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Gene silencing plans make objectors shout louder Plans for new GM crop trial raise objections from leading environmental and farming organisations

Immediate release (16 Apr 2019)

Press contact Liz O'Neill on 07811 211 404, liz[at]

Thirty-one organisations including some of the UK’s biggest environmental organisations, farmers, scientists, seed distributors and retailers lodged a formal objection today to The Sainsbury Laboratory’s plans for a new open-air field trial of GM potatoes on farms in Suffolk and Cambridge.

The potatoes that scientists want to plant in open fields contain several different added genes that work in different ways to control different biological functions, but the application does not consider possible interactions between these stacked traits. GM Freeze Director Liz O’Neill believes that this simply isn’t good enough:

When a patient is prescribed more than one medication, their doctor and pharmacist consider the potential for interactions on a case by case basis. Here, a bunch of unrelated genes are being added to a staple food crop and assessed for safety on a simple ‘face value’ basis.

The proposed trial also uses gene silencing techniques to “switch off” the function of particular genes. Like all forms of genetic modification this can lead to off-target effects and unintended impacts. There is no agreed protocol for assessing the risk to people or animals who may accidentally or deliberately consume plants modified in this way [1] so the objection signatories are urging Environment Secretary Michael Gove to refuse permission for the trial. As they state in the objection itself:

The GM potato field trial should be refused on the grounds that the environmental risk assessment is incomplete and, importantly, cannot be completed at the current time because of the acknowledged gaps in scientific understanding regarding potential effects on non-target organisms.

Given the level of concern about the plants in the proposed trial, signatories to the objection have also raised a red flag over plans for ensuring that no genetically modified material remains in the soil after the trial has ended. As O’Neill comments@

The Sainsbury Lab propose monitoring the trial site for two years after harvesting the modified potatoes but anyone who has grown their own knows that potatoes can lie dormant in the soil for many years, popping up as a vigorous new plant just when you least expect it.

Objections to the proposed trial can be lodged with Defra until Easter Monday, 22 April. Details can be found at


For more information, please contact Liz O’Neill on 07811 211 404, liz[at]



GM Freeze is the UK umbrella campaign on GM food, crops and patents.

The Sainsbury Laboratory application and details of the statutory public consultation can be found at

The fully-referenced multi-agency response can be viewed at

Signatories to the objection are GM Freeze, EcoNexus, GeneWatch UK, GMWatch, OF&G (Organic Farmers and Growers), the Soil Association, the Organic Research Centre, Garden Organic, Biodynamic Association, WWOOF UK (World Wide Opportunities on Organic Farms), the Kindling Trust, Sheepdrove Organic Farm, Shepton Farm, the Real Seed Catalogue, Banc Hadau Llambed / Lampeter Seed Library, Unicorn Grocery, ACE Energy, the Springhead Trust, Beyond GM, Mums Say No to GMOs, GM Free Dorset, GM Free Somerset, GM Free Cymru, Genetic Engineering Network, Agri-Activism UK, South East Essex Organic Gardeners, Cardiff Friends of the Earth, East Dorset Friends of the Earth, West Dorset Friends of the Earth, Sustainable Dorset/Dorset Agenda 21 and Resurgence Dorset.



[1] The European Food Safety Authority (EFSA) has published a protocol for off-target bioinformatic searches in plants genetically modified by RNA-interference (RNAi) but not for the animals or humans who might ingest an RNAi-modified plant.


EFSA, 2017. Internal note on the strategy and technical aspects for small RNA plant off-target bioinformatics studies. In: Minutes of the 118th plenary meeting of the Scientific Panel on GMO, 25-26 October 2017, Annex II.;


Pačes, J., Nič, M. & Novotný, T. 2017. Literature review of baseline information to support the risk assessment of RNAi‐based GM plants. EFSA supporting publication 2017: EN-1246.