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Effect of high light and desiccation on photosystem Ⅱ in the seedlings and mature plants of tropical seagrass enhalus acoroides during low tide

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Journal of Oceanology and Limnology 2023年第1期41卷 241-250页

作者： Xingkai CHE Hu LI Litao ZHANG Jianguo LIU CAS and Shandong Key Laboratory of Experimental Marine Biology Center for Ocean Mega-ScienceInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

During low tide,the intertidal seagrass enhalus acoroides is often exposed to high light and desiccation,which can seriously threaten its survival,at least partly by inhibiting photosystem Ⅱ(PSⅡ)*** response of leaves of *** to high light and desiccation was compared for seedlings and mature *** show that the resistance of seedling and mature leaves to high light was quite similar,but to desiccation was very *** leaves were more sensitive to desiccation than the mature plant leaves,but had better water *** damage of desiccation to seedling leaves was mainly caused by dehydration,whereas that to mature plant leaves was caused by hypersaline *** recovery rate of PSⅡ of seedling leaves was significantly slower than that of the mature plants after the stresses disappeared,which may at least partly contribute to seedling mortality in the *** addition,compared to high light,desiccation seriously inhibited the recovery rate of PSⅡ activities even if the leaves became fully rehydrated to their normal relative water content(RWC)in the following *** inhibited the recovery rate of RC/CS_(M)(reaction center per cross section(at t=t_(Fm)))to decrease the production of assimilatory power,which maybe the cause of the slower PSⅡ recovery in desiccation *** study demonstrates that desiccation particularly coupling with high light have a very negative ef fect on the PSⅡ of *** during low tide and the sensitivity of seedlings and mature plants to desiccation is significantly different,which have important reference significance to choose an appropriate transplanting depth where seedlings and mature plants of *** not only receive sufficient light for growth,but also that minimize desiccation stress during low tide.

关键词： enhalus acoroides high light desiccation photosystemⅡ

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Allelopathic Interactions Between the Tropical Macrophyte enhalus acoroides and Epibenthic HAB Dinoflagellate Prorocentrum concavum

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Journal of Ocean University of China 2022年第6期21卷 1656-1668页

作者： LIU Hui ZOU Jian XIE Hang ZHENG Chengzhi LU Songhui Research Center of Harmful Algae and Marine Biology College of Life Science and TechnologyJinan UniversityGuangzhou 510362China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai 519000China Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

A benthic harmful dinoflagellate bloom caused by Prorocentrum concavum occurred at Xincun Bay,a lagoon characterized by a tropical seagrass ecosystem in the southern China,in summer *** abiotic and biotic factors may affect the abundance dynamics of *** of the biotic factors,allelopathy,is known to be especially common among aquatic species and is suggested to be an economical and environmentally-friendly way to eliminate Benthic Harmful Algal Blooms(BHABs).To investigate the possible allelopathic interactions between seagrasses and ***,a field survey was conducted to study the cell densities of *** on four major substrates over 12 *** laboratory,fresh enhalus acoroides leaves and a crude aqueous extract of dry *** leaves were added to the culture of *** respectively to assess possible effects on the growth and photosynthesis activities of *** *** results showed that the average abundance of *** on *** leaves was statistically lower than that on the sediment outside the seagrass meadow and that on Thalassia hemperichii *** the growth and photosynthesis activities of *** cells were inhibited in the two experiments,which can be attributed to the release and production of allelochemicals by *** results offer new insights into the interaction between the submerged seagrass *** and the benthic harmful algal bloom dinoflagellate ***,which can influence the abundance dynamics of *** and provide an alternative for reducing potential threat of BHABs.

关键词： allelopathy Prorocentrum concavum enhalus acoroides growth photosynthesis inhibition

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Leaching of dissolved organic matter from seagrass leaf litter and its biogeochemical implications

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Acta Oceanologica Sinica 2018年第8期37卷 84-90页

作者： LIU Songlin JIANG Zhijian ZHOU Chenyuan WU Yunchao ARBI Iman ZHANG Jingping HUANG Xiaoping TREVATHAN-TACKETT Stacey M. Key Laboratory of Tropical Marine Bio-resources and Ecology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China University of Chinese Academy of Sciences Beijing 100049China School of Life and Environmental Sciences Centre for Integrative EcologyDeakin UniversityVictoria 3125Australia

Dissolved organic matter（DOM） represents a significant source of nutrients that supports the microbial-based food web in seagrass ecosystems. However, there is little information on how the various fractions of DOM from seagrass leaves contributed to the coastal biogeochemical cycles. To address this gap, we carried out a 30-day laboratory chamber experiment on tropical seagrasses Thalassia hemprichii and enhalus acoroides. After 30 days of incubation, on average 22% carbon（C）, 70% nitrogen（N） and 38% phosphorus（P） of these two species of seagrass leaf litter was released. The average leached dissolved organic carbon（DOC）, dissolved organic nitrogen（DON） and dissolved organic phosphorus（DOP） of these two species of seagrass leaf litter accounted for 55%, 95% and 65% of the total C, N and P lost, respectively. In the absence of microbes, about 75% of the total amount of DOC, monosaccharides（MCHO）, DON and DOP were quickly released via leaching from both seagrass species in the first 9 days. Subsequently, little DOM was released during the remainder of the experiment. The leaching rates of DOC, DON and DOP were approximately 110, 40 and 0.70 μmol/（g·d）. Leaching rates of DOM were attributed to the nonstructural carbohydrates and other labile organic matter within the seagrass leaf. Thalassia hemprichii leached more DOC, DOP and MCHO than E. acoroides. In contrast, E. acoroides leached higher concentrations of DON than T. hemprichii, with the overall leachate also having a higher DON： DOP ratio. These results indicate that there is an overall higher amount of DOM leachate from T. hemprichii than that of E. acoroides that is available to the seagrass ecosystem. According to the logarithmic model for DOM release and the in situ leaf litter production（the Xincun Bay, South China Sea）, the seagrass leaf litter of these two seagrass species could release approximately 4×10~3 mol/d DOC, 1.4×10~3 mol/d DON and 25 mol/d DOP into the seawater. In addition to providing readily a

关键词： dissolved organic matter Thalassia hemprichii enhalus acoroides leaf litter leaching

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