| Interactions between water deficit, ABA, and provenances in Picea asperata. | |
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MedLine Citation:
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PMID: 17901194 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The effects of exogenous abscisic acid (ABA) on the acclimation of Picea asperata to water deficit were investigated in two populations originating from wet and dry climate regions of China. Exogenous ABA was sprayed onto the leaves, and changes in plant growth and structure, gas exchange, water use efficiency (WUE), endogenous ABA content, and antioxidant enzyme levels were monitored. The results demonstrated that ABA application affected the two P. asperata populations in different ways during the water deficit. ABA application resulted in significantly lower CO(2) assimilation rates (A) under water deficit in plants from the wet climate population, whereas there were no significant changes in this parameter in the dry climate population. On the other hand, ABA application significantly decreased the dry shoot biomass, stomatal conductance (g(s)), transpiration rate (E), and malondialdehyde (MDA) content, and it significantly increased the leaf mass per area (LMA), root/shoot ratio (Rs), fine root/total root ratio (Ft), WUE, ABA content, and the superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) activities under water-deficit conditions in the dry climate population, whereas ABA application did not significantly affect these parameters in the wet climate population. The results clearly demonstrated that sensitivity to an exogenous ABA application is population-dependent in P. asperata. Direct evidence is presented that variation in physiological mechanisms rather than different rates of ABA absorption explain the population differentiation in the sensitivity to exogenous ABA, and that the physiological basis for the amplified response to water deficit caused by exogenous ABA, present mainly in the dry climate population, is related to internal ABA accumulation. These results provide evidence for adaptive differentiation between populations of P. asperata, and they support the expected relationship between environmental heterogeneity and the magnitude of plastic responses in plant populations. |
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Authors:
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Baoli Duan; Yongqing Yang; Yanwei Lu; Helena Korpelainen; Frank Berninger; Chunyang Li |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of experimental botany Volume: 58 ISSN: 0022-0957 ISO Abbreviation: J. Exp. Bot. Publication Date: 2007 |
Date Detail:
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Created Date: 2007-09-28 Completed Date: 2008-01-29 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882906 Medline TA: J Exp Bot Country: England |
Other Details:
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Languages: eng Pagination: 3025-36 Citation Subset: IM |
Affiliation:
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Chengdu Institute of Biology, Chinese Academy of Sciences, PO Box 416, Chengdu 610041, China. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Abscisic Acid
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metabolism,
pharmacology* Acclimatization / drug effects* Carbon Radioisotopes Malondialdehyde / metabolism Photosynthesis Picea / drug effects, metabolism, physiology* Plant Transpiration Water / metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Carbon Radioisotopes; 21293-29-8/Abscisic Acid; 542-78-9/Malondialdehyde; 7732-18-5/Water |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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