Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period
P align=justify>Cymodocea nodosa plants were dark incubated for four months. The potential of reactivating photosynthesis was tested in an experiment in which half of the plants were reilluminated (HL) while the other half were grown under very low irradiance levels (LL). Photosynthesis was measu...
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Consejo Superior de Investigaciones Científicas
2006-09-01
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doaj-fd17948298924e5f8e03dadc1c0f52652021-05-05T13:49:43ZengConsejo Superior de Investigaciones CientíficasScientia Marina0214-83581886-81342006-09-0170341342210.3989/scimar.2006.70n341390Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark periodErik-Jan Malta0Fernando G. Brun1Juan J. Vergara2Ignacio Hernández3J. Lucas Pérez-Lloréns4Área de Ecología, Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de CádizÁrea de Ecología, Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de CádizÁrea de Ecología, Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de CádizÁrea de Ecología, Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de CádizÁrea de Ecología, Departamento de Biología, Facultad de Ciencias del Mar y Ambientales, Universidad de CádizP align=justify>Cymodocea nodosa plants were dark incubated for four months. The potential of reactivating photosynthesis was tested in an experiment in which half of the plants were reilluminated (HL) while the other half were grown under very low irradiance levels (LL). Photosynthesis was measured using PAM fluorescence and tissue nutrient and carbohydrate contents were analysed. Photosynthetic efficiency (Fv/Fm) in HL plants increased from 0 to 0.58, whereas LL plants remained inactive. Photosynthetic parameters also increased, resulting in a final Ik of 97.5 µmol m-2 s-1. Leaf shedding led to a negative mean RGR in HL plants. Tissue C and N dropped considerably during dark incubation in both rhizomes and shoots. Starch content was nearly equal for rhizomes and shoots (4.3 mg /g DW) and was not affected by dark incubation. In contrast, sucrose content dropped from 40.0 mg /g DW to zero in shoots and from 240 to 40.0 mg /g DW in rhizomes in HL plants. We conclude that C. nodosa is capable of recovering photosynthetic activity after four months darkness, which is considerably longer than the 80 d recorded so far for a seagrass. Stored carbohydrates, more specifically sucrose, play an important role in both survival and reactivation.http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/93cymodocea nodosachlorophyll fluorescencelightcarbohydratessurvival |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Erik-Jan Malta Fernando G. Brun Juan J. Vergara Ignacio Hernández J. Lucas Pérez-Lloréns |
spellingShingle |
Erik-Jan Malta Fernando G. Brun Juan J. Vergara Ignacio Hernández J. Lucas Pérez-Lloréns Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period Scientia Marina cymodocea nodosa chlorophyll fluorescence light carbohydrates survival |
author_facet |
Erik-Jan Malta Fernando G. Brun Juan J. Vergara Ignacio Hernández J. Lucas Pérez-Lloréns |
author_sort |
Erik-Jan Malta |
title |
Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period |
title_short |
Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period |
title_full |
Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period |
title_fullStr |
Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period |
title_full_unstemmed |
Recovery of Cymodocea nodosa (Ucria) Ascherson photosynthesis after a four-month dark period |
title_sort |
recovery of cymodocea nodosa (ucria) ascherson photosynthesis after a four-month dark period |
publisher |
Consejo Superior de Investigaciones Científicas |
series |
Scientia Marina |
issn |
0214-8358 1886-8134 |
publishDate |
2006-09-01 |
description |
P align=justify>Cymodocea nodosa plants were dark incubated for four months. The potential of reactivating photosynthesis was tested in an experiment in which half of the plants were reilluminated (HL) while the other half were grown under very low irradiance levels (LL). Photosynthesis was measured using PAM fluorescence and tissue nutrient and carbohydrate contents were analysed. Photosynthetic efficiency (Fv/Fm) in HL plants increased from 0 to 0.58, whereas LL plants remained inactive. Photosynthetic parameters also increased, resulting in a final Ik of 97.5 µmol m-2 s-1. Leaf shedding led to a negative mean RGR in HL plants. Tissue C and N dropped considerably during dark incubation in both rhizomes and shoots. Starch content was nearly equal for rhizomes and shoots (4.3 mg /g DW) and was not affected by dark incubation. In contrast, sucrose content dropped from 40.0 mg /g DW to zero in shoots and from 240 to 40.0 mg /g DW in rhizomes in HL plants. We conclude that C. nodosa is capable of recovering photosynthetic activity after four months darkness, which is considerably longer than the 80 d recorded so far for a seagrass. Stored carbohydrates, more specifically sucrose, play an important role in both survival and reactivation. |
topic |
cymodocea nodosa chlorophyll fluorescence light carbohydrates survival |
url |
http://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/93 |
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