www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

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

New understanding of how plants use water

[ 2010-01-27 11:18]     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.

Scientists have discovered more details about how plants use water. Their findings could help to engineer plants that grow better and more effectively in conditions with higher levels of carbon dioxide.

Plants naturally take in carbon dioxide they need for photosynthesis, the process of changing light energy to chemical energy. The carbon dioxide enters the plants through tiny holes or pores on the surface of leaves.

New understanding of how plants use water

However, each time a plant takes in one molecule of carbon dioxide gas, it loses hundreds of water molecules.

Scientists say plants lose 95 percent of the water they take in through these pores. Some plants' pores can tighten to save water during conditions of high carbon dioxide. Other plants are not able to do this as well. Now, scientists know how these tiny pores tighten in plants.

Julian Schroeder is a professor of biology at the University of California, San Diego. Mr. Schroeder says that carbon dioxide levels in the atmosphere are much higher now than they were in the past. However, he says, many plants are not closing their pores in order to hold in more water.

He and his team have identified proteins that control the tightening of a plant's pores. The proteins areenzymes called carbonic anhydrases. The findings were published last month in the journal Nature Cell Biology. Mr. Schroeder believes the enzymes could be changed in some plants to increase their ability to store water.

The researchers added carbonic anhydrase genes to plants that do not react to higher levels of carbon dioxide. They observed that for every molecule of carbon dioxide taken in by the plants, they lost 44 percent less water.

The scientists say the photosynthesis process continued normally in these plants. They say this suggests that changing plants to save more water will not affect plant growth. This method might be used to help engineer food crops that are resistant to extremely dry conditions. The discovery could help farmers meet a growing demand for food as water supplies decrease. However, the scientists say more research is needed.

And that's the VOA Special English Agriculture report, written by Brianna Blake. For transcripts, MP3s and podcasts of our reports, visit us on the Web at voaspecialenglish.com.

photosynthesis: the process by which green plants turn carbon dioxide and water into food using energy from sunlight 光合作用

enzyme: a substance, usually produced by plants and animals, which helps a chemical change happen or happen more quickly, without being changed itself 酶

anhydrase: an enzyme that catalyzes the removal of water from a material 脫水酶

Related stories:

Keeping plants and trees warm when temperatures drop

New alliance to study greenhouse gases in agriculture

Circular thinking: round barns on US farms

How a hoop house can extend the growing season

(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:translate@chinadaily.com.cn
 
 
主站蜘蛛池模板: 中文字幕欧美在线观看 | 日本特黄网站 | 色偷偷成人网免费视频男人的天堂 | 国产精品免费大片一区二区 | 久久91视频| xxxww在线播放 | 欧美一级特黄真人毛片 | 在线观看国产欧美 | 亚洲精品国产一区二区三区四区 | 国内免费视频成人精品 | 99re思思 | 欧美大片在线观看成人 | 欧美人成在线观看 | 国产亚洲精品激情一区二区三区 | 欧美kkk4444在线观看 | 日韩欧美国产精品第一页不卡 | 亚洲欧洲无码一区二区三区 | 成人免费视频一区二区 | 国产精品九九免费视频 | 国产午夜精品理论片免费观看 | 欧美成人鲁丝片在线观看 | 国产亚洲精品国产一区 | 北岛玲亚洲一区在线观看 | 91成人国产福利 | 国产在线不卡午夜精品2021 | 欧美亚洲国产精品久久久久 | 亚洲国产2017男人a天堂 | 一级特黄牲大片免费视频 | 美女视频免费看视频网站 | 国产美女自拍视频 | 亚洲久久视频 | 日本三级网站 | www日本高清| 午夜视频在线观看一区 | 普通话对白国产情侣自啪 | 99视频在线看 | 久久精品福利视频 | 国产日韩欧美精品 | 午夜a一级毛片一.成 | 国产欧美精品区一区二区三区 | 免费人成在线观看网站品爱网 |