Open AccessSelection of rhizobacteria isolates with bioherbicide potential against Palmer amaranth (Amarathus palmeri S. Wats.)
Author(s) -
Candelario Verdugo-Navarrete,
Ignacio Eduardo MaldonadoMendoza,
Claudia Castro-Martínez,
Karla Yeriana LeyvaMadrigal,
Juan Carlos MartínezÁlvarez
Publication year - 2021
Publication title -
brazilian journal of microbiology
Language(s) - English
Resource type - Journals
eISSN - 1678-4405
pISSN - 1517-8382
DOI - 10.1007/s42770-021-00514-2
Subject(s) - rhizobacteria , bioherbicide , amaranth , germination , biology , rhizosphere , weed , amaranthaceae , botany , horticulture , agronomy , bacteria , genetics
Crop yield and quality are affected by the presence of weeds such as Palmer amaranth. Chemical control is the most commonly used method to eradicate weeds, due to its quickness and efficacy. However, the inappropriate use of chemical herbicides can lead to resistant weed biotypes, as well as problems related to environmental pollution and human health hazards. One ecological alternative to combat weeds is the use of deleterious rhizobacteria (DRB). We evaluated the potential bioherbicidal effect in 15 DRB isolates from the rhizosphere of Palmer amaranth, both in vitro and in greenhouse tests. Isolates TR10 and TR18 inhibited seed germination in vitro, whereas the TR25 and TR36 isolates showed the potential to inhibit Palmer amaranth plant development in growth room assays without affecting maize and common bean germination and growth. These four isolates were molecularly identified as either Pseudomonas sp. (TR10 and TR36), Enterobacter sp. (TR18), or Bacillus sp. (TR25). In addition, the production of volatiles and diffusible metabolites were identified as possible mechanisms of germination arrestment and plant development inhibition. This study suggests the bioherbicide potential of some indigenous rhizobacteria against Palmer amaranth.