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: $ 12.64万
• 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: 2012
• 资助国家: 加拿大
• 起止时间: 2012-01-01 至 2013-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=515695
• 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.

世界各地都使用速生树种的种植园来满足对木纤维日益增长的需求。加拿大也在制定这一战略，因为林业工业希望在靠近工厂的边缘农田上建立混合杨树种植园作为新的木材供应来源。不同杨树品种的亲本杂交是产量最高的树木之一，并广泛种植在商业种植园中。由于其优越的生长特性，杂交杨树是加拿大林业的纸浆、实木产品和能源的宝贵新来源。树木必须能够应对包括干旱在内的环境压力。在加拿大西部，区域干旱与树木死亡和白杨森林生产力下降有关。预计该地区干旱的频率和严重程度将会增加。需要详细了解商业种植的杨树基因型的水关系。由于杨树往往对水供应敏感，因此许多工作都集中在提高其用水效率和耐旱性，同时在各种干旱易发地点保持足够的生产力，并在不进行灌溉的情况下有效利用现有土地基础。虽然杂交杨树作为一个群体具有很高的生产力，但各个克隆在生长和胁迫耐受性方面表现出相当大的差异。 “稳定”克隆在各种生长条件和地点都表现出可接受的生长性能。 “可变”克隆在某些站点上表现出可接受的增长，但在其他站点上表现出较差的性能。我们将使用多种方法来研究稳定克隆与可变克隆的水关系和选定的木材解剖特征。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新配置如何支持对不同环境条件的生理和发育调整。这项工作的结果将应用于树木育种和种植园管理计划。为不同地点的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。