• Instead,they mated hundreds of varieties of rice.

    VOA: special.2011.02.22

  • Since the 19th century it has systematically collected all varieties of fossilized skeletons.

    VOA: standard.2009.12.08

  • Helping breeders quickly develop better varieties of all these crops will be crucial as the world population tops 9 billion by 2050 in the face of a changing climate.

    VOA: standard.2010.02.01

  • In 1944,when many experts warned of mass starvation in developing nations where populations were expanding faster than crop production, Borlaug began work at a Rockefeller Foundation-funded project in Mexico to increase wheat production by developing higher-yielding varieties of the crop.

    VOA: standard.2009.09.13

  • "And so once we understand the genetics, we can try and just take those particular genes and work with popular varieties of rice to cross those particular genes into a popular variety and still maintain the expected cooking and eating qualities of the grain."

    VOA: standard.2010.06.25

  • Most potato varieties carry four separate copies of their genes.

    VOA: special.2009.11.03

  • "This is a new strain of stem rust organism that has the power to destroy most of the wheat varieties being grown around the world."

    VOA: standard.2009.09.16

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