生长于盐水中的西红柿问世

63 生长于盐水中的西红柿问世

AGRICULTURE REPORT September 4, 2001: Salt-Resistant TomatoBy George Grow

（Start at 1'03" ）This is Bill White with the VOA Special English Agriculture Report.
Scientists have produced the first (1)tomato that can grow in salty water. Salty water is generally harmful to plants. Plant expert Eduardo Blumwald and his team found a way to direct salt away from the (2)fruit of tomato plants. Mister Blumwald works at the University of California at Davis. The tomatoes were grown at the University of Toronto in Ontario, Canada. The publication Nature (3)Biotechnology reported the findings. Mister Blumwald says the (4)discovery will be important for agriculture around the world.
Farmers use (5)irrigation to water land by other than natural methods. It helps farmers in areas that have long periods of little or no (6)rainfall.
Crop irrigation also increases the salt levels of soils and water. It leaves (7)sodium, (8)calcium, (9)magnesium and other chemicals in the farm land. The chemicals come from the soils and rock that the water passes through. With time, they decrease the productivity² of the land.
Experts at the University of California report that high levels of salt from irrigation have damaged about forty percent of the world's farmland. American officials estimate that irrigation-produced salt is responsible for the loss of ten-million hectares of farmland worldwide each year.
Many areas treated with irrigated³ water are so salty that some crops can no longer grow. Salty water harms the ability of most plants to take in water through their root cells. The flow of water into the plant may stop if salt levels in the soil are very high.
Mister Blumwald's team used genetic⁴ engineering to stop this effect. The scientists gave their tomato plants a (10)gene¹ from the Arabidopsis plant. The gene controls the production of a (11)transport protein.
The transport protein uses energy in cells to move salt into areas within cells called vacuoles. When the salt is inside (12)vacuoles it cannot (13)interfere with the plant's normal biochemical activity. The salt-storing activity takes place only in the leaves of the tomato plants. So the tomato fruit is not harmed.
The researchers say these tomato plants also removed salt from the soil. The scientists said the plants grew and produced fruit in water fifty times saltier than normal. Experts say these tomatoes offer hope that other crops can be genetically⁵ engineered to grow in areas of the world that have salty irrigation water and salt-damaged soil.
This VOA Special English AGRICULTURE REPORT was written by George Grow.

 

(1) tomato[ tE5mB:tEu, tE5meitEu ]n.番茄, 西红柿
(2) fruit[ fru:t ]n.水果, 果实, 果类, 成果vi.结果实
(3) biotechnology[ 7baiEutek5nClEdVi ]n.生物工艺学
(4) discovery[ dis5kQvEri ]n.发现, 发明的东西
(5) irrigation[ 7iri5^eiFEn ]n.灌溉, 冲洗
(6) rainfall[ 5reinfC:l ]n.降雨, 降雨量
(7) sodium[ 5sEudjEm, -diEm ]n.[化] 钠
(8) calcium[ 5kAlsiEm ]n.[化]钙(元素符号Ca)
(9) magnesium[ mA^5ni:zjEm ]n.[化]镁
(10) gene[ dVi:n ]n.[遗传]因子, [遗传]基因
(11) transport[ trAns5pC:t ]n.传送器, 运输, 运输机, 激动, 流放犯, 狂喜vt.传送, 运输, 流放, 放逐
(12) vacuole[ 5vAkjuEul ]n.空泡, [生]液泡
(13) interfere[ 7intE5fiE ]vi.干涉, 干预, 妨碍, 打扰

1 gene   

n.遗传因子，基因

参考例句：

• A single gene may have many effects.单一基因可能具有很多种效应。
• The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。

2 productivity   

n.生产力，生产率，多产

参考例句：

• Farmers are introducing in novations which increase the productivity.农民们正引进提高生产力的新方法。
• The workers try to put up productivity.工人设法提高生产率。

3 irrigated   

[医]冲洗的

参考例句：

• They irrigated their crops with water from this river. 他们用这条小河里的水浇庄稼。
• A crop can be sown, weeded, irrigated, and fertilized uniformly. 一种作物可以均匀一致地进行播种，除草，灌溉和施肥。

4 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

5 genetically   

adv.遗传上

参考例句：

• All the bees in the colony are genetically related. 同一群体的蜜蜂都有亲缘关系。
• Genetically modified foods have already arrived on American dinner tables. 经基因改造加工过的食物已端上了美国人的餐桌。 来自英汉非文学 - 生命科学 - 基因与食物