久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

您現在的位置: Language Tips> Audio & Video> Special Speed News  
   
 





 
Learning the secrets of the potato, and an enemy
[ 2009-10-20 15:56 ]

 

Get Flash Player

Download

This is the VOA Special English Agriculture Report.

Scientists now have a genetic map of the potato. The project is the work of a team from 14 countries, the Potato Genome Sequencing Consortium.

Potatoes are one of the world's leading food crops. But potato breeders currently spend 10 to 12 years developing new kinds. Now they will be able to locate genes for any desired trait, improving quality, nutritional value and disease resistance.

Learning the secrets of the potato, and an enemy

A genome contains information about every position along chromosomes, the structures that hold genes. Genes direct the making of proteins which do much of the work in building an organism, whether a person or a potato. A potato has 12 chromosomes and about 840 million base pairs. This is about one-fourth the size of the human genome.

The potato genome is not yet final but it shows the order of 95 percent of the genes. Most potato varieties carry four separate copies of their genes. But the researchers did much of their work with a phureja, a kind of a potato that has only one copy. Richard Veilleux, a professor at Virginia Tech, provided that variety of potato.

Plant biologist Robin Buell at Michigan State University also worked on the genome. She says it will improve understanding of other crops because potatoes are related to tomatoes, peppers and eggplants.

In a separate development, another team reported completing a genome of the organism responsible for late blight. That disease can infect potatoes, tomatoes and some other plants. It causes several billion dollars a year in agricultural losses around the world.

But late blight was also the cause of the potato famine in Ireland in the middle of the 1800s. Potato shortages caused at least one million deaths and a wave of Irish immigration to America.

The scientists say that in the short term, studies based on the new genome may help explain why the pathogen has been so aggressive. And in the long term, they say, knowing where different genetic traits may be found on the map could lead to better plants. It could also reduce the need for chemicals.

Completion of the project was announced in the journal Nature. Researchers at Harvard University and the Massachusetts Institute of Technology led the work.

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

genome: the full complement of genetic material within an organism 基因組

consortium: an association or society 聯盟

chromosome: a circular strand of DNA in bacteria that contains the hereditary information necessary for cell life 染色體

pathogen: an agent that causes disease, especially a living microorganism such as a bacterium or fungus 病原體

Related stories:

Farmers organize to try to control potato supply

Researchers link gene to need for less sleep

Genome sequence could bring woolly mammoth back to life

Fat cell gene linked to colon cancer

Scientists link gene changes to longer lives

(Source: VOA 英語點津編輯)

 

英語點津版權說明:凡注明來源為“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。
相關文章 Related Story
 
 
 
本頻道最新推薦
 
主賓國 guest of honor
Make a big stink 大吵大鬧
Balloon boy hoax may have "conspirators"
健康:急救
拆遷費 relocation compensation
翻吧推薦
 
論壇熱貼
 
翻譯達人評選,快來投票!
經典英語口語,不得不看(推薦)
I chocolate you!怎么翻譯?
請教obama演講里的一句話
 
曬曬小D機器人暴強的翻譯

 

久久久无码人妻精品无码_6080YYY午夜理论片中无码_性无码专区_无码人妻品一区二区三区精99

    欧美日韩一区二区电影| 日韩一区二区精品| 亚洲视频香蕉人妖| caoporn国产精品| 国产精品久99| 97久久久精品综合88久久| 亚洲女爱视频在线| 99国产欧美另类久久久精品| 中文字幕在线观看一区| 色哦色哦哦色天天综合| 亚洲少妇中出一区| 欧美亚洲动漫另类| 日日夜夜一区二区| 欧美日韩在线综合| 男女男精品视频| 欧美精品一区二区在线播放| 久久99精品一区二区三区| 久久久亚洲综合| 成人免费三级在线| 亚洲精品成人精品456| 在线观看91精品国产麻豆| 久久超碰97人人做人人爱| 日韩写真欧美这视频| 激情久久久久久久久久久久久久久久| 久久久噜噜噜久久中文字幕色伊伊| 国产成人免费高清| 一区二区三区精品| 日韩三级在线免费观看| 国产精品18久久久久久久久 | 岛国一区二区在线观看| 久久久久久**毛片大全| 成人妖精视频yjsp地址| 亚洲欧美综合在线精品| 欧美日韩成人综合在线一区二区| 久久超碰97中文字幕| 国产日产精品一区| av不卡免费在线观看| 性做久久久久久免费观看欧美| 欧美成人午夜电影| av在线不卡网| 性做久久久久久| 国产婷婷精品av在线| 欧美丝袜丝交足nylons| 国产美女一区二区三区| 亚洲精品国产无天堂网2021| 日韩一级片网址| 99久久免费视频.com| 日韩中文字幕区一区有砖一区| 久久精品视频一区二区三区| 欧美特级限制片免费在线观看| 欧美日韩亚洲综合一区 | 亚洲男人的天堂网| 337p日本欧洲亚洲大胆色噜噜| 色网站国产精品| 国产成人精品www牛牛影视| 日韩国产精品久久久久久亚洲| 中文字幕一区二区三区四区| 精品理论电影在线| 欧美精品xxxxbbbb| 日本精品视频一区二区三区| 国产成人精品三级麻豆| 久久激情五月婷婷| 亚洲va中文字幕| 一区二区三区四区不卡在线 | 欧美在线你懂得| yourporn久久国产精品| 久久66热re国产| 日日嗨av一区二区三区四区| 亚洲人成精品久久久久久| 国产女主播一区| 精品国产一区二区三区av性色| 欧美肥大bbwbbw高潮| 欧美专区亚洲专区| 91日韩精品一区| 不卡视频一二三| 国产成人精品免费视频网站| 狠狠色综合日日| 麻豆成人久久精品二区三区红| 五月天一区二区| 亚洲图片欧美综合| 亚洲乱码日产精品bd| 亚洲欧洲日韩在线| 中文字幕av不卡| 欧美激情一区在线观看| 久久精品人人做人人综合 | 色哟哟国产精品免费观看| 成人动漫视频在线| 粉嫩久久99精品久久久久久夜| 国产乱国产乱300精品| 国内精品第一页| 国产在线一区观看| 国产综合色在线| 国内精品伊人久久久久av影院| 久久超级碰视频| 九九**精品视频免费播放| 日本亚洲电影天堂| 日韩电影一二三区| 青青草97国产精品免费观看无弹窗版| 日韩精品91亚洲二区在线观看| 午夜精品一区二区三区免费视频| 亚洲一区二区三区四区在线免费观看 | 日本欧洲一区二区| 青娱乐精品在线视频| 免费久久精品视频| 精品中文字幕一区二区| 精东粉嫩av免费一区二区三区| 久久精品国产久精国产爱| 久久91精品国产91久久小草| 国产一区二区在线免费观看| 国产精品一区2区| 国产69精品一区二区亚洲孕妇| 成人精品电影在线观看| 99麻豆久久久国产精品免费优播| 91美女蜜桃在线| 欧美色视频在线| 欧美一区二区三区免费观看视频| 日韩久久久精品| 久久久精品国产免费观看同学| 中文字幕不卡在线观看| 亚洲视频1区2区| 亚州成人在线电影| 久久se精品一区精品二区| 国产伦精品一区二区三区视频青涩 | 国产一区二区在线看| 盗摄精品av一区二区三区| 91在线国内视频| 欧美日韩免费一区二区三区| 日韩欧美中文一区| 久久精品水蜜桃av综合天堂| 日韩美女视频一区| 视频一区中文字幕| 韩国一区二区三区| 成人sese在线| 欧美视频一区在线观看| 日韩美女视频在线| 国产精品久久久久一区| 亚洲一线二线三线久久久| 日韩国产精品91| 国产不卡一区视频| 欧美影视一区二区三区| 日韩一级高清毛片| 中文av一区二区| 亚洲一区二三区| 黑人巨大精品欧美一区| 不卡一区中文字幕| 欧美日韩国产免费一区二区| 精品国产乱码久久久久久1区2区| 国产精品第四页| 日韩制服丝袜先锋影音| 国产精品小仙女| 在线观看视频一区| 26uuu国产日韩综合| 亚洲人成电影网站色mp4| 男女性色大片免费观看一区二区| 福利一区二区在线观看| 欧美日韩中文字幕一区| 国产日韩视频一区二区三区| 亚洲国产精品一区二区久久恐怖片 | 欧美在线观看视频一区二区| 日韩欧美一区二区三区在线| 国产精品色呦呦| 日韩激情在线观看| 成人av午夜电影| 337p亚洲精品色噜噜| 国产日韩欧美麻豆| 午夜私人影院久久久久| 成人污污视频在线观看| 在线成人免费视频| 国产精品久久久久一区二区三区| 日本欧美加勒比视频| 99精品国产视频| 精品久久99ma| 亚洲宅男天堂在线观看无病毒| 精品午夜久久福利影院| 欧美色中文字幕| 中文字幕永久在线不卡| 捆绑紧缚一区二区三区视频 | 精品久久久影院| 亚洲制服欧美中文字幕中文字幕| 国产精品一区二区在线观看不卡| 欧美三级视频在线| 国产精品拍天天在线| 另类小说综合欧美亚洲| 欧美色网一区二区| 一区在线播放视频| 国产一区二区在线观看视频| 欧美精品1区2区3区| 亚洲人123区| 豆国产96在线|亚洲| 欧美不卡一区二区三区| 香蕉乱码成人久久天堂爱免费| 99精品视频在线免费观看| 久久夜色精品一区| 免费欧美高清视频| 欧美色网一区二区| 一区二区三区在线免费视频| 丁香激情综合五月| 国产亚洲美州欧州综合国| 精品一区二区在线免费观看| 欧美精品xxxxbbbb|