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Writing & Language

Some plant pathologists have turned to genetic engineering to devise new ways of responding to botanical diseases. Plant pathologist William Powell, for instance, teamed up with forest biologist Chuck Maynard to restore North America's population of American chestnut trees, which was decimated in the early 1900s by a fungus known as chestnut blight. A fungus, C. parasitica, contributes to the growth of cankers on the trees' trunks; these cankers, in turn, prevent a tree from transporting water from their roots to their branches and leaves. To render American chestnut trees resistant to the blight, Powell and Maynard experimented with altering the genetic makeup of the trees. The resultant genetically engineered trees are called Darling 4 American chestnut trees, and during the first 15 weeks after infection with chestnut blight, they grow cankers that are much smaller than those that grow on American chestnut trees.

A.NO CHANGE
B.trees
C.that tree
D.it

重点单词   查看全部解释    
population [.pɔpju'leiʃən]

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n. 人口 ,(全体)居民,人数

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genetically [dʒe'netikəli]

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adv. 遗传(基因)方面

 
resistant [ri'zistənt]

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adj. 抵抗的,反抗的
n. 抵抗者

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restore [ri'stɔ:]

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vt. 恢复,修复,使复原

 
devise [di'vaiz]

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vt. 设计,发明,遗赠给
n. 遗赠,

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fungus ['fʌŋgəs]

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n. 真菌,霉菌 (复数为funguses或fungi)

 
render ['rendə]

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vt. 使成为,提供,报答,着色; 执行,实施

 
prevent [pri'vent]

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v. 预防,防止

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genetic [dʒi'netik]

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adj. 基因的,遗传的,起源的

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infection [in'fekʃən]

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n. 传染,影响,传染病

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