| Leaf patch clamp pressure probe measurements on olive leaves in a nearly turgorless state. | |
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MedLine Citation:
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PMID: 22288430 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The non-invasive leaf patch clamp pressure (LPCP) probe measures the attenuated pressure of a leaf patch, P(p) , in response to an externally applied magnetic force. P(p) is inversely coupled with leaf turgor pressure, P(c) , i.e. at high P(c) values the P(p) values are small and at low P(c) values the P(p) values are high. This relationship between P(c) and P(p) could also be verified for 2-m tall olive trees under laboratory conditions using the cell turgor pressure probe. When the laboratory plants were subjected to severe water stress (P(c) dropped below ca. 50 kPa), P(p) curves show reverse diurnal changes, i.e. during the light regime (high transpiration) a minimum P(p) value, and during darkness a peak P(p) value is recorded. This reversal of the P(p) curves was completely reversible. Upon watering, the original diurnal P(p) changes were re-established within 2-3 days. Olive trees in the field showed a similar turnover of the shape of the P(p) curves upon drought, despite pronounced fluctuations in microclimate. The reversal of the P(p) curves is most likely due to accumulation of air in the leaves. This assumption was supported with cross-sections through leaves subjected to prolonged drought. In contrast to well-watered leaves, microscopic inspection of leaves exhibiting inverse diurnal P(p) curves revealed large air-filled areas in parenchyma tissue. Significantly larger amounts of air could also be extracted from water-stressed leaves than from well-watered leaves using the cell turgor pressure probe. Furthermore, theoretical analysis of the experimental P(p) curves shows that the propagation of pressure through the nearly turgorless leaf must be exclusively dictated by air. Equations are derived that provide valuable information about the water status of olive leaves close to zero P(c) . |
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Authors:
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W Ehrenberger; S Rüger; C M Rodríguez-Domínguez; A Díaz-Espejo; J E Fernández; J Moreno; D Zimmermann; V L Sukhorukov; U Zimmermann |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-1-30 |
Journal Detail:
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Title: Plant biology (Stuttgart, Germany) Volume: - ISSN: 1438-8677 ISO Abbreviation: - Publication Date: 2012 Jan |
Date Detail:
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Created Date: 2012-1-31 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101148926 Medline TA: Plant Biol (Stuttg) Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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© 2012 German Botanical Society and The Royal Botanical Society of the Netherlands. |
Affiliation:
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Lehrstuhl für Biotechnologie, Biozentrum, Universität Würzburg, Würzburg, Germany ZIM Plant Technology GmbH, Hennigsdorf, Germany Instituto de Recursos Naturales y Agrobiología (IRNAS-CSIC), Sevilla, Spain Departamento de Biología Celular, Universidad de Sevilla, Sevilla, Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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