E-mail: zhwtian@njau.edu.cn; |
Cite this article:
Marcela C F Rêgo, Aline F Cardoso, Thayná da C Ferreira, Marta C C de Filippi, Telma F V Batista, Rafael G Viana, Gisele B da Silva.
2018.
The role of rhizobacteria in rice plants: Growth and mitigation of toxicity. Journal of Integrative Agriculture, 17(12): 2636-2647.
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