AI Article Synopsis
- Poor control of certain weed species resistant to ALS-inhibiting herbicides has been observed in soybean fields in northeastern Italy, with limited confirmation of resistant populations.
- An extensive study in the Friuli Venezia Giulia region involved testing 58 weed accessions to determine their resistance status, species identification, mutant alleles identification, and the effectiveness of three pre-emergence herbicides.
- Results showed cross-resistance in most accessions, with two specific ALS mutant alleles identified as responsible for the resistance; alternative herbicides like metribuzin, clomazone, and metobromuron are recommended for managing resistance.
Article Abstract
Poor control of spp. with herbicides inhibiting acetolactate synthase (ALS) has been observed for several years in soybean fields in north-eastern Italy, but to date only a few ALS-resistant populations have been confirmed. An extensive sampling of putatively resistant accessions was completed in the Friuli Venezia Giulia region, across an arable land area of about 3000 km. In total, 58 accessions were tested to confirm their resistance status, recognize the species, identify the mutant alleles endowing the resistance and determine the efficacy of 3 pre-emergence herbicides. Most accessions resulted in cross-resistance to thifensulfuron-methyl and imazamox. Genomic DNA were extracted from single seeds with a newly developed protocol; an allele-specific PCR assay revealed the presence of the 574-leucine in 20 accessions, of the 574-methionine in 22, and of both alleles in 9 accessions. The two variants showed a different spatial distribution. All resistant populations were ascribed to . resistant to ALS herbicides is well-established in this Italian region and its resistance is due to two ALS mutant alleles. Metribuzin, clomazone and metobromuron can be used as alternative herbicides to be applied in pre-emergence and they should be integrated into the management strategies to limit the spread of resistance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9860533 | PMC |
| http://dx.doi.org/10.3390/plants12020332 | DOI Listing |
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