| Photosynthetic response of pepper plants to wilt induced by Verticillium dahliae and soil water deficit. | |
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MedLine Citation:
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PMID: 20172618 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Greenhouse experiments were conducted to compare stress effects caused by Verticillium dahliae and drought on gas exchange, chlorophyll (Chl) fluorescence and photosynthetic pigments of pepper plants. Three treatments were compared: Verticillium inoculated plants (+V), non-inoculated well-watered plants (-V) and non-inoculated plants subjected to progressive drought (D). Gas exchange, fluorescence and photosynthetic pigments were measured and represented along a gradient of relative water content (RWC) and stomatal conductance (g(s)). Net photosynthesis (A) and electron transport rate (ETR) decreased, as RWC and g(s) declined, similarly in both +V and D plants. However, dark respiration (R(D)) and photorespiration (R(L)) tended to increase in inoculated plants compared to those subjected to soil drought, as g(s) decreased. Photoinhibitory damage was not observed in infected or in droughted plants. Soil drought decreased intrinsic PSII efficiency (Phi(exc.)), which seemed to result in part from enhanced xanthophyll cycle- and/or lutein-related thermal energy dissipation. Nevertheless, the fact that 1-Phi(exc.) increased in D only at high values of the de-epoxidation state of the xanthophyll cycle (DPS) suggests that DeltapH could be the major factor controlling thermal energy dissipation in this treatment. By contrast, antheraxanthin, zeaxanthin and lutein, as well as Phi(exc.), were not markedly affected in +V. Water stress appeared to be the main limitation to photosynthesis in Verticillium infected plants, probably through stomatal closure, together with impaired mesophyll conductance (g(m)). However, our results indicate differential effects of V. dahliae on dark respiration, photorespiration, g(m) and on the capability of thermal energy dissipation under low g(s) values. |
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Authors:
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I Pascual; I Azcona; F Morales; J Aguirreolea; M Sánchez-Díaz |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-20 |
Journal Detail:
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Title: Journal of plant physiology Volume: 167 ISSN: 1618-1328 ISO Abbreviation: J. Plant Physiol. Publication Date: 2010 Jun |
Date Detail:
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Created Date: 2010-04-19 Completed Date: 2010-07-23 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9882059 Medline TA: J Plant Physiol Country: Germany |
Other Details:
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Languages: eng Pagination: 701-8 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier GmbH. All rights reserved. |
Affiliation:
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Departamento Biología Vegetal, Facultades de Ciencias y Farmacia, Universidad de Navarra, Pamplona, Spain. ipascual@unav.es |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Capsicum
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microbiology*,
physiology* Droughts* Gene Expression Regulation, Plant / physiology Photosynthesis / physiology* Verticillium / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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