Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida
In freshwaters, dissolved humic substances ( HS s) distinguish apparently HS ‐avoiding Charophytes from apparently HS ‐tolerant ones, but the underlying mechanisms so far remain obscure. In this contribution, we tested direct and indirect effects of HS s on Chara hispida (L.) Hartm. Using Rhodamine...
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crwiley:10.1111/jpy.12012 2024-05-19T07:38:57+00:00 Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida Pörs, Yvonne Steinberg, Christian E. W. Federal Ministry of Economy and Technology 2012 http://dx.doi.org/10.1111/jpy.12012 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjpy.12012 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.12012 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 48, issue 6, page 1522-1529 ISSN 0022-3646 1529-8817 journal-article 2012 crwiley https://doi.org/10.1111/jpy.12012 2024-04-25T08:27:56Z In freshwaters, dissolved humic substances ( HS s) distinguish apparently HS ‐avoiding Charophytes from apparently HS ‐tolerant ones, but the underlying mechanisms so far remain obscure. In this contribution, we tested direct and indirect effects of HS s on Chara hispida (L.) Hartm. Using Rhodamine B, we showed that C. hispida is able to adsorb or even uptake and, subsequently, desorb and depurate organic compounds in the molecular mass range of the applied fulvic acids. To classify direct and indirect HS ‐mediated effects due to reduced light quantities, or to effects more strongly elicited by red relative to blue light, plants were exposed to HS s directly as well as through a neutral foil, or shaded by means of an external HS ‐containing reservoir (low‐light variant). We showed that the apparently HS ‐tolerant C. hispida exhibited reduced lipid peroxidation and non photochemical quenching of chlorphyll fluorescence when exposed to HS s. Plants directly exposed to HS s were significantly different from control as well as to foil‐shaded plants in terms of chl a + b , VAZ /chl, and β‐Car/chl; yet, in low‐light plants these variables did not differ from control and HS ‐exposed plants, suggesting that the shift in favor of red lights in the low‐light variant led to a reduction in its cells' internal antioxidant content. However, the Fv/Fm ratio in HS ‐exposed plants decreased more slowly than in all other exposure variants, indicating that the photosynthetic apparatus aged more slowly, by a mechanism yet to be discovered. Our study indicates that both direct and indirect effects contribute to the HS tolerance of C. hispida . Article in Journal/Newspaper Chara hispida Wiley Online Library Journal of Phycology 48 6 1522 1529 |
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English |
description |
In freshwaters, dissolved humic substances ( HS s) distinguish apparently HS ‐avoiding Charophytes from apparently HS ‐tolerant ones, but the underlying mechanisms so far remain obscure. In this contribution, we tested direct and indirect effects of HS s on Chara hispida (L.) Hartm. Using Rhodamine B, we showed that C. hispida is able to adsorb or even uptake and, subsequently, desorb and depurate organic compounds in the molecular mass range of the applied fulvic acids. To classify direct and indirect HS ‐mediated effects due to reduced light quantities, or to effects more strongly elicited by red relative to blue light, plants were exposed to HS s directly as well as through a neutral foil, or shaded by means of an external HS ‐containing reservoir (low‐light variant). We showed that the apparently HS ‐tolerant C. hispida exhibited reduced lipid peroxidation and non photochemical quenching of chlorphyll fluorescence when exposed to HS s. Plants directly exposed to HS s were significantly different from control as well as to foil‐shaded plants in terms of chl a + b , VAZ /chl, and β‐Car/chl; yet, in low‐light plants these variables did not differ from control and HS ‐exposed plants, suggesting that the shift in favor of red lights in the low‐light variant led to a reduction in its cells' internal antioxidant content. However, the Fv/Fm ratio in HS ‐exposed plants decreased more slowly than in all other exposure variants, indicating that the photosynthetic apparatus aged more slowly, by a mechanism yet to be discovered. Our study indicates that both direct and indirect effects contribute to the HS tolerance of C. hispida . |
author2 |
Federal Ministry of Economy and Technology |
format |
Article in Journal/Newspaper |
author |
Pörs, Yvonne Steinberg, Christian E. W. |
spellingShingle |
Pörs, Yvonne Steinberg, Christian E. W. Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
author_facet |
Pörs, Yvonne Steinberg, Christian E. W. |
author_sort |
Pörs, Yvonne |
title |
Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
title_short |
Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
title_full |
Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
title_fullStr |
Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
title_full_unstemmed |
Humic Substances Delay Aging of the Photosynthetic Apparatus of Chara hispida |
title_sort |
humic substances delay aging of the photosynthetic apparatus of chara hispida |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/jpy.12012 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fjpy.12012 https://onlinelibrary.wiley.com/doi/pdf/10.1111/jpy.12012 |
genre |
Chara hispida |
genre_facet |
Chara hispida |
op_source |
Journal of Phycology volume 48, issue 6, page 1522-1529 ISSN 0022-3646 1529-8817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/jpy.12012 |
container_title |
Journal of Phycology |
container_volume |
48 |
container_issue |
6 |
container_start_page |
1522 |
op_container_end_page |
1529 |
_version_ |
1799478442262003712 |