| An alternative strategy of dismantling of the chloroplasts during leaf senescence observed in a high yield variety of barley. | |
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MedLine Citation:
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PMID: 22098170 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Changes in function and composition of the photosynthetic apparatus as well as the ultrastructure of chloroplasts in mesophyll cells were analyzed in flag leaves of the high yield barley (Hordeum vulgare) variety cv. Lomerit during senescence under field conditions in two successive years. In contrast to previous results obtained with the elder variety cv. Carina photosystem II efficiency measured by Fv/Fm was found to be rather stable until a very late stage of senescence. Chlorophyll a fluorescence and P700 absorbance measurements revealed that the activities of the two photosystems declined in parallel. An increase in the chlorophyll a/b ratio at a late stage of senescence was observed to coincide with a decline in the level of the Lhcb1 apoprotein of the light harvesting complex and the level of the corresponding transcript. Ultrastructural investigations revealed the presence of gerontoplasts which have long single or pairwise thylakoids and lack large grana stacks. It is hypothesized that the early degradation of grana thylakoids harboring the major light harvesting complex reduced the risk of photoinhibition and might be causally related to the high yield of the barley variety cv. Lomerit. |
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Authors:
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Karin Krupinska; Maria Mulisch; Julien Hollmann; Krzysztof Tokarz; Wiebke Zschiesche; Henning Kage; Klaus Humbeck; Wolfgang Bilger |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-19 |
Journal Detail:
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Title: Physiologia plantarum Volume: - ISSN: 1399-3054 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-11-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 1256322 Medline TA: Physiol Plant Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © Physiologia Plantarum 2011. |
Affiliation:
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Institute of Botany, Christian-Albrechts-University of Kiel, Olshausenstraße 40, 24098 Kiel, Germany Agronomy and Crop Science, Christian-Albrechts-University of Kiel, Hermann-Rodewald-Str. 9, 24118 Kiel, Germany Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239 Crakow, Poland Institute of Biology, Martin-Luther University, Weinbergweg 10, 06120 Halle, Germany. |
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