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Publication Type J
Authors Phandee, S; Buapet, P
Author Full Name Phandee, Surangkana; Buapet, Pimchanok
Title Photosynthetic and antioxidant responses of the tropical intertidal seagrasses Halophila ovalis and Thalassia hemprichii to moderate and high irradiances
Source BOTANICA MARINA
Language English
Document Type Article
Author Keywords antioxidant enzymes; chloroplast movement; high irradiances; oxidative stress; photosynthesis; seagrass
Keywords Plus POSIDONIA-OCEANICA; DIURNAL-VARIATION; CYMODOCEA-NODOSA; HOOK. F; LIGHT; STRESS; PARAQUAT; PLANTS; PHOTOINHIBITION; RESISTANCE
Abstract This study investigated photosynthetic and oxidative stress-related responses to moderate (500 mu mol photons m(-2) s(-1)) and high irradiances (1500 mu mol photons m(-2) s(-1)) in two tropical intertidal seagrasses, Halophila ovalis and Thalassia hemprichii. Exposure to high irradiance for 3 h resulted in a large decline in the maximum quantum yield of photosystem II (Fv/Fm) and in the effective quantum yield of photosystem II (FPSII) but induced nonphotochemical quenching (NPQ) and chloroplast clumping in H. ovalis. Thalassia hemprichii, however, showed only a minor decrease in Fv/Fm and FPSII, and no change in either NPQ or the intracellular arrangement of chloroplasts. The irradiance did not affect reactive oxygen species (ROS) or superoxide dismutase (SOD) activity in either seagrass, whereas high irradiance enhanced ascorbate peroxidase (APX) activity in H. ovalis. The results from a subsequent experiment using an oxidative stress inducer, methyl viologen (MV), also showed a higher degree of Fv/Fm inhibition in H. ovalis. These results show that H. ovalis is much more physiologically responsive to high irradiances and oxidative stress than T. hemprichii and that its photoprotective mechanisms involve NPQ, APX and reduction of the amount of light absorbed through the clumping of its chloroplasts.
Author Address [Phandee, Surangkana; Buapet, Pimchanok] Prince Songkla Univ, Fac Sci, Dept Biol, Plant Physiol Lab, Hat Yai, Songkhla, Thailand; [Phandee, Surangkana; Buapet, Pimchanok] Prince Songkla Univ, Coastal Oceanog & Climate Change Res Ctr, Hat Yai, Songkhla, Thailand
Reprint Address Buapet, P (reprint author), Prince Songkla Univ, Fac Sci, Dept Biol, Plant Physiol Lab, Hat Yai, Songkhla, Thailand.; Buapet, P (reprint author), Prince Songkla Univ, Coastal Oceanog & Climate Change Res Ctr, Hat Yai, Songkhla, Thailand.
E-mail Address pimchanok.b@psu.ac.th
Funding Agency and Grant Number Research Fund for DPST - Institute for the Promotion of Teaching Science and Technology (IPST) [16/2557]; Department of Biology, Faculty of Science, Prince of Songkla University; Development and Promotion of Science and Technology Talents Project (DPST)
Funding Text This project was financially supported by the Research Fund for DPST Graduates with First Placement Fiscal Year 2014 awarded by the Institute for the Promotion of Teaching Science and Technology (IPST) for PB (grant no. 16/2557, Mentor: Assoc. Prof. Dr. Anchana Prathep). Partial funding was supported by the Department of Biology, Faculty of Science, Prince of Songkla University and the Development and Promotion of Science and Technology Talents Project (DPST) for SP. Finally, the authors acknowledge Anna Chatthong, Dr. Seppo Karrila and the RDO of PSU for assistance with the English proofreading.
Cited Reference Count 53
Times Cited 1
Total Times Cited Count (WoS, BCI, and CSCD) 1
Publisher WALTER DE GRUYTER GMBH
Publisher City BERLIN
Publisher Address GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY
ISSN 0006-8055
29-Character Source Abbreviation BOT MAR
ISO Source Abbreviation Bot. Marina
Publication Date JUN
Year Published 2018
Volume 61
Issue 3
Beginning Page 247
Ending Page 256
Digital Object Identifier (DOI) 10.1515/bot-2017-0084
Page Count 10
Web of Science Category Plant Sciences; Marine & Freshwater Biology
Subject Category Plant Sciences; Marine & Freshwater Biology
Document Delivery Number GH8FW
Unique Article Identifier WOS:000433904000008
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