Differences in drought resistance in nine North American hybrid poplars

编号 040019103

推送时间 20190617

研究领域 森林培育 

年份 2019 

类型 期刊 

语种 英语

标题 Differences in drought resistance in nine North American hybrid poplars

来源期刊 trees

期 第191期

发表时间 20190405

关键词 Populus;  Physiology;  Gene expression;  ABA;  Ranking;  Indicator gene; 

摘要 Poplar hybrids are cultivated in North America for environmental applications, agroforestry, and the pulp and paper industry primarily because of their fast growth and limited nutrient requirement. For the same reasons, they have been identified as suitable species for carbon sequestration and as a potential feedstock for carbon–neutral production of energy. The clones deployed on the Canadian prairies are generally regarded as drought sensitive, which poses a problem as water availability has steadily decreased in this region over the past century and a severe water crisis has been predicted. To approach this problem, we tested nine commonly deployed North-American hybrid poplars, developed for large-scale cultivation in the Canadian prairies, for their physiological responses to drought, resulting in a ranking of drought resistance. The difference between the clones showing the most and the least response of drought stress was large, and we used these clones to further examine the differences in the expression of genes known to be up-regulated in response to drought stress. This interrogation showed significant differences in transcript abundance that largely reflected the physiological status of the tested clones, but also many genes being down rather than up-regulated in response to drought stress in the drought-tolerant clone. In particular, putative positive and negative regulators of abscisic acid signaling were expressed at levels consistent with a potential role in observed differences in drought resistance.

服务人员 孙小满

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