Effects of agrochemicals on the beneficial plant rhizobacteria in agricultural systems

Aloo, Becky Nancy; Mbega, Ernest R.; Makumba, Billy Amendi; Tumuhairwe, John Baptist

doi:10.1007/s11356-021-16191-5

Cited by 8 publications

(2 citation statements)

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“…However, despite a 10-fold increase in fertilizer production since the last century [39], the efficiency of N fertilization has declined due to the reduction in efficiency at higher levels of fertilizer application [40]. In addition to fertilizers, herbicides comprise 50% of total pesticides used globally [2] and continue expanding. Altogether, this results in a loss of soil organic matter and fertility [33], which drives increased application of chemical fertilizers and pesticides in an unsustainable manner.…”

Section: Discussionmentioning

confidence: 99%

“…Conventional agricultural practices use agrochemicals, such as insecticides, fungicides, and herbicides to control crop pests and increase productivity [1]. Among the agrochemicals, herbicides, which are used to control weeds, constitute 50% of the total pesticides [2]. Pendimethalin (CAS nº 40487-42-1) is the third most used herbicide after glyphosate and paraquat belonging to the dinitroaniline class [3].…”

Section: Introductionmentioning

confidence: 99%

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Reduction in the Use of Some Herbicides Favors Nitrogen Fixation Efficiency in Phaseolus vulgaris and Medicago sativa

Paniagua-López

Jiménez-Pelayo

Gómez-Fernández

et al. 2023

Plants

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In recent decades, the quality of agricultural soils has been seriously affected by the excessive application of pesticides, with herbicides being one of the most abundant. Continuous use of herbicides alters the soil microbial community and beneficial interactions between plants and bacteria such as legume-rhizobia spp. symbiosis, causing a decrease in the biological nitrogen fixation, which is essential for soil fertility. Therefore, the aim of this work was to study the effect of two commonly used herbicides (pendimethalin and clethodim) on the legume-rhizobia spp. symbiosis to improve the effectiveness of this process. Phaseolus vulgaris plants grown in pots with a mixture of soil:perlite (3:1 v/v), showed a 44% inhibition of nitrogen fixation rate with pendimethalin. However, clethodim, specifically used against monocots, did not induce significant differences. Additionally, we analyzed the effect of herbicides on root exudate composition, detecting alterations that might be interfering with the symbiosis establishment. In order to assess the effect of the herbicides at the early nodulation steps, nodulation kinetics in Medicago sativa plants inoculated with Sinorhizobium meliloti were performed. Clethodim caused a 30% reduction in nodulation while pendimethalin totally inhibited nodulation, producing a reduction in bacterial growth and motility as well. In conclusion, pendimethalin and clethodim application reduced the capacity of Phaseolus vulgaris and Medicago sativa to fix nitrogen by inhibiting root growth and modifying root exudate composition as well as bacterial fitness. Thus, a reduction in the use of these herbicides in these crops should be addressed to favor a state of natural fertilization of the soil through greater efficiency of leguminous crops.

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Section: Discussionmentioning

confidence: 99%