دورية أكاديمية
Photoprotection of Sea-Ice Microalgal Communities from the East Antarctic Pack Ice
| العنوان: | Photoprotection of Sea-Ice Microalgal Communities from the East Antarctic Pack Ice |
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| المؤلفون: | Petrou, K, Hill, R, Doblin, MA, McMinn, A, Johnson, R, Wright, SW, Ralph, PJ |
| بيانات النشر: | Blackwell Publishing Inc |
| سنة النشر: | 2011 |
| مصطلحات موضوعية: | Biological Sciences, Ecology, Marine and Estuarine Ecology (incl. Marine Ichthyology), geo, envir |
| الوصف: | All photosynthetic organisms endeavor to balanceenergy supply with demand. For sea-ice diatoms, aswith all marine photoautotrophs, light is the mostimportant factor for determining growth and carbonfixationrates. Light varies from extremely low tooften relatively high irradiances within the sea-iceenvironment, meaning that sea-ice algae requiremoderate physiological plasticity that is necessary forrapid light acclimation and photoprotection. Thisstudy investigated photoprotective mechanismsemployed by bottom Antarctic sea-ice algae inresponse to relatively high irradiances to understandhow they acclimate to the environmental conditionspresented during early spring, as the light climatebegins to intensify and snow and sea-ice thinningcommences. The sea-ice microalgae displayed highphotosynthetic plasticity to increased irradiance, witha rapid decline in photochemical efficiency that wascompletely reversible when placed under low light.Similarly, the photoprotective xanthophyll pigmentdiatoxanthin (Dt) was immediately activated butreversed during recovery under low light. The xanthophyllinhibitor dithiothreitol (DTT) and state transitioninhibitor sodium fluoride (NaF) were used inunder-ice in situ incubations and revealed that nonphotochemicalquenching (NPQ) via xanthophyllcycleactivation was the preferred method for lightacclimation and photoprotection by bottom sea-icealgae. This study showed that bottom sea-ice algaefrom the east Antarctic possess a high level of plasticityin their light-acclimation capabilities and identifiedthe xanthophyll cycle as a critical mechanism inphotoprotection and the preferred means by whichsea-ice diatoms regulate energy flow to PSII. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | http://ecite.utas.edu.au/75596/1/PetreauTest 2011.pdf; https://doi.org/10.1111/j.1529-8817.2010.00944.xTest |
| DOI: | 10.1111/j.1529-8817.2010.00944.x |
| الإتاحة: | https://doi.org/10.1111/j.1529-8817.2010.00944.xTest http://ecite.utas.edu.au/75596/1/PetreauTest 2011.pdf |
| حقوق: | undefined |
| رقم الانضمام: | edsbas.D0AB6D2C |
| قاعدة البيانات: | BASE |
| DOI: | 10.1111/j.1529-8817.2010.00944.x |
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