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Title: | Inoculated Seed Endophytes Modify the Poplar Responses to Trace Elements in Polluted Soil | Authors: | VANNUCCHI, Francesca IMPERATO, Valeria SARAN, Anabel Staykov, Svetoslav D'HAEN, Jan Sebastiani, Luca VANGRONSVELD, Jaco THIJS, Sofie |
Issue Date: | 2021 | Publisher: | MDPI | Source: | AGRONOMY-BASEL, 11 (10) , (Art N° 1987) | Abstract: | Seed endophyte inoculation can enhance the plant tolerance to pollutants, which allows plant cultivation on trace element (TE) polluted soils. Methylobacterium sp. CP3 and Kineococcus endophyticus CP19 were tested in vitro for their tolerance to Zn and Cd and their plant growth promotion traits. The in vivo effects of bioaugmentation with individual strains or both strains were tested using two poplar cultivars, Populus deltoides x (P. trichocarpa x P. maximowiczii) 'Dender' and 'Marke', grown in TE polluted soil for six weeks. Methylobacterium sp. was found to grow on media enriched with 0.4 and 0.8 mM Cd, and both endophytes tolerated 0.6 and 1 mM Zn, due to the presence of genes involved in Zn and Cd tolerance and transport. Methylobacterium sp. showed an extracellular ion sequestration mechanism. Production of indole-3-acetic acid by Methylobacterium sp. and K. endophyticus, as well as phosphorus solubilization by Methylobacterium sp. were observed. Bioaugmentation with both endophytes increased the shoot length of Populus 'Marke' and enhanced the Mg uptake in both cultivars. Inoculation with Methylobacterium sp. reduced the bioaccumulation of Zn in 'Marke', conferring it an excluder strategy. Methylobacterium sp. and K. endophyticus seemed to improve the plant nutritional status, which can alleviate abiotic stress.</p> | Notes: | Thijs, S (corresponding author), Hasselt Univ, Ctr Environm Sci, Environm Biol, B-3590 Diepenbeek, Belgium. francesca.vn85@gmail.com; vale.imperato@gmail.com; saran.anabel@gmail.com; svetoslav.staykov95@gmail.com; jan.dhaen@uhasselt.be; luca.sebastiani@santannapisa.it; jaco.vangronsveld@uhasselt.be; sofie.thijs@uhasselt.be |
Keywords: | cadmium; Kineococcus endophyticus CP19; Methylobacterium sp; CP3; plant;growth promotion; Populus; zinc | Document URI: | http://hdl.handle.net/1942/36044 | e-ISSN: | 2073-4395 | DOI: | 10.3390/agronomy11101987 | ISI #: | WOS:000711766400001 | Rights: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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agronomy-11-01987-v6.pdf | Published version | 2.36 MB | Adobe PDF | View/Open |
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