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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Flores-Bavestrello, Alejandra Król, Marianna Ivanov, Alexander G. Hüner, Norman P. A. García-Plazaola, José Ignacio Corcuera, Luis J. Bravo, León A. |
| Description | Author Affiliation: Flores-Bavestrello A ( Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Chile. Electronic address: alejandrafloresbavestrello@gmail.com.); Król M ( Department of Biology and The Biotron Centre for Experimental Climate Change Research, Western University, London, Ontario, N6A 5B7, Canada. Electronic address: mkrol@uwo.ca.); Ivanov AG ( Department of Biology and The Biotron Centre for Experimental Climate Change Research, Western University, London, Ontario, N6A 5B7, Canada. Electronic address: aivanov@uwo.ca.); Hüner NP ( Department of Biology and The Biotron Centre for Experimental Climate Change Research, Western University, London, Ontario, N6A 5B7, Canada. Electronic address: nhuner@uwo.ca.); García-Plazaola JI ( Departamento de Biología Vegetal y Ecología, Universidad del País Vasco (UPV/EHU), Aptdo. 644, E-48080 Bilbao, Spain. Electronic address: joseignacio.garcia@ehu.es.); Corcuera LJ ( Departamento de Botánica, Facultad de Ciencias Naturales y Oceanográficas, Universidad de Concepción, Chile. Electronic address: lcorcuer@udec.cl.); Bravo LA ( Departamento de Ciencias Agronómicas y Recursos Naturales, Facultad de Ciencias Agronómicas y Forestales, Universidad de La Frontera, Chile) |
| Abstract | Hymenophyllaceae is a desiccation tolerant family of Pteridophytes which are poikilohydric epiphytes. Their fronds are composed by a single layer of cells and lack true mesophyll cells and stomata. Although they are associated with humid and shady environments, their vertical distribution varies along the trunk of the host plant with some species inhabiting the drier sides with a higher irradiance. The aim of this work was to compare the structure and function of the photosynthetic apparatus during desiccation and rehydration in two species, Hymenophyllum dentatum and Hymenoglossum cruentum, isolated from a contrasting vertical distribution along the trunk of their hosts. Both species were subjected to desiccation and rehydration kinetics to analyze frond phenotypic plasticity, as well as the structure, composition and function of the photosynthetic apparatus. Minimal differences in photosynthetic pigments were observed upon dehydration. Measurements of ÏPSII (effective quantum yield of PSII), ÏNPQ (quantum yield of the regulated energy dissipation of PSII), ÏNO (quantum yield of non-regulated energy dissipation of PSII), and TL (thermoluminescence) indicate that both species convert a functional photochemical apparatus into a structure which exhibits maximum quenching capacity in the dehydrated state with minimal changes in photosynthetic pigments and polypeptide compositions. This dehydration-induced conversion in the photosynthetic apparatus is completely reversible upon rehydration. We conclude that H. dentatum and H. cruentum are homoiochlorophyllous with respect to desiccation stress and exhibited no correlation between inherent desiccation tolerance and the vertical distribution along the host tree trunk. |
| File Format | HTM / HTML |
| ISSN | 01761617 |
| Journal | Journal of Plant Physiology |
| Volume Number | 191 |
| e-ISSN | 16181328 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2016-02-01 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Botany |
| Content Type | Text |
| Resource Type | Article |
| Subject | Physiology Plant Science Agronomy and Crop Science |
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