Article
Geosciences, Multidisciplinary
F. Giannini, C. R. B. Mendes, C. A. E. Garcia, A. C. O. Carvalho, A. M. Ciotti
Summary: This study compared the variability of photo-physiological parameters in phytoplankton communities at two oceanographic stations in the South Atlantic Subtropical Front and Gyre. It found that Fv/Fm values were related to Chl-a synthesis, indicating more favorable growing conditions, while σPSII varied independently from Fv/Fm and was related to the presence of specific phytoplankton groups. The results suggest the need for more complex models for primary production that include high-resolution fluorescence-derived parameters.
JOURNAL OF MARINE SYSTEMS
(2021)
Article
Environmental Sciences
Flavien Petit, Julia Uitz, Catherine Schmechtig, Celine Dimier, Josephine Ras, Antoine Poteau, Melek Golbol, Vincenzo Vellucci, Herve Claustre
Summary: This study investigates the main sources of natural variability in the in-situ fluorescence signal in the global open ocean, focusing on the influence of phytoplankton community composition. The results show that the phytoplankton community composition plays a key role in the relationship between the in-situ fluorescence signal and Chla concentration.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Agronomy
O-Hyeon Kwon, Hyo-Gil Choi
Summary: This study compared the growth of grafted and non-grafted greenhouse-grown cut rose flowers and found that grafting can improve the photosynthesis rate, transpiration rate, and stomatal conductance, thereby increasing yield. Grafting also improved root activity and resulted in morphological changes such as increased flower size and number of petals.
Article
Agronomy
Renata Tobiasz-Salach, Barbara Stadnik, Dagmara Migut
Summary: Soil salinity has a significant negative impact on the growth and development of barley plants, mainly by disrupting the process of photosynthesis and other plant gas exchange parameters. High salt concentrations lead to a decrease in potassium content in plants, accompanied by an increase in salinity levels.
Article
Biochemistry & Molecular Biology
Andrzej Skoczowski, Jakub Oliwa, Iwona Stawoska, Magdalena Rys, Maciej Kocurek, Ilona Czyczylo-Mysza
Summary: The study investigated the effects of ozone combined with different spectral compositions on photosynthesis and pigment composition in Chinese cabbage leaves. The results demonstrated that the spectral composition significantly influenced the response of Chinese cabbage to ozone, leading to variations in photosynthetic activity and pigment content.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Environmental Sciences
Giuseppe Maniaci, Robert J. W. Brewin, Shubha Sathyendranath
Summary: This study developed an extended method to indirectly determine the nitrogen (N) and carbon (C) content of phytoplankton samples and calculate the C:N ratio. The estimated values of phytoplankton C and N were consistent with literature values, validating the approach. The method can also be applied to remote sensing data to map the geographical distribution of phytoplankton elements.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Fenfen Liu, Shilin Tang
Summary: By investigating the intraseasonal chlorophyll oscillations in the western South China Sea during summer, it is found that there is a double-bloom pattern and the oscillations are related to upwelling and an eddy dipole.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Y. Wang, L. Suarez, T. Poblete, V Gonzalez-Dugo, D. Ryu, P. J. Zarco-Tejada
Summary: This study investigated the combination of different hyperspectrally derived proxies for leaf nitrogen (N) to assess N status in a 1200-ha almond orchard across two growing seasons. The results showed that the RTM-based chlorophyll a + b content and solar-induced fluorescence (SIF) were the most important and consistent predictors for leaf N compared to other leaf biochemical and biophysical traits. The combination of non-collinear SIF and chlorophyll a + b content significantly improved the predictions of leaf N variability.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Geosciences, Multidisciplinary
Jianhuang Qin, Ze Meng, Wenlong Xu, Baosheng Li, Xuhua Cheng, Raghu Murtugudde
Summary: This study diagnoses the drivers of intraseasonal variability of mixed layer chlorophyll-a (Chl) concentration in the tropical Indian Ocean during boreal summer using a well-tested coupled ocean-ecosystem model. Wind forcing is identified as the primary source for energetic intraseasonal Chl concentration variability in the eastern Arabian Sea and western Bay of Bengal, modulated by the Central Indian Ocean mode.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Marine
Hyeonji Bae, Dabin Lee, Jae Joong Kang, Jae Hyung Lee, Naeun Jo, Kwanwoo Kim, Hyo Keun Jang, Myung Joon Kim, Jae-Il Kwon, Sang Heon Lee
Summary: The protein concentration of phytoplankton plays a crucial role in the growth of higher trophic levels and the balance of oceanic food webs. Developing an algorithm to estimate protein concentration and monitor spatiotemporal variations is essential for long-term monitoring of climate-related ecosystem changes in the East/Japan Sea (EJS). Further improvement of the algorithm through continuous field surveys is necessary for a better understanding of spatiotemporal variation in protein concentration.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Environmental Sciences
Nicholas Bock, Ajit Subramaniam, Andrew R. Juhl, Joseph Montoya, Solange Duhamel
Summary: Marine phytoplankton play a central role in global biogeochemical cycling and carbon export. This study presents a method for measuring picophytoplankton per-cell chlorophyll a in field samples and demonstrates its accuracy in determining the chlorophyll a content of different phytoplankton groups.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Limnology
Klara K. E. Wolf, Sebastian D. Rokitta, Clara J. M. Hoppe, Bjorn Rost
Summary: Sea ice retreat and other factors are changing the conditions for primary producers in the Arctic Ocean, but research on their strategies and performance is limited. This study investigated the responses of two diatom species to light and CO2 levels and found that their abilities and strategies differ.
LIMNOLOGY AND OCEANOGRAPHY
(2022)
Article
Environmental Sciences
Na Wang, Peiqi Yang, Jan G. P. W. Clevers, Sebastian Wieneke, Lammert Kooistra
Summary: In this study, the effects of water stress on sun-induced chlorophyll fluorescence (SIF) were investigated using an Unmanned Aerial Vehicle (UAV). The results showed that both physiological and non-physiological factors influenced SIF variations caused by water stress, but the contribution of non-physiological factors was relatively small.
REMOTE SENSING OF ENVIRONMENT
(2023)
Article
Plant Sciences
Tao Wang, Lingyu Li, Yalong Qin, Bo Lu, Donghuan Xu, Weibing Zhuang, Xiaochun Shu, Fengjiao Zhang, Ning Wang, Zhong Wang
Summary: Taxus is a rare and endangered woody plant with important economic and ecological values. The photosynthetic activity of Taxus species is sensitive to environmental conditions, which affect its growth and development. The seasonal dynamics of chlorophyll fluorescence and key physiological parameters were studied in T. media and T. mairei. The results showed that the photosynthetic activity of both species was influenced by light intensity and air temperature, which disturbed the electron transport chain and caused damage in winter.
Article
Environmental Sciences
Hongjin Qiao, Shasha Zang, Fang Yan, Zhiguang Xu, Lei Wang, Hongyan Wu
Summary: The study found that the larger diatom Thalassiosira weissflogii can maintain photosynthetic activity for a longer period under nitrogen starvation compared to the smaller diatom Thalassiosira pseudonana, which is more sensitive to high light. Both diatoms showed inhibited electron transfer reactions, with fast closing of reaction centers promoting the development of non-reducing PSII centers.
MARINE ENVIRONMENTAL RESEARCH
(2021)
