The effect of heavy metals on dinitrogen fixation by Rhizobium-white colover in a range of long-term sewage sludge amended and metal-contaminated soils
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Anthyllis vulneraria and Lotus corniculatus on calamine heaps form nodules with Bradyrhizobium liaoningense-related strains harboring novel in Europe symbiotic nifD haplotypes
2020, Applied Soil EcologyCitation Excerpt :This study revealed that the metal-tolerant Bradyrhizobium strains can nodulate L. corniculatus and A. vulneraria plants growing on Zn/Pb wastes. Likewise, other rhizobial genera, e.g., Ensifer, Mesorhizobium, Ochrobactrum, and Rhizobium spp., have been reported as symbionts forming effective nodules on metal-tolerant ecotypes of their legume host, suggesting that this capability may be widespread not only among the cosmopolitan rhizobia (Martensson and Witter, 1990; El-Aziz et al., 1991; Smith and Giller, 1992; Obbard and Jones, 1993; Ibekwe et al., 1995; Pajuelo et al., 2008a, 2008b). On the other hand, the diverse genus Bradyrhizobium shows the broadest legume hosts range among all rhizobial genera (Parker, 2015; Avontuur et al. 2019).
Long-term industrial metal contamination unexpectedly shaped diversity and activity response of sediment microbiome
2018, Journal of Hazardous MaterialsCitation Excerpt :Conversely, Alpha- and Betaproteobacteria classes were enhanced in the metal-contaminated sediments (Table S3), but only Alphaproteobacteria were enriched at the RNA level (Table S4), implying potentially enhanced activity. This is in agreement with previous observations showing some Alphaproteobacteria species reacting to metallic contaminants as potential bioindicators in a positive (e.g. members from Sphingomonadales) [45,46], but also negative manner (e.g. members from Rhizobiales) [47]. The second dominant phylum in metal-contaminated sediments was Firmicutes (Fig. 2), as previously described [7,12].
Cadmium in white lupin nodules: Impact on nitrogen and carbon metabolism
2013, Journal of Plant PhysiologyCitation Excerpt :In Cd-treated leguminous plants, structural alterations in leaves and roots have been reported (Vázquez et al., 1992, 2007), as well as in the root nodules of pea (Ausili et al., 2002), soybean (Chen et al., 2003) and white lupin (Carpena et al., 2003). Although the levels of Cd in agricultural soils are usually low, the metal has adverse effects on soil biological activity, reducing nodule formation and impairing nodule functioning in leguminous crops such as alfalfa (Porter and Sheridan, 1981), pea (Hernández et al., 1995), soybean (Balestrasse et al., 2001; Chen et al., 2003), white clover (Obbard and Jones, 1993) and white lupin (Zornoza et al., 2002). White lupin (Lupinus albus L.) is a temperate grain legume of great agronomic potential given its high seed protein content and positive effect on soil fertility.
Isolation and characterization of nitrogen fixing heterotrophic bacteria from the rhizosphere of pioneer plants growing on mine tailings
2012, Applied Soil EcologyCitation Excerpt :Evidently, more experiments are necessary to define the theoretical ecological niches in the rhizosphere of HM tolerant plants. Nitrogen-fixing activity of all the strains included in this work decreased with increasing HM concentration, an effect that has been widely reported (Chen et al., 2003; Obbard and Jones, 1993; Obbard et al., 1993). Many papers speculate on the importance of nitrogen fixation in phytoremediation processes of mine tailings, human-made residues where nitrogen fixation is the unique input mechanism of this element to the environment (Glick, 2003; Mendez et al., 2007; Wu et al., 2006).
Inoculation of Rhizobium (VR-1 and VA-1) induces an increasing growth and metal accumulation potential in Vigna radiata and Vigna angularis L. growing under fly-ash
2011, Ecological EngineeringCitation Excerpt :Gupta et al. (2004) also found that rhizobial population of metal contaminated sites was able to form an effective symbiosis with C. arietinum when grown on the soil in the laboratory. However, the present findings are similar to earlier reports on Trifolium hybridum (Obbard and Jones, 1993), where increase in inoculation size was found to be effective in promoting growth of the plants. Similar results have been reported in C. arietinum inoculated with Rhizobium, which proved to be a successful candidate for growing on fly-ash lagoons (Gupta et al., 2004).
Influence of fly ash aided phytostabilisation of Pb, Cd and Zn highly contaminated soils on Lolium perenne and Trifolium repens metal transfer and physiological stress
2011, Environmental PollutionCitation Excerpt :After their assimilation by plants, MTE could interfere with metabolic processes and are potentially toxic. Indeed, phytotoxicity results in chlorosis, weak plant growth, yield depression, and may even be accompanied by reduced nutrient uptake, disorders in plant metabolism and, in leguminous plants, a reduced ability to bind molecular nitrogen (Broos et al., 2005; Chaudri et al., 2000; Giller et al., 1998, 2009; Obbard and Jones, 1993). Plant growth, as evaluated by the biomass production, was increased of 30–70% by CFA amendments.