Fitness and maternal effects in hybrids formed between transgenic oilseed rape (Brassica napus L.) and wild brown mustard [B. juncea (L.) Czern et Coss.] in the field

Kun, Di; Stewart, C. Neal; Wei, Wei; Shen, Baocheng; Tang, Zhen‐Xing; Ma, Keping

doi:10.1002/ps.1749

Cited by 36 publications

(32 citation statements)

References 42 publications

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“…Di et al (2009) reported that the F 1 hybrid from wild B. juncea × transgenic canola showed higher fertility than found in our study (Table 1) and reported previously (Bing et al 1996, Frello et al 1995). Di et al (2009) also discussed that vigorous vegetative and reproductive growth of wild B. juncea allowed the maintenance of higher fertility in F 1 hybrid.…”

Section: Discussionsupporting

confidence: 69%

“…Di et al (2009) also discussed that vigorous vegetative and reproductive growth of wild B. juncea allowed the maintenance of higher fertility in F 1 hybrid. Given that wild B. juncea in natural environments is thought to comprise multiple genotypes, a discussion of introgression potential should also take into account this genotypic variation.…”

Section: Discussionmentioning

confidence: 99%

“…B. juncea (AABB, 2n = 36) is cultivated and is also found as a weed and feral plant in Japan (Shimizu et al 2003), Asian countries including China (Di et al 2009), Europe (Hultén and Fries 1986), Australia (OGTR 2011), Canada and the USA (Bryson and DeFelice 2010). Since B. juncea is considered the second most likely species after B. rapa to be a recipient of B. napus genes by virtue of their crossability and weediness (Di et al 2009, OGTR 2011, Scheffler and Dale 1994), the risk assessment regarding introgression from B. napus to B. juncea should be carried out carefully.…”

Section: Introductionmentioning

confidence: 99%

“…Since B. juncea is considered the second most likely species after B. rapa to be a recipient of B. napus genes by virtue of their crossability and weediness (Di et al 2009, OGTR 2011, Scheffler and Dale 1994), the risk assessment regarding introgression from B. napus to B. juncea should be carried out carefully. Therefore, persistence of chromosome derived from B. napus should be investigated in hybrid progenies.…”

Section: Introductionmentioning

confidence: 99%

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Persistent C genome chromosome regions identified by SSR analysis in backcross progenies between Brassica juncea and B. napus

et al. 2012

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Given that feral transgenic canola (Brassica napus) from spilled seeds has been found outside of farmer’s fields and that B. juncea is distributed worldwide, it is possible that introgression to B. juncea from B. napus has occurred. To investigate such introgression, we characterized the persistence of B. napus C genome chromosome (C-chromosome) regions in backcross progenies by B. napus C-chromosome specific simple sequence repeat (SSR) markers. We produced backcross progenies from B. juncea and F1 hybrid of B. juncea × B. napus to evaluate persistence of C-chromosome region, and screened 83 markers from a set of reported C-chromosome specific SSR markers. Eighty-five percent of the SSR markers were deleted in the BC1 obtained from B. juncea × F1 hybrid, and this BC1 exhibited a plant type like that of B. juncea. Most markers were deleted in BC2 and BC3 plants, with only two markers persisting in the BC3. These results indicate a small possibility of persistence of C-chromosome regions in our backcross progenies. Knowledge about the persistence of B. napus C-chromosome regions in backcross progenies may contribute to shed light on gene introgression.

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Section: Discussionsupporting

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Persistent C genome chromosome regions identified by SSR analysis in backcross progenies between Brassica juncea and B. napus

et al. 2012

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“…It is noteworthy that this potential evolution in flowering time does not depend on the presence of the Bt transgene in the crop, and may even be counter-balanced by positive selection acting on the transgene if the latter was positively associated with maternal genes promoting late flowering and long flowering periods. Recent experiments indeed indicate that the Bt transgene does not induce any fitness costs in hybrids between transgenic B. napus and weedy relatives [37], [38]. It may therefore convey a selective advantage under insect herbivore pressure [39].…”

Section: Discussionmentioning

confidence: 99%

Impact of Interspecific Hybridization between Crops and Weedy Relatives on the Evolution of Flowering Time in Weedy Phenotypes

et al. 2011

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BackgroundLike conventional crops, some GM cultivars may readily hybridize with their wild or weedy relatives. The progressive introgression of transgenes into wild or weedy populations thus appears inevitable, and we are now faced with the challenge of determining the possible evolutionary effects of these transgenes. The aim of this study was to gain insight into the impact of interspecific hybridization between transgenic plants and weedy relatives on the evolution of the weedy phenotype.Methodology/Principal FindingsExperimental populations of weedy birdseed rape (Brassica rapa) and transgenic rapeseed (B. napus) were grown under glasshouse conditions. Hybridization opportunities with transgenic plants and phenotypic traits (including phenological, morphological and reproductive traits) were measured for each weedy individual. We show that weedy individuals that flowered later and for longer periods were more likely to receive transgenic pollen from crops and weed×crop hybrids. Because stem diameter is correlated with flowering time, plants with wider stems were also more likely to be pollinated by transgenic plants. We also show that the weedy plants with the highest probability of hybridization had the lowest fecundity.Conclusion/SignificanceOur results suggest that weeds flowering late and for long periods are less fit because they have a higher probability of hybridizing with crops or weed×crop hybrids. This may result in counter-selection against this subset of weed phenotypes, and a shorter earlier flowering period. It is noteworthy that this potential evolution in flowering time does not depend on the presence of the transgene in the crop. Evolution in flowering time may even be counter-balanced by positive selection acting on the transgene if the latter was positively associated with maternal genes promoting late flowering and long flowering periods. Unfortunately, we could not verify this association in the present experiment.

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Assessment and Detection of Gene Flow

Wei

Kwit

Millwood

et al. 2012

Plant Gene Containment

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Fitness and maternal effects in hybrids formed between transgenic oilseed rape (Brassica napus L.) and wild brown mustard [B. juncea (L.) Czern et Coss.] in the field

Cited by 36 publications

References 42 publications

Persistent C genome chromosome regions identified by SSR analysis in backcross progenies between <i>Brassica juncea</i> and <i>B. napus</i>

Persistent C genome chromosome regions identified by SSR analysis in backcross progenies between <i>Brassica juncea</i> and <i>B. napus</i>

Impact of Interspecific Hybridization between Crops and Weedy Relatives on the Evolution of Flowering Time in Weedy Phenotypes

Assessment and Detection of Gene Flow

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