Exploring variation in transcriptional profiles and hydraulic architecture in hybrid poplar clones

探索杂交杨树无性系转录谱和水力结构的变化

• 批准号: 413389-2011
• 负责人: Hacke, Uwe
• 金额: $ 8.49万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=530783
• 关键词: Exploring; variation; transcriptional; profiles; hydraulic

Plantations of fast-growing tree species are used around the world to meet the increasing demand for wood fiber. This strategyis also being developed in Canada, as the forest industrylooks to marginal farmlands, located close to mill sites, to establish hybrid poplar plantations as a new source of wood supply. Hybrids of parents from different poplar species are among the most productive trees and are widelyplanted in commercial plantations. Due to their superior growth characteristics, hybrid poplars are a valuable new source of pulp, solid-wood products, and energyfor the Canadian forest industry.Trees must be able to cope with environmental stress including drought. In western Canada, regional droughts have been linked with tree mortalityand reduced productivityin aspen forests. Drought periods are predicted toincrease in frequencyand severityin this region. There is a need for a detailed understanding of the water relations of commerciallygrown poplar genotypes. Since poplars tend to be sensitive to water supply, much work has focused on increasing their water use efficiencyand drought tolerance while retaining adequate productivityon various drought-prone sites and to utilize the existing land base efficientlywithout irrigation.Although hybrid poplars are highlyproductive as a group, individual clones show considerable differences in growth and stress tolerance. 'Stable' clones show acceptable growth performance over a wide range of growing conditions and sites. 'Variable' clones exhibit acceptable growth on some sites and poor performance on other sites. We will use a wide range of methods to studythe water relations and selected wood anatomical traits of stable versus variable clones. The proposed research takes advantage of various molecular and genomic tools tostudyhow physiological and developmental adjustments to different environmental conditions are underpinnedbyreconfiguration of the transcriptome. The findings from this work will be applied to tree breeding and plantation management programs. Developing a strong scientific basis for clone selection on different sites is a strategic investment into the economic success of the forest industry.

世界各地都在种植快速生长的树种，以满足日益增长的木材纤维需求。加拿大也在制定这一战略，因为森林业希望在靠近磨坊的边际农田建立杂交杨树种植园，作为木材供应的新来源。来自不同杨树品种的杂交亲本是最高产的树木之一，在商业种植园中广泛种植。由于其优越的生长特性，杂交杨树是加拿大林业工业有价值的纸浆、实木产品和能源的新来源。树必须能够应对包括干旱在内的环境压力。在加拿大西部，区域性干旱与白杨林的树木死亡和生产力下降有关。据预测，该地区干旱的频率和严重程度将会增加。有必要对商业种植的杨树的水分关系进行详细的了解。由于杨树往往对水分供应敏感，许多工作都集中在提高它们的水分利用效率和抗旱性，同时在各种干旱易发地点保持足够的生产力，并在不灌溉的情况下有效地利用现有的土地基础。尽管杂交杨树作为一个群体生产力很高，但个体无性系在生长和抗逆性方面表现出很大的差异。“稳定”无性系在广泛的生长条件和地点上表现出可接受的生长表现。“可变”克隆在一些网站上表现出可以接受的增长，而在其他网站上表现不佳。我们将使用广泛的方法研究稳定无性系和变异无性系的水分关系和选定的木材解剖性状。这项拟议的研究利用各种分子和基因组工具来研究转录组的重组如何支持对不同环境条件的生理和发育调整。这项工作的发现将应用于树木育种和种植园管理项目。为在不同地点进行无性系选择奠定坚实的科学基础，是对林业经济成功的战略投资。