Yield of micropropagated sugarcane varieties in different soil types following inoculation with diazotrophic bacteria |
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Authors: | André Luiz Martinez de Oliveira Erineudo Lima de Canuto Segundo Urquiaga Veronica Massena Reis José Ivo Baldani |
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Institution: | 1. Embrapa Agrobiologia, km 47, Estrada Antiga Rio-S?o Paulo, C.P: 74505, CEP: 23890-000, Seropédica, RJ, Brazil 3. Centro de Ciências Biológicas, Universidade Estadual de Londrina, Londrina, PR, Brazil 2. Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Campo dos Goytacazes, RJ, Brazil
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Abstract: | It is well described that the beneficial interactions between plants and bacteria are genotype and site specific. Brazilian
sugarcane varieties can obtain up to 70% of their nitrogen requirement from biological nitrogen fixation (BNF), and this contribution
is related to the Brazilian breeding and selection processes, by example of the variety SP70-1143. In this study the effect
of two inoculation mixtures containing diazotrophic bacteria in our earlier pot experiment was evaluated with two sugarcane
varieties, a known responder, SP70-1143, and a newly selected variety, SP81-3250, to investigate the sugarcane genotype effect
and the role of the mixtures. The sugarcane varieties SP70-1143 and SP81-3250 were grown under commercial field conditions
at three sites with contrasting soil types: an Alfisol, an Oxisol and an Ultisol that means a low, medium and high natural
fertility respectively. The stem yield and BNF contribution in response to bacterial inoculation were influenced by the strain
combinations in the inoculum, the plant genotype, and the soil type and nitrogen fertilization, confirming the genetic and
environmental influence in PGP-bacteria interactions. Inoculation effects on the BNF contribution and stem yield increased
in the variety SP70-1143 grown in the Alfisol without nitrogen fertilization for three consecutive crops, and it was equivalent
to the annual nitrogen fertilization. The plants grown in the Oxisol showed small increases in the productivity of the variety
SP70-1143, and in the Ultisol the sugarcane plants presented even decreases in the stem productivity due to inoculation with
diazotrophic bacteria mixtures. The results demonstrate the feasibility of the inoculation technology using diazotrophic bacteria
in micropropagated sugarcane varieties grown in soils with low to medium levels of fertility. In addition, the results also
indicated that specific plant – bacteria – environment combinations are needed to harness the full benefits of BNF.
Section Editor: C. P. Vance |
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Keywords: | Azospirillum amazonense biological nitrogen fixation Burkholderia tropica Gluconacetobacter diazotrophicus Herbaspirillum rubrisubalbicans Herbaspirillum seropedicae |
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