Growth behavior and competitive ability of transgenic crops

Fredshavn, Jesper; Poulsen, Gitte Silberg

doi:10.1016/0378-4290(95)00054-2

Cited by 15 publications

(15 citation statements)

References 11 publications

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“…However, some interaction between the Ogura male sterile cytoplasm and the hoary mustard nuclear genome cannot be discounted, but is considered to be unlikely since no effect had been detected in other work with the same cytoplasm (de Melo & Giordano 1994 the hybrid never appeared with lower competitive ability than hoary mustard. A similar trend has recently been found for hybrids between sugar beet and wild sea beet (Fredshavn & Poulsen 1995) and between weedy and cultivated radishes (Klinger & Ellstrand 1994). …”

Section: Discussionsupporting

confidence: 51%

Gene Dispersal from Transgenic Crops. I. Growth of Interspecific Hybrids Between Oilseed Rape and the Wild Hoary Mustard

Lefol¹,

Danielou²,

Darmency³

et al. 1995

The Journal of Applied Ecology

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Section: Discussionsupporting

confidence: 51%

Gene Dispersal from Transgenic Crops. I. Growth of Interspecific Hybrids Between Oilseed Rape and the Wild Hoary Mustard

Lefol¹,

Danielou²,

Darmency³

et al. 1995

The Journal of Applied Ecology

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“…HR râpe displayed equal or less invasiveness than its non-transformed counterparts; this was not altogether surprising given the absence of herbicide sélective pressure in the expéri-mental design. Similar results were obtained by Fredshaven and Poulsen (1996) in Denmark and Belgium for transgenic glufosinate-resistant B. napus lines and transgenic glyphosateresistant sugar beet in compétitive field trials in the absence of herbicide sélec-tion pressure. Transgenic glufosinateresistant and non-transgenic lines of B. napus had differing fitness, however, when compared in four différent habitats in each of three climate régimes in the UK (Hails et al 1997).…”

Section: Fitnesssupporting

confidence: 74%

Transgenic crops : new weed problems for Canada?

Warwick¹,

Beckie²,

Small³

2005

phyto

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Over 25 000 transgenic field trials were conducted globally from 1986-1997, and many transgenic crops, including soybean (Glycine max), maize (Zea mays), tobacco (Nicotiana tabaccum), cotton (Gossypium hirsutum), canola (Brassica napus, B. rapa), tomato (Lycopersicon esculentum) and potato (Solarium tuberosum) have been commercially released. There has been a high adoption rate, with at least 28 million ha reported for 1998, with herbicide- and insect-resistant plants occupying 71 and 28% of the releases, respectively. The current status of commercial production of transgenic crops in Canada is summarized. Transgenic crops have the potential to change weed communities/populations in three principal ways, via: 1 ) escape and proliferation of the transgenic plants as 'weedy' volunteers with subsequent displacement of the crop, weed and/or natural vegetation; 2) hybridization with and transgene infiltration into related weedy and/or wild species, resulting in invigorated weeds and/or alteration of natural gene frequencies in these species; and 3) genetic changes in populations of unrelated species, as a result of changes to the environment, in particular herbicide-resistant (HR) transgenic crops and the development of HR weeds. Potential risk can be estimated a priori using knowledge of the systematics of crop/wild/weed complexes. Risk must be assessed on a case-by-case basis for each crop, each country/ecological region, and for each trait. Potential weed risks will be greater if crop volunteers are predisposed to becoming weedy, are well adapted to the Canadian climate and if sexually compatible wild species are present.

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“…However, this did not translate into increased competitiveness or`weediness' of OSR under the conditions of their study (Stewart et al 1997). Other studies have shown that transgenic sugar beet and OSR did not dier in their competitiveness compared with non-transgenic controls (Fredshavn et al 1995, Fredshavn andPoulsen 1996). Work by Norris et al (1999) indicated that weediness and invasiveness of herbicide-tolerant and high laurate OSR was not enhanced by the presence of the transgenes, con®rming previous reports (Booth et al 1996, Sweet et al 1997, Crawley et al 1993).…”

Section: Ecological Competitiveness Of Transgenic Oilseed Rapesupporting

confidence: 70%