On a fenced plot not far from Indian Prime Minister Narendra Modi's home, a field of mustard is in full yellow bloom, representing his government's reversal of an effective ban on field trials of genetically modified (GM) food crops.

The GM mustard planted in the half-acre field in the grounds of the Indian Agricultural Research Institute in New Delhi is in the final stage of trials before the variety is allowed to be sold commercially, and that could come within two years, scientists associated with the project say.

India placed a moratorium on GM eggplant in 2010 fearing the effect of genetic modification on food safety and biodiversity. Field trials of other GM crops were not formally halted, but the regulatory system was brought to a deadlock.