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Journal of Botany
Volume 2014 (2014), Article ID 818797, 10 pages
Research Article

Morphoanatomical and Biochemical Changes in the Roots of Rice Plants Induced by Plant Growth-Promoting Microorganisms

1Laboratório de Proteção de Plantas, Programa de Pós-Graduação em Agronomia (ICA), Universidade Federal Rural da Amazônia, 66077-830 Belém, PA, Brazil
2Laboratório de Botânica, Embrapa Amazônia Oriental, Belém, PA, Brazil
3Laboratório de Fitopatologia, Embrapa Arroz e Feijão, 75375-000 Goiânia, GO, Brazil
4Laboratório de Anatomia Vegetal, Instituto de Ciências Biológicas, Universidade Federal de Goiás, Campus II, 74001-970 Goiânia, GO, Brazil

Received 23 June 2014; Revised 14 October 2014; Accepted 28 October 2014; Published 25 November 2014

Academic Editor: Bernd Schneider

Copyright © 2014 Marcela Cristiane Ferreira Rêgo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The goal of the present study was to characterize anatomical and biochemical changes in rice plant roots in response to seed treatment with rhizobacteria (Burkholderia pyrrocinia (R-46) + Pseudomonas fluorescens (R-55)) and Trichoderma asperellum (Ta: mixture of strains T-06, T-09, T-12, and T-52). The experimental design was completely randomized, with six treatments (R-46, R-55, R-46 + R-55, Ta+ R-46 + R-55, Ta, and control) and ten replicates. Treatments Ta and R-46 + R-55 increased the root length and diameter as well as the cortex expansion and induced a 2% expansion of the aerenchymal space. Treatments Ta and R-46 increased the vascular cylinder diameter. The number of protoxylem poles and metaxylem vessel elements was increased by R-46 and R-55. The total phenol content increased with treatments Ta, R-46 + R-55, R-46, and R-55, and all the treatments increased the flavonoid content. The lignin content increased with the Ta and R-55 treatments. All the root architecture modifications resulting from the interaction between seedlings and bioagents (rhizobacteria and Trichoderma spp.) observed in the present study favored the root plasticity of rice seedlings.