日韩精品久久一区二区三区_亚洲色图p_亚洲综合在线最大成人_国产中出在线观看_日韩免费_亚洲综合在线一区

English 中文網 漫畫網 愛新聞iNews 翻譯論壇
中國網站品牌欄目(頻道)
當前位置: Language Tips> Audio & Video> 新聞播報> Special Speed News VOA慢速

Mapping the way to a better soybean

[ 2010-02-03 14:05]     字號 [] [] []  
免費訂閱30天China Daily雙語新聞手機報:移動用戶編輯短信CD至106580009009

This is the VOA Special English Agriculture Report.

Soybeans are eaten by people and fed to animals. Some farmers grow them to replace lost nitrogen in the soil.

Soybeans were first grown in Asia thousands of years ago. Now scientists have a full genetic map of the soybean. This is the first genome completed for a member of the legume family.

Mapping the way to a better soybean

The genome will make it easier to target different qualities and develop improved crops. Sequencing the genes, organizing all of them in order, will save many hours of searching. It will make it easier to search for what each gene is responsible for.

A report on the genome appeared last week in the journal Nature.

Scott Jackson at Purdue University in West Lafayette, Indiana, helped lead the study team. He says the kind of soybeans they studied have 46,000 genes. Between 70 and 80 percent of them, however, are copies of other genes.

Some genes change or disappear over time. But Professor Jackson explains that soybeans have kept copies of most their genes. This is fairly unusual for plants, he says, and extremely unusual for animals.

Genes are organized along chromosomes. These contain molecules of DNA, the building blocks of life.

The researchers found that the sets of chromosomes in soybeans have copied themselves at least twice. It happened almost 60 million years ago and again 13 million years ago.

Over time, genes develop changes, known as mutations. Scientists can tell when these changes happened. The number of mutations over time helped the team estimate when the duplications in soybeans took place.

The genome could help genetic engineers develop soybeans that are processed better by farm animals. Soybeans contain chemicals called phytates. These prevent the absorption of phosphorus in the diet.

Pigs and chickens especially are affected. Undigested phosphorus in their waste can pollute water supplies.

Genetic engineering has already reduced phytates in soybeans. Now with the gene map there could be further reductions.

The genome could also help farmers avoid Asian soybean rust disease, a highly destructive fungus spread by the wind. The researchers say they found a gene for resistance to this disease. Now they have to find a way to use it.

And that's the VOA Special English Agriculture Report, written by Jerilyn Watson. You can find transcripts, MP3s and captioned videos of our reports at voaspecialenglish.com. I'm Bob Doughty.

legume: any plant that has seeds in long pods. Peas and beans are legumes 豆科作物

chromosome: one of the very small parts like threads in the nuclei(= central parts) of animal and plant cells, that carry the genes 染色體

phytate: 植酸鹽

phosphorus: a chemical element found in several different forms, including as a poisonous, pale yellow substance that shines in the dark and starts to burn as soon as it is placed in air 磷

Related stories:

New understanding of how plants use water

Keeping plants and trees warm when temperatures drop

New alliance to study greenhouse gases in agriculture

Solar-powered pumps aid African farmers

(來源:VOA 編輯:陳丹妮)

 
中國日報網英語點津版權說明:凡注明來源為“中國日報網英語點津:XXX(署名)”的原創作品,除與中國日報網簽署英語點津內容授權協議的網站外,其他任何網站或單位未經允許不得非法盜鏈、轉載和使用,違者必究。如需使用,請與010-84883631聯系;凡本網注明“來源:XXX(非英語點津)”的作品,均轉載自其它媒體,目的在于傳播更多信息,其他媒體如需轉載,請與稿件來源方聯系,如產生任何問題與本網無關;本網所發布的歌曲、電影片段,版權歸原作者所有,僅供學習與研究,如果侵權,請提供版權證明,以便盡快刪除。
 

關注和訂閱

人氣排行

翻譯服務

中國日報網翻譯工作室

我們提供:媒體、文化、財經法律等專業領域的中英互譯服務
電話:010-84883468
郵件:[email protected]
 
 
主站蜘蛛池模板: 梦中人在线观看免费完整版 | 一区二区三区国模大胆 | 精品国产乱码一区二区三 | 欧美在线日韩 | va在线| 国产成人免费视频网站视频社区 | 国产精品婷婷午夜在线观看 | 国产日韩一区二区三区在线观看 | 欧美成视频在线观看 | 狠狠狠色丁香婷婷综合激情 | 人人狠狠综合88综合久久 | 国产精品午夜小视频观看 | 国产一区二区丁香婷婷 | 欧美一区二区在线播放 | 在线成人 | 天天天天操| 夜精品一区二区无码A片 | 久久伊人色综合 | 亚洲国产一区二区视频 | 欧美日韩精品一区二区三区四区 | 亚州 色毛片免费观看 | 成人在线免费视频观看 | 天天干天天操天天爽 | 中文字幕一区在线观看视频 | 欧美精品一区二区精品久久 | 欧美在线观看视频 | 黄色综合 | 色综合色狠狠天天综合色 | 日韩成人黄色片 | 国产欧美日韩视频 | 国产精品美女久久久久aⅴ国产馆 | 久久99精品热在线观看15 | www.在线播放 | 亚洲综合色婷婷在线观看 | 二区三区偷拍浴室洗澡视频 | 亚洲欧美日韩在线一区 | 国产成人免费全部网站 | 全黄性性激高免费视频 | 欧美日韩高清一区 | 九九99国产精品视频 | 天天综合国产 |