检索结果-南通市图书馆

Improved Growth and Stress Tolerance in the Arabidopsis oxtl Mutant Triggered by Altered Adenine Metabolism

Molecular Plant 2012年第6期5卷 1310-1332页

作者： Suchada Sukrong Kil-Young Yun Patrizia Stadler Charan Kumar Tony Facciuolo Barbara A.Moffatt Deane L.Falconec Department of Plant and Soil Science University of KentuckyLexingtonKY 40546USA Present address:Department of Pharmacognosy Faculty of Pharmaceutical SciencesChulalongkorn UniversityBangkokThailand Department of Biological Sciences University of MassachusettsOne University AvenueLowellMA 01854USA Present address:Fungi and Plant Co.Ltd Chungcheongbuk-doRepublic of Korea Department of Biology University of WaterlooWaterlooOntarioCanada

Plants perceive and respond to environmental stresses with complex mechanisms that are often associ- ated with the activation of antioxidant defenses. A genetic screen aimed at isolating oxidative stress-tolerant lines of Arabidopsis thaliana has identified oxtl, a line that exhibits improved tolerance to oxidative stress and elevated temperature but displays no apparent deleterious growth effects under non-stress conditions. Oxtl harbors a muta- tion that arises from the altered expression of a gene encoding adenine phosphoribosyltransferase （APT1）, an enzyme that converts adenine to adenosine monophosphate （AMP）, indicating a link between purine metabolism, whole-plant growth responses, and stress acclimation. The oxtl mutation results in decreased APT1 expression that leads to reduced enzymatic activity. Correspondingly, oxtl plants possess elevated levels of adenine. Decreased APT enzyme activity dir- ectly correlates with stress resistance in transgenic lines that ectopically express APT1. The metabolic alteration in oxtl plants also alters the expression of several antioxidant defense genes and the response of these genes to oxidative chal- lenge. Finally, it is shown that manipulation of adenine levels can induce stress tolerance to wild-type plants. Collectively, these results show that alterations in cellular adenine levels can trigger stress tolerance and improve growth, leading to increases in plant biomass. The results also suggest that adenine might play a part in the signals that modulate responses to abiotic stress and plant growth.

关键词： abiotic/oxidative environmental stress acclimation priming purine signaling salvage pathway thermotolerance.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：