AGRICULTURE REPORT - Growing Wheat

（单词翻译）

AGRICULTURE REPORT
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January 15, 2002: Growing Wheat

By George Grow

This is the VOA Special English AGRICULTURE REPORT.

Studies show that there will be nine-thousand-million people in the world by the year Two -Thousand -Fifty. The
United Nations has warned that many countries will have to increase food production to satisfy their population
demands.

Some agriculture experts say increasing grain production on the world’s richest soils may not be enough. They
note that production of wheat also must be increased on less productive soils.

One concern is the growing amount of harmful metals in farmland soils. The metal
aluminum¹, for example, restricts growth of wheat plants when acid levels in the soil are
high. Aluminum particles are mainly found just below the topsoil.

Aluminum restricts plant growth on more than thirty percent of all farmland worldwide. In
the United States, almost thirty -five -million hectares of farmland are affected².

Adding another substance, lime, is one way to reduce the acidity³ of soils that have too
much aluminum. But lime is costly⁴ to transport long distances. Another method is to
develop plants strong enough to grow in such soils.

J. Perry Gustafson is a genetic⁶ expert with the Agricultural Research Service of the United States Agriculture
Department. He is helping⁷ plant growers develop new kinds of wheat plants with genes⁸ that will help the plants
grow in high-aluminum soils.
Mister Gustafson works with the Plant Genetics Research office in Columbia, Missouri. Scientists there have
been studying the genetic structure of wheat. They have identified the area of a gene⁵ that resists aluminum. They
say the aluminum-resistant gene is between two marker genes that are close to each other.

Wheat growers can now choose plants that have these markers. The Department of Agriculture say this process
may reduce by half the time required to develop a new kind of wheat. Currently, ten to fifteen years are
necessary.

The genetic marker was identified in a wheat plant native to Brazil. No other wheat grows as well in high-
aluminum soils.

Mister Gustafson says that borrowing genes from another grain, rye, may be the best hope for wheat to survive in
acidic, high-aluminum soils. He has found genetic markers in rye plants that are closely linked to the aluminum-
resistant genes. He hopes the markers can be used to help move the desirable rye genes into wheat.

This VOA Special English AGRICULTURE REPORT was written by George Grow.

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