Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth
Heat stress is known to induce photoinhibition, leaf senescence, and nutrient remobilization in terrestrial plants with apical growth, however, its effect on blade erosion and associated-changes in chemical compositions has rarely been studied in marine macroalgae with intercalary growth such as kel...
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doaj-b346ea8ef32e4552aa670e4d902b56442020-11-25T03:52:48ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452020-09-01710.3389/fmars.2020.575721575721Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary GrowthHikaru Endo0Eri Inomata1Xu Gao2Junji Kinoshita3Yoichi Sato4Yoichi Sato5Yukio Agatsuma6Graduate School of Agricultural Science, Tohoku University, Sendai, JapanGraduate School of Agricultural Science, Tohoku University, Sendai, JapanGraduate School of Agricultural Science, Tohoku University, Sendai, JapanGraduate School of Agricultural Science, Tohoku University, Sendai, JapanRiken Food Co., Ltd., Tagajo, JapanNishina Center for Accelerator-Based Science, RIKEN, Saitama, JapanGraduate School of Agricultural Science, Tohoku University, Sendai, JapanHeat stress is known to induce photoinhibition, leaf senescence, and nutrient remobilization in terrestrial plants with apical growth, however, its effect on blade erosion and associated-changes in chemical compositions has rarely been studied in marine macroalgae with intercalary growth such as kelp. The present study examined the combined effects of ocean warming (23 and 26°C), irradiance (30 and 180 μmol m–2 s–1), and nutrient enrichment (enriched and non-enriched) on photosystem II maximum efficiency (Fv/Fm) in the kelp Eisenia bicyclis. It also investigated the effect of ocean warming on the kelp’s relative growth rates based on five morphological parameters and three chemical compositions (carbon, nitrogen, and phlorotannnins). A warming effect on photoinhibition (i.e., decline in Fv/Fm) was only detected under the higher irradiance combined with nutrient-enrichment condition. Under this condition, elevated temperature decreased relative growth rates to negative values, indicating occurrence of apical blade erosion. Temperature elevation also caused increases in nitrogen and phlorotannin contents within the whole body, but not carbon content. Moreover, nitrogen content in the meristems at 26°C was higher than that at 23°C, although such a difference was not observed with phlorotannin content. These results suggested that heat-induced apical blade erosion promoted nitrogen accumulation in the meristems, located in the lower part of the blade, in E. bicyclis.https://www.frontiersin.org/article/10.3389/fmars.2020.575721/fullclimate changenon-additive effecthigh-temperature tolerancefoundation specieskelp |
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DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hikaru Endo Eri Inomata Xu Gao Junji Kinoshita Yoichi Sato Yoichi Sato Yukio Agatsuma |
spellingShingle |
Hikaru Endo Eri Inomata Xu Gao Junji Kinoshita Yoichi Sato Yoichi Sato Yukio Agatsuma Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth Frontiers in Marine Science climate change non-additive effect high-temperature tolerance foundation species kelp |
author_facet |
Hikaru Endo Eri Inomata Xu Gao Junji Kinoshita Yoichi Sato Yoichi Sato Yukio Agatsuma |
author_sort |
Hikaru Endo |
title |
Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth |
title_short |
Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth |
title_full |
Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth |
title_fullStr |
Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth |
title_full_unstemmed |
Heat Stress Promotes Nitrogen Accumulation in Meristems via Apical Blade Erosion in a Brown Macroalga With Intercalary Growth |
title_sort |
heat stress promotes nitrogen accumulation in meristems via apical blade erosion in a brown macroalga with intercalary growth |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Marine Science |
issn |
2296-7745 |
publishDate |
2020-09-01 |
description |
Heat stress is known to induce photoinhibition, leaf senescence, and nutrient remobilization in terrestrial plants with apical growth, however, its effect on blade erosion and associated-changes in chemical compositions has rarely been studied in marine macroalgae with intercalary growth such as kelp. The present study examined the combined effects of ocean warming (23 and 26°C), irradiance (30 and 180 μmol m–2 s–1), and nutrient enrichment (enriched and non-enriched) on photosystem II maximum efficiency (Fv/Fm) in the kelp Eisenia bicyclis. It also investigated the effect of ocean warming on the kelp’s relative growth rates based on five morphological parameters and three chemical compositions (carbon, nitrogen, and phlorotannnins). A warming effect on photoinhibition (i.e., decline in Fv/Fm) was only detected under the higher irradiance combined with nutrient-enrichment condition. Under this condition, elevated temperature decreased relative growth rates to negative values, indicating occurrence of apical blade erosion. Temperature elevation also caused increases in nitrogen and phlorotannin contents within the whole body, but not carbon content. Moreover, nitrogen content in the meristems at 26°C was higher than that at 23°C, although such a difference was not observed with phlorotannin content. These results suggested that heat-induced apical blade erosion promoted nitrogen accumulation in the meristems, located in the lower part of the blade, in E. bicyclis. |
topic |
climate change non-additive effect high-temperature tolerance foundation species kelp |
url |
https://www.frontiersin.org/article/10.3389/fmars.2020.575721/full |
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