ITHACA, N.Y. With fewer than a dozen flowering plants out of 300,000 species accounting for 80 percent of humanity's caloric intake, people need to tap unused plants to feed the world in the near future, claims Cornell University plant geneticist Susan McCouch in the Comment feature of the July 4 issue of Nature.
To keep pace with population growth and rising incomes around the world, researchers estimate that food availability must double in the next 25 years. The biodiversity stored in plant gene banks coupled with advances in genetics and plant breeding may hold the keys for meeting the demands of more food in the face of climate change, soil degradation and water and land shortages, according to the paper.
"Gene banks hold hundreds of thousands of seeds and tissue culture materials collected from farmer's fields and from wild, ancestral populations, providing the raw material that plant breeders need to create crops of the future," said McCouch.
For example, after screening more than 6,000 varieties from seed banks, plant breeders identified and crossbred a single wild species of rice, Oryza nivara; the result is a variety that has protected against grassy stunt virus disease in almost all tropical rice varieties in Asia for the past 36 years, the paper states. Similarly, by 1997, the value of using crop wild relatives as sources of environmental resilience and resistance to pests and diseases led to an estimated $115 billion in annual benefits to the world economy.
Though seeds are readily accessible in 1,700 gene banks throughout the world, "they are not used to their full potential in plant breeding," McCouch said.
At present, it is difficult for breeders to make use of the wealth of genetic material in seed banks because of a lack of information about the genes in most plants and the traits they confer, she said. Due to the time and effort required to identify and then use wild and unadapted genetic r
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