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U.S.-Mexico Cooperative Research: Molecular Characterization of Bacteria Isolated from Casuarina Nodulesin Mexico

美国-墨西哥合作研究：从墨西哥木麻黄结节中分离出的细菌的分子特征

基本信息

批准号：
9402271
负责人：
Ann Hirsch
金额：
$ 4.5万
依托单位：
University of California-Los Angeles
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1995
资助国家：
美国
起止时间：
1995-02-15 至 1998-10-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9402271&HistoricalAwards=false
关键词：
U.S.Mexico Cooperative Research Molecular

项目摘要

9402271 Hirsch This Americas Program award will support Dr. Ann M. Hirsch, University of California, Los Angeles, and Dr. Maria Valdez, Instituto Politecnico Nacional, Mexico, in a research collaboration on nitrogen-fixing symbiosis between Frankia microbe strains and the Casuarina tree (Ironwood). The objective is to find efficient nitrogen-fixing strains that can be used to inoculate Casuarina, an Australian tree introduced in Mexico only 50 years ago. The researchers aim to determine the means by which various isolates found in nodules of the Casuarina tree fix nitrogen, and, particularly, to examine whether the bacteria have alternative nitrogenase genes. Deforestation and the loss of arable lands in tropical and subtropical countries are major global concerns. Numerous efforts to reclaim areas stripped of trees have failed because the fragile tropical soils become depleted in both nitrogen and phosphorous once the trees are removed. The introduction of nitrogen-fixing trees that also establish mycorrhizal relationships is an approach to this problem. This project will enable researchers to identify nitrogen- fixing organisms that are well adapted for nitrogendepleted tropical soils, and is of potential interest to other tropical and subtropical countries having extensively deforested regions with eroded soils. ***

9402271 Hirsch美洲项目奖将支持加州大学洛杉矶分校的Ann M. Hirsch博士和墨西哥国立理工学院的Maria Valdez博士合作研究Frankia微生物菌株与木麻黄树（铁木）之间的固氮共生关系。目的是找到有效的固氮菌株，可以用来接种木麻黄，木麻黄是一种澳大利亚树，50年前才引入墨西哥。研究人员的目标是确定在木麻黄根瘤中发现的各种分离物固定氮的方法，特别是检查细菌是否具有替代的氮酶基因。热带和亚热带国家的森林砍伐和可耕地流失是全球关注的主要问题。许多重新开垦被砍伐树木地区的努力都失败了，因为一旦树木被砍伐，脆弱的热带土壤中的氮和磷就会耗尽。引入固氮树也建立菌根关系是解决这个问题的一种方法。这个项目将使研究人员能够鉴定出能够很好地适应氮枯竭的热带土壤的固氮生物，并且对其他森林被大面积砍伐、土壤被侵蚀的热带和亚热带国家具有潜在的兴趣。＊＊＊