Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 466, Issue -, Pages 503-512Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scitotenv.2013.07.032
Keywords
Nano-TiO2; Nitrogen-fixing symbiosis; Pea; Rhizobium leguminosarum bv. viciae 3841; Toxicity
Categories
Funding
- US EPA STAR [GR832371]
- EPA [GR832371, 150634] Funding Source: Federal RePORTER
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The impact of nano-TiO2 on Rhizobium-legume symbiosis was studied using garden peas and the compatible bacterial partner Rhizobium leguminosarum bv. viciae 3841. Exposure to nano-TiO2 did not affect the germination of peas grown aseptically, nor did it impact the gross root structure. However, nano-TiO2 exposure did impact plant development by decreasing the number of secondary lateral roots. Cultured R. leguminosarum by. viciae 3841 was also impacted by exposure to nano-TiO2, resulting in morphological changes to the bacterial cells. Moreover, the interaction between these two organisms was disrupted by nano-TiO2 exposure, such that root nodule development and the subsequent onset of nitrogen fixation were delayed. Further, the polysaccharide composition of the walls of infected cells of nodules was altered, suggesting that the exposure induced a systemic response in host plants. Therefore, nano-TiO2 contamination in the environment is potentially hazardous to the Rhizobium-legume symbiosis system. (C) 2013 Elsevier B.V. All rights reserved.
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