title: A Root-Colonizing Pseudomonad Lessens Stress Responses in Wheat Imposed by CuO Nanoparticles.
abstract: Nanoparticle (NPs) containing essential metals are being considered in formulations of fertilizers to boost plant nutrition in soils with low metal bioavailability. This paper addresses whether colonization of wheat roots by the bacterium, Pseudomonas chlororaphis O6 (PcO6), protected roots from the reduced elongation caused by CuO NPs. There was a trend for slightly elongated roots when seedlings with roots colonized by PcO6 were grown with CuO NPs; the density of bacterial cells on the root surface was not altered by the NPs. Accumulations of reactive oxygen species in the plant root cells caused by CuO NPs were little affected by root colonization. However, bacterial colonization did reduce the extent of expression of an array of genes associated with plant responses to stress induced by root exposure to CuO NPs. PcO6 colonization also reduced the levels of two important chelators of Cu ions, citric and malic acids, in the rhizosphere solution; presumably because these acids were used as nutrients for bacterial growth. There was a trend for lower levels of soluble Cu in the rhizosphere solution and reduced Cu loads in the true leaves with PcO6 colonization. These studies indicate that root colonization by bacterial cells modulates plant responses to contact with CuO NPs.
authors: Department of Biological Engineering, Utah State University, Logan, Utah, 84322 4105, United States of America.
authors: Melanie
authors: M
authors: Wright
authors: Department of Biology, Utah State University, Logan, Utah, 84322 5305, United States of America.
authors: Joshua
authors: J
authors: Adams
authors: Department of Biological Engineering, Utah State University, Logan, Utah, 84322 4105, United States of America.
authors: Kwang
authors: K
authors: Yang
authors: Utah Water Research Laboratory, Utah State University, Logan, Utah, 84321, United States of America.
authors: Paul
authors: P
authors: McManus
authors: Plants Soils and Climate, Utah State University, Logan, Utah, 84322 4820, United States of America.
authors: Astrid
authors: A
authors: Jacobson
authors: Department of Biological Engineering, Utah State University, Logan, Utah, 84322 4105, United States of America.
authors: Aniket
authors: A
authors: Gade
authors: Utah Water Research Laboratory, Utah State University, Logan, Utah, 84321, United States of America.
authors: Joan
authors: J
authors: McLean
authors: Department of Biology, Utah State University, Logan, Utah, 84322 5305, United States of America.
authors: David
authors: D
authors: Britt
authors: Department of Biological Engineering, Utah State University, Logan, Utah, 84322 4105, United States of America.
authors: Anne
authors: A
authors: Anderson
mesh_terms: D003300:Copper / Q000494:pharmacology*; D053758:Nanoparticles; D018517:Plant Roots / Q000382:microbiology*; D011549:Pseudomonas / Q000254:growth & development / Q000302:isolation & purification*; D013312:Stress, Physiological; D014908:Triticum / Q000502:physiology*
chemical_list: D003300:Copper; C000520:cuprous oxide