Knowledge Resource Center for Ecological Environment in Arid Area
| 项目编号 | 9119560 |
| Hydraulic Limitations in Arid Land Shrubs | |
| Jonathan Comstock | |
| 主持机构 | University of Utah |
| 开始日期 | 1992-02-15 |
| 结束日期 | 1993-07-31 |
| 资助经费 | 90537(USD) |
| 项目类别 | Standard Grant |
| 资助机构 | US-NSF（美国国家科学基金会） |
| 项目所属计划 | ECOLOGICAL & EVOLUTIONARY PHYS |
| 语种 | 英语 |
| 国家 | 美国 |
| 英文简介 | Hymenoclea salsola is a warm-desert shrub with a large geographic range in North American deserts. When plants originating from diverse geographic locations were grown in a common garden, genetic differentiation was observed in plant characters influencing the rate and photosynthetic efficiency of water consumption. It is hypothesized that environmentally- imposed variation in water-loss rates alters the balance between water acquisition and consumption, and accounts for the genetic differentiation of different geographic races. To investigate the underlying mechanisms, separate measures of root, stem and whole plant hydraulic conductance (water transport capacity between soil and leaf) will be make using several techniques applying known pressure differentials over the respective pathways and determining consequent flux rates. These data will be integrated with measures of whole canopy gas-exchange (water- loss and photosynthesis), and carbon isotope discrimination during photosynthesis. The plasticity of individual genotypes to short-term changes in growth conditions will be compared with genetic differentiation to contrasting conditions over evolutionary time. The importance of hydraulic limitations will be evaluated in terms of immediate feed-back control on stomatal behavior, and also long-term adaptive differentiation across geographic races. The results will enhance our understanding of 1) the integration of resource capture and consumption in plant water relations, 2) limitations imposed by plant morphology on physiological activity, 3) mechanistic relationships between plant water-use characteristics and climatic variation, and 4) the relationship of a unique arid-land plant habit, a canopy of photosynthetic stems, to general principles of plant water- relations. |
| 来源学科分类 | Biological Sciences |
| URL | https://www.nsf.gov/awardsearch/showAward?AWD_ID=9119560 |
| 资源类型 | 项目 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/341016 |
| 推荐引用方式 GB/T 7714 | Jonathan Comstock.Hydraulic Limitations in Arid Land Shrubs.1992. |
| 条目包含的文件 | 条目无相关文件。 | |||||
| 个性服务 |
| 推荐该条目 |
| 保存到收藏夹 |
| 导出为Endnote文件 |
| 谷歌学术 |
| 谷歌学术中相似的文章 |
| [Jonathan Comstock]的文章 |
| 百度学术 |
| 百度学术中相似的文章 |
| [Jonathan Comstock]的文章 |
| 必应学术 |
| 必应学术中相似的文章 |
| [Jonathan Comstock]的文章 |
| 相关权益政策 |
| 暂无数据 |
| 收藏/分享 |
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
