Effect of pendimethalin on phosphate solubilizing bacteria inoculated to cowpea plants

Alagawadi, A. R.; Patil, V. C.; Reddy, T.K.R.

doi:10.1016/s0232-4393(11)80014-4

Cited by 2 publications

(1 citation statement)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In contrast to pendimethalin, clethodim is considered to rapidly dissipate in soil [33,44], mainly by photodegradation [18]; therefore, this herbicide induced fewer negative effects on plants compared with pendimethalin. The inhibition of the root growth produced by pendimethalin could explain the inhibition of symbiotic parameters, such as nitrogen fixation rate and nodule biomass (Figure 3), which were also detected in cowpea (Vigna unguiculata) and groundnut (Arachis hypogaea) plants [45,46]. We observed a significant reduction in nitrogenase activity (NFR), which indicates a decline in the metabolic activity in the nodule, as detected by Fox et al [33] with different pesticides.…”

Section: Discussionsupporting

confidence: 76%

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

View full text Add to dashboard Cite

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.

show abstract