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Author Ma, Fei ♦ Zhao, Changming ♦ Milne, Richard ♦ Ji, Mingfei ♦ Chen, Litong ♦ Liu, Jianquan
Source World Health Organization (WHO)-Global Index Medicus
Content type Text
Publisher Wiley
File Format HTM / HTML
Language English
Difficulty Level Medium
Subject Domain (in DDC) Natural sciences & mathematics ♦ Chemistry & allied sciences ♦ Life sciences; biology ♦ Physiology & related subjects ♦ Biochemistry ♦ Genetics and evolution ♦ Natural history of organisms ♦ Technology ♦ Medicine & health ♦ Human physiology ♦ Pharmacology and therapeutics ♦ Diseases ♦ Manufacture for specific uses ♦ Precision instruments & other devices
Subject Domain (in MeSH) Eukaryota ♦ Organisms ♦ Nutritional and Metabolic Diseases ♦ Diseases ♦ Inorganic Chemicals ♦ Chemicals and Drugs ♦ Investigative Techniques ♦ Analytical, Diagnostic and Therapeutic Techniques and Equipment ♦ Genetic Phenomena ♦ Physiological Phenomena ♦ Reproductive and Urinary Physiological Phenomena ♦ Biological Phenomena ♦ Biological Sciences ♦ Natural Science Disciplines ♦ Physical Sciences
Subject Keyword Discipline Botany ♦ Adaptation, Physiological ♦ Genetics ♦ Droughts ♦ Ecosystem ♦ Hybridization, Genetic ♦ Pinus ♦ Physiology ♦ Stress, Physiological ♦ Biomass ♦ Dehydration ♦ Ecology ♦ Haploidy ♦ Reproduction ♦ Seedling ♦ Water ♦ Journal Article ♦ Research Support, Non-u.s. Gov't
Abstract The homoploid hybrid species Pinus densata is restricted to alpine habitats that exceed the altitude range of its two parental species, Pinus tabulaeformis and Pinus yunnanensis. Alpine habitats usually generate cold-induced water stress in plants. To understand the ecological differentiation between these three species, we examined their physiological responses to drought stress. Potted seedlings of three species were subjected to low, mild, moderate and severe water stress in an automatic-controlled glasshouse. Fifteen indicators of fitness were measured for each species in each treatment, and most of these decreased as drought increased. Pinus densata exhibited higher fitness than both parental species in terms of total dry mass production (TDM) and long-term water use efficiency (WUE(L)) across all treatments; several other ecophysiological traits were also extreme but not across every treatment, and not always in the highest stress treatment. These results indicate that extreme characters that have become well fixed in P. densata, confer a faster seedling growth rate and more efficient water use, which in turn should confer increased drought tolerance. These traits of P. densata likely promoted its ecological separation from its parental species and facilitated its successful colonization and establishment in high-altitude habitats.
Description Country affiliation: China
Author Affiliation: Ma F ( Key Laboratory of Arid and Grassland Ecology, School of Life Sciences, Lanzhou University, Lanzhou 730000, Gansu, China.)
ISSN 0028646X
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Reading ♦ Research ♦ Self Learning
Interactivity Type Expositive
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2010-01-01
Publisher Place Great Britain (UK)
e-ISSN 14698137
Journal New Phytologist
Volume Number 185
Issue Number 1

Source: WHO-Global Index Medicus