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During the 1960s Bennett worked at the (now-defunct) Scottish Plant Breeding Station, where she studied micro-evolution and the origins of genetic diversity, with a focus on forage and seed crops.
During the 1960s Bennett worked at the (now-defunct) Scottish Plant Breeding Station, where she studied micro-evolution and the origins of genetic diversity, with a focus on forage and seed crops.
She was one of the first to raise the issue of biodiversity loss at the United Nations. Her work included expeditions around the world to collect plant samples. In 1964 she wrote the internationally influential paper “Plant Introduction and Genetic Conservation: Genecological aspects of an urgent world problem”.
In it, she coined the term "genetic resources" to express the idea that genes themselves are a resource - one that has been disappearing rapidly, as diverse traditional peasant seeds have been replaced by uniform modern, elite seeds.
In traditional, peasant crop varieties, or landraces, each plant is a bit different from the others, and this genetic diversity means that when new plant diseases or pests appear, at least some of the plants will likely be resistant. By contrast, in modern pedigree or elite crop varieties each plant is the same, and while these elite crops are often high-yielding, their lack of genetic diversity makes them particularly vulnerable to attacks by new strains of disease.
When an elite variety stops giving acceptably high yields due to disease, or some other factor, the plant breeders turn to the traditional varieties, or even to wild relatives, in search of genes that can confer the necessary resistance. Bennett work at the United Nations Food and Agriculture Organisation from 1967 to 1982.
Bennett was one of the founding board members of RAFI, which later became the ETC Group.