Initial invasion of glyphosate‐resistant <i>Amaranthus palmeri</i> around grain‐import ports in Japan

Shimono, Ayako; Kanbe, Hiroki; Nakamura, Shunta; Ueno, S.; Yamashita, Jun; Asai, Motoaki

doi:10.1002/ppp3.10156

Cited by 13 publications

(10 citation statements)

References 38 publications

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“…Highly contaminating species are known as major weeds in farmlands, and these species are often reported to be herbicide-resistant (Owen et al 2014). Herbicideresistant weed seeds have been reported as contaminants in commercial grains (Michael et al 2010;Shimono et al 2010), and the establishment of herbicide-resistant weed species is common at major grain landing ports in Japan (Shimono et al 2015;Shimono et al 2020). Gene ow via pollen or seed movement from resistant plants could promote the rapid expansion of resistance alleles to previously herbicide-susceptible populations (Busi et al 2011).…”

Section: Discussionmentioning

confidence: 99%

The role of weed seed contamination in grain commodities as propagule pressure

Ikeda

Nishi

Asai³

et al. 2022

Biol Invasions

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The international grain trade is a major pathway for the introduction of alien plants because grain commodities can be contaminated with various weed seeds. To evaluate how alien weed seeds derived from imported grain commodities affect local vegetation in international trading ports, we conducted a vegetation survey on a set of grain landing ports and non-grain landing ports in nine regions throughout Japan to compare the vegetation between these two types of ports. We also surveyed weed seed contamination of wheat imported into Japan, and the contamination rate was calculated for each species based on our survey and previous studies on weed seed contamination. The vegetation clearly differed between the grain landing ports and the non-grain ports. In the grain landing ports, alien species were more abundant than in non-grain landing ports. All indicator species of the grain landing ports were reported to be contaminants in grain commodities. Furthermore, there was a tendency for the more abundant species at the grain landing ports to show higher contamination rates in grain commodities.These results indicate that contaminant seeds spill from imported grain in grain landing ports, and highly contaminated species are likely to become established. We clearly show that weed seed contamination in grain commodities plays an important role in propagule pressure. Gathering information about the prevalence of weeds in grain-exporting countries and monitoring the weed species composition in imported grain commodities is becoming increasingly important for predicting the unintentional introduction of troublesome weeds and identifying effective weed management options.

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Section: Discussionmentioning

confidence: 99%

The role of weed seed contamination in grain commodities as propagule pressure

Ikeda

Nishi

Asai³

et al. 2022

Biol Invasions

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“…Both Walla Walla and Palouse in the Pacific Northwest export grain through the Port of Portland terminal to the world. Despite precautions, weed seeds, including A. cotula , regularly move between continents as contaminants in grain shipments ( Shimono and Konuma 2008 ; Shimono et al 2010 , 2020 ; Conn 2012 ; Lehan et al 2013 ; Early et al 2016 ). Hence, A. cotula seeds from the Pacific Northwest could have been introduced to India as contaminants in grain shipments historically.…”

Section: Discussionmentioning

confidence: 99%

“…Established measures include limiting machinery movement, improving cleaning of equipment, ensuring use of certified seed and using new technology to clean grain of seeds during harvest ( Gervilla et al 2019 ; Norsworthy et al 2020 ; Owen and Powles 2020 ). Trade and transportation of seed contamination of crops, especially with herbicide-resistant weeds, within and between continents ( Shimono et al 2010 , 2020 ) can be particularly problematic. Future studies should focus on the origin and global migration routes of A. cotula to mitigate further spread.…”

Section: Discussionmentioning

confidence: 99%

Genetic diversity and population structure of a global invader Mayweed chamomile (Anthemis cotula): management implications

et al. 2021

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Mayweed chamomile (Anthemis cotula L.) is a globally invasive, troublesome annual weed but knowledge of its genetic diversity, population structure in invaded regions, and invasion patterns remains unstudied. Therefore, germplasm from 19 A. cotula populations (sites) from three geographically distinct invaded regions: the Walla Walla Basin (located in southern Washington) and the Palouse (located in both northern Idaho and eastern Washington), Pacific Northwest, USA and Kashmir Valley, India were grown in the greenhouse for DNA extraction and sequencing. A total of 18,829 SNPs were called and filtered for each of 89 samples. Pairwise-FST , Nei’s genetic distance, heterozygosity, Wright’s inbreeding coefficient (F), and self-fertilization rates were estimated for populations within and among the three regions with a total of 19 populations comprised of 89 individuals. Overall measurements of genetic variation were low but significant among regions, populations, and individuals. Despite the weak genetic structure, two main genetic clusters were evident, one comprised of populations from Palouse and Kashmir Valley, the other comprised of populations from the Walla Walla Basin. Significant selfing was observed in populations from the Walla Walla Basin and Palouse but not from Kashmir Valley, indicating that Mayweed chamomile in the Pacific Northwest USA could persist with low pollinator or pollen donor densities. Although FST values between the regions indicate Palouse populations are more closely related to Kashmir Valley than to Walla Walla Basin populations. Based on Migrate-n analysis, panmixis was the most likely model, suggesting an unrestricted gene flow among all three regions. Our study indicated that Kashmir Valley populations either originated from or shared the origin with the Palouse populations, suggesting human-mediated migration of A. cotula between regions.

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“…The impact of pollen-mediated dispersal of resistance genes would be mainly associated with the development of patches of resistant plants at the farm level and this would likely increase the initial frequency of resistant plants within populations (Gressel, 2009;Beckie et al, 2019). Pollen spread contributes to a higher frequency of herbicide-resistant plants compared to the expected initial frequency of herbicide-resistant individuals (10 -8 to 10 -9 ) in herbicide unselected populations, and it plays an important role in resistance evolution by increasing the incidence of herbicide-resistant weeds across a region (Sarangi et al, 2017;Beckie et al, 2019;Shimono et al, 2020). However, the impact of the pollen-mediated gene flow process on herbicide-sensitivity of receptor susceptible populations is modulated by several factors such as particular gene and alleles, species ploidy, genetic inheritance of resistance, fitness costs, species ecological traits (seed fecundity, seed-bank ecology and outcrossing rate) and agricultural Adv Weed Sci.…”

Section: Gene Flowmentioning

confidence: 99%

Global patterns of herbicide resistance evolution in Amaranthus spp .: an analysis comparing species, cropping regions and herbicides

Yanniccari¹,

Gaines²,

Scursoni³

et al. 2022

Advances in Weed Science

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Initial invasion of glyphosate‐resistant Amaranthus palmeri around grain‐import ports in Japan

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 13 publications

References 38 publications

The role of weed seed contamination in grain commodities as propagule pressure

The role of weed seed contamination in grain commodities as propagule pressure

Genetic diversity and population structure of a global invader Mayweed chamomile (Anthemis cotula): management implications

Global patterns of herbicide resistance evolution in Amaranthus spp .: an analysis comparing species, cropping regions and herbicides

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