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RISS 인기검색어
- 검색키워드
- 저자 : Qiu Guanglong (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Temporal Variation of Intertidal Seagrass in Southern China (2008–2014)
Guanglong Qiu,Frederick T. Short,Hangqing Fan,Guohua Liu 한국해양과학기술원 2017 Ocean science journal Vol.52 No.3
Understanding the temporal dynamics of seagrasses and the major influences on seagrass growth is critical for seagrass habitat conservation and administration. However, little work has been done regarding these issues in southern China. To examine inter-annual and seasonal variations of the intertidal Halophila ovalis community in southern China, we conducted quarterly sampling using the SeagrassNet methodology and assessed environmental conditions as well as direct anthropogenic impacts on the seagrass meadow from July 2008 to October 2014. Our study demonstrated strong inter-annual and seasonal dynamics of the intertidal seagrass meadow in the study area. Generally, the community performed best (highest seagrass cover, leaf area, shoot density, total biomass) in summer and worst in spring among the 4 seasons. The temporal variations in the seagrass community attributes (e.g. above-ground biomass) were significantly affected by precipitation, atmospheric visibility, and salinity, while leaf width was significantly negatively correlated with temperature, atmospheric visibility and salinity. Temperature was a major factor influencing the seagrass community (both macroalgae and seagrass), with temperature data showing an inverse relationship between seagrass and macroalgae. The above-ground: below-ground biomass ratio and leaf width of H. ovalis were the most sensitive plant parameters monitored when assessing environmental interactions. Human physical disturbances did not have a significant effect on seagrass dynamics in the study area. We concluded that long-term monitoring (like SeagrassNet) is valuable in understanding the relationship between environmental variables and seagrasses.
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Chen Siting,Qiu Guanglong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.6
Salinity afects the physiological activities of seagrass by changing the osmotic pressure of seagrass cells, which then afects the structure and function of seagrass community. In this study, we created transgenic Arabidopsis that overexpressed the ZjGRF1 gene from the intertidal seagrass Zostera japonica. We found that transgenic ZjGRF1 Arabidopsis has stronger tolerance to salt stress and osmotic stress than wild type. Under salt stress, the content of reactive oxygen species in transgenic ZjGRF1 Arabidopsis was lower than that in wild-type Arabidopsis. The viability of root cells in transgenic ZjGRF1 Arabidopsis was higher than that of wild type under salt stress. Under salt stress, transgenic ZjGRF1 Arabidopsis accumulated more proline and had higher antioxidant enzyme activities. The rate of water loss rate from overexpressed plants was lower than that of the wild-type plants. The resistance of overexpressed plants to osmotic stress may be enhanced by the ABA-dependent pathway. Our results confrm that ZjGRF1 enhances tolerance to salt and osmotic stress in Z. japonica.
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Overexpression of the intertidal seagrass J protein ZjDjB1 enhances tolerance to chilling injury
Chen Siting,Qiu Guanglong 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.4
DnaJ proteins act as molecular chaperones to maintain protein homeostasis under stress. However, their role in seagrass remains largely unidentified. We found that the expression of ZjDjB1, a class II J gene of Zostera japonica, was up-regulated under low-temperature stress. Therefore, we cloned ZjDjB1 from Z. japonica, a typical intertidal seagrass. The role of nuclear and cytoplasmic-targeted DnaJ protein (ZjDjB1) in Z. japonica was studied. Under low-temperature stress, the rates of ger- mination and survival of overexpressed Arabidopsis thaliana were higher than those of the wild-type (WT); the root length was longer; the detached leaves were more tolerant to low temperature, and the chlorophyll content of leaves, relative water content and dry weight of shoot were higher. Overexpressed plants accumulated more osmotic protective substances under low-temperature stress, and the antioxidant enzyme activity of overexpressed plants was higher than that of the WT plants. Under low-temperature stress, overexpressed plants accumulated fewer reactive oxygen species. The root cell viability of overexpressed plants was higher than that of WT under low-temperature stress, and there was minimal membrane damage in the overexpressed plants. Furthermore, the level of expression of CBF1 and CBF target genes, including KIN1 and COR15B, was higher in overexpressed plants than that in the WT plants when subjected to low temperature. These results indicate that ZjDjB1 plays an important role in plant resistance to injury under low-temperature stress.
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