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Hints:
specimen
forensic

Lyndel Meinhardt: There are a lot of threats out there that could severely impact the availability of chocolate.

You're listening to Lyndel Meinhardt, a plant pathologist with the U.S. Department of Agriculture.[---1---] ---Witch’s Broom(叢枝病).

Lyndel Meinhardt: [---2---]

Meinhardt and his team have been looking for wild cacao near the Amazon River in South America. [---3---]

Lyndel Meinhardt: [---4---]

[---5-6---]

Lyndel Meinhardt: [---7-8---]

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ES, a clear voice for science. We’re at Es. Org.

【視聽(tīng)版科學(xué)小組榮譽(yù)出品】
Meinhardt said cacao, the plant used to make chocolate, is highly susceptible to diseases like the fungals We're looking for trees that show no symptoms or no signs of the disease or they have a large production with the disease. They're collecting specimens of the ancestors of domesticated cacao, still growing in nature. That material can then be utilized by those nations to try to work toward improving the existing varieties of cacao. Climate change models predict more extreme weather in this century. If it comes, Meinhardt said, unknown varieties of plants could hold genetic keys to drought, or disease-resistant crops. We have a set of DNA markers similar to what you might use in forensics medicine where they can actually identify individuals in the population. we have similar markers for the trees. Scientists like Meinhardt believe it's urgent to find and preserve the wild relatives of our food crops, to help secure global food supply.