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Long-term monitoring of feral genetically modified herbicide-tolerant Brassica napus populations around unloading Japanese ports.

Katsuta K, Matsuo K, Yoshimura Y, Ohsawa R - Breed. Sci. (2015)

Bottom Line: Genetically modified, herbicide-tolerant (GMHT) Brassica napus plants originating from seed spill have recently been found along roadsides leading from Japanese ports that unload oilseed rape.GMHT B. napus was found around 10 of 12 ports, but its proportion in the populations varied greatly by year and location.Furthermore, we found no herbicide tolerant B. juncea and B. rapa plants derived from crosses with GMHT B. napus.

View Article: PubMed Central - PubMed

Affiliation: Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries of Japan , Kasumigaseki, Tokyo 100-8950 , Japan.

ABSTRACT
Genetically modified, herbicide-tolerant (GMHT) Brassica napus plants originating from seed spill have recently been found along roadsides leading from Japanese ports that unload oilseed rape. Such introductions have potential biodiversity effects (as defined by the Cartagena Protocol): these include replacement of native elements in the biota through competitive suppression or hybridization. We conducted surveys in the period 2006-2011 to assess such threats. We examined shifts in the population distribution and occurrence of GMHT plants in 1,029 volunteer introduced assemblages of B. napus, 1,169 of B. juncea, and 184 of B. rapa around 12 ports. GMHT B. napus was found around 10 of 12 ports, but its proportion in the populations varied greatly by year and location. Over the survey period, the distributions of a pure non-GMHT population around Tobata and a pure GMHT population around Hakata increased significantly. However, there was no common trend of population expansion or contraction around the 12 ports. Furthermore, we found no herbicide tolerant B. juncea and B. rapa plants derived from crosses with GMHT B. napus. Therefore, GMHT B. napus is not invading native vegetation surrounding its populations and not likely to cross with congeners in Japanese environment.

No MeSH data available.


Related in: MedlinePlus

Time series analyses of the numbers of Brassica napus populations around 12 unloading Japanese ports. Temporal trends are represented by fitted regression lines (with 95% confidence envelopes).
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f2-65_265: Time series analyses of the numbers of Brassica napus populations around 12 unloading Japanese ports. Temporal trends are represented by fitted regression lines (with 95% confidence envelopes).

Mentions: We found GMHT B. napus individuals in 414 populations (ca. 40%) of 1,029 around the 12 ports (Table 1). The proportion of populations containing GM individuals was high (>60%) in Chiba, Yokkaichi and Hakata. In other ports, the proportion was <30%, and zero in the ports of Osaka and Tobata (Table 1). Our generalized linear model regression analyses of temporal trends in the populations (both GM and non-GM) around each port are depicted in Fig. 2. A positive temporal trend was detected for the ports of Tobata, Hakata, Uno, Osaka, Nagoya, Shimizu, Chiba and Kashima. We found negative trends for the ports of Mizushima, Kobe, Yokkaichi and Yokohama. The fitted slopes were never steep and the confidence envelopes were broad. We tested hypotheses postulating that the gradient of each slope was zero (with 95% confidence intervals); the hypotheses were not rejected for all ports except Tobata. Therefore, the populations showed no increase or decrease over 6 yr around all ports other than Tobata, where the temporal trend was positive. However, a single outlier value for 2011 was responsible for this positive trend in Tobata; since we found no correlated shifts in favorable environmental condition associated with the high value in 2011, we consider this data point to be incidental. Furthermore, the Tobata populations did not contain GMHT plants.


Long-term monitoring of feral genetically modified herbicide-tolerant Brassica napus populations around unloading Japanese ports.

Katsuta K, Matsuo K, Yoshimura Y, Ohsawa R - Breed. Sci. (2015)

Time series analyses of the numbers of Brassica napus populations around 12 unloading Japanese ports. Temporal trends are represented by fitted regression lines (with 95% confidence envelopes).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4482177&req=5

f2-65_265: Time series analyses of the numbers of Brassica napus populations around 12 unloading Japanese ports. Temporal trends are represented by fitted regression lines (with 95% confidence envelopes).
Mentions: We found GMHT B. napus individuals in 414 populations (ca. 40%) of 1,029 around the 12 ports (Table 1). The proportion of populations containing GM individuals was high (>60%) in Chiba, Yokkaichi and Hakata. In other ports, the proportion was <30%, and zero in the ports of Osaka and Tobata (Table 1). Our generalized linear model regression analyses of temporal trends in the populations (both GM and non-GM) around each port are depicted in Fig. 2. A positive temporal trend was detected for the ports of Tobata, Hakata, Uno, Osaka, Nagoya, Shimizu, Chiba and Kashima. We found negative trends for the ports of Mizushima, Kobe, Yokkaichi and Yokohama. The fitted slopes were never steep and the confidence envelopes were broad. We tested hypotheses postulating that the gradient of each slope was zero (with 95% confidence intervals); the hypotheses were not rejected for all ports except Tobata. Therefore, the populations showed no increase or decrease over 6 yr around all ports other than Tobata, where the temporal trend was positive. However, a single outlier value for 2011 was responsible for this positive trend in Tobata; since we found no correlated shifts in favorable environmental condition associated with the high value in 2011, we consider this data point to be incidental. Furthermore, the Tobata populations did not contain GMHT plants.

Bottom Line: Genetically modified, herbicide-tolerant (GMHT) Brassica napus plants originating from seed spill have recently been found along roadsides leading from Japanese ports that unload oilseed rape.GMHT B. napus was found around 10 of 12 ports, but its proportion in the populations varied greatly by year and location.Furthermore, we found no herbicide tolerant B. juncea and B. rapa plants derived from crosses with GMHT B. napus.

View Article: PubMed Central - PubMed

Affiliation: Food Safety and Consumer Affairs Bureau, Ministry of Agriculture, Forestry and Fisheries of Japan , Kasumigaseki, Tokyo 100-8950 , Japan.

ABSTRACT
Genetically modified, herbicide-tolerant (GMHT) Brassica napus plants originating from seed spill have recently been found along roadsides leading from Japanese ports that unload oilseed rape. Such introductions have potential biodiversity effects (as defined by the Cartagena Protocol): these include replacement of native elements in the biota through competitive suppression or hybridization. We conducted surveys in the period 2006-2011 to assess such threats. We examined shifts in the population distribution and occurrence of GMHT plants in 1,029 volunteer introduced assemblages of B. napus, 1,169 of B. juncea, and 184 of B. rapa around 12 ports. GMHT B. napus was found around 10 of 12 ports, but its proportion in the populations varied greatly by year and location. Over the survey period, the distributions of a pure non-GMHT population around Tobata and a pure GMHT population around Hakata increased significantly. However, there was no common trend of population expansion or contraction around the 12 ports. Furthermore, we found no herbicide tolerant B. juncea and B. rapa plants derived from crosses with GMHT B. napus. Therefore, GMHT B. napus is not invading native vegetation surrounding its populations and not likely to cross with congeners in Japanese environment.

No MeSH data available.


Related in: MedlinePlus