Article
Biochemistry & Molecular Biology
Gui-Li Yang, Lei Huang, Xiao Yang, Zhu Li, Hai-Min Liao, Kang Mao, Zhao-Ju Liu, He-Yan Geng, Qin Cao, Ai-Juan Tan
Summary: In this study, the growth, Cd enrichment, and antioxidant enzyme activity of duckweed were investigated under Cd stress. The results showed that both high-Cd-tolerance duckweed (HCD) and low-Cd-tolerance duckweed (LCD) strains hyper-enriched with Cd. Transcriptome analysis revealed significant differences in gene expression between HCD and LCD, with antioxidant system being significantly expressed in HCD but not in LCD. Alpha-linolenic acid metabolism likely plays an important role in Cd detoxification in duckweed. These findings contribute to the understanding of Cd tolerance mechanisms in hyperaccumulator plants and lay the foundation for future phytoremediation studies.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Plant Sciences
Pradeep Kumar Jatav, Raini Verma, Shanker Lal Kothari, Rohit Jain, Sumita Kachhwaha
Summary: Lead accumulation in pearl millet, finger millet, and oat increased with increasing lead concentration, with maximum accumulation in finger millet roots. Different plants showed varying responses to lead toxicity, with finger millet exhibiting higher tolerance.
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
(2021)
Article
Plant Sciences
Viktor Olah, Anna Hepp, Muhammad Irfan, Ilona Meszaros
Summary: This study compared the sensitivity of different chlorophyll fluorescence parameters and found that light-adapted parameters are generally more sensitive than dark-adapted parameters. It is suggested to prioritize light-adapted parameters as endpoints in phytotoxicity assays. Additionally, the study showed that changes in chlorophyll fluorescence parameters may not necessarily reflect plant growth responses, so caution should be exercised when interpreting chlorophyll fluorescence-based endpoints as general proxies for phytotoxic effects.
Article
Environmental Sciences
Xiaoming Wan, Weibin Zeng, Degang Zhang, Lingqing Wang, Mei Lei, Tongbin Chen
Summary: This study investigated the changes in arsenic concentration, distribution, and speciation of the hyperaccumulator Pteris vittata at different growth stages, as well as the differences in metabolic profiling. The results showed that with aging, the redox potential increased in P. vittata, leading to the oxidation of arsenic and impacting its distribution. Furthermore, there was a positive correlation between arsenic concentration and flavonoid compounds.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Jin Xu, Timothy A. Volk, Lindi J. Quackenbush, Stephen V. Stehman
Summary: The study introduced a new model for quantifying shrub willow leaf chlorophyll concentration, incorporating growing degree days as an additional predictor to enhance model performance. This approach provides a practical method for mapping willow leaf chlorophyll concentration using remote sensing technologies, achieving more accurate predictions compared to previous studies.
BIOMASS & BIOENERGY
(2021)
Article
Environmental Sciences
Kyung Min Noh, Hyung-Gyu Lim, Eun Jin Yang, Jong-Seong Kug
Summary: In recent decades, the Arctic Ocean has been warming and freshening, affecting nutrient supply, light availability, chlorophyll, and productivity. Uncertainties in chlorophyll and nutrient projections in Earth system models (ESMs) are found, with greater uncertainty in CMIP6 ESMs compared to CMIP5 ESMs. A strong relationship between background nitrate and projected chlorophyll is identified, and applying this relationship reduces the uncertainty of future chlorophyll projections. The probability of decreasing chlorophyll concentration is increased by approximately 36% after applying the emergent constraint.
Article
Energy & Fuels
Jiaye Zhang, Shijie Zheng, Chongming Chen, Xuebin Wang, Zia Ur Rahman, Houzhang Tan
Summary: Pyrolysis is a key step in biomass thermochemical conversion, and the Bio-CPD model was used to predict pyrolysis products of softwood and hardwood. The study optimized two simplified pyrolysis models and found that the parameters were accurate for simulating biomass pyrolysis at high heating rates.
Article
Green & Sustainable Science & Technology
Kaige Zhao, Wanqing Li, Yingying Yu, Guanyi Chen, Beibei Yan, Zhanjun Cheng, Hai Zhao, Yang Fang
Summary: Bio-oil production from wastewater-treated duckweed by hydrothermal liquefaction (HTL) was studied to investigate the effect of reaction conditions on nitrogen transformation. The highest bio-oil yield of 34.7 wt% was obtained at 360 degrees C, 60 min. The nitrogen in the bio-oil mainly existed as nitrogen-containing heterocycles and amides, with pyrazines and imidazole being the dominant nitrogen species.
Article
Environmental Sciences
Marijana Markovic, Peta A. Neale, Bhanu Nidumolu, Anu Kumar
Summary: This study assessed the adverse effects of four pharmaceuticals and their binary mixtures on Lemna minor, revealing toxic effects for all tested substances with methotrexate being highly toxic. The most sensitive endpoints for binary mixtures were photosynthetic pigments and frond surface area. Synergistic effects were observed in mixtures of methotrexate with fluoxetine or 17 alpha-ethynylestradiol, while mostly additive effects were seen in mixtures with diclofenac. More chronic ecotoxicological data is needed to better understand the environmental risk of methotrexate in surface water.
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
(2021)
Review
Environmental Sciences
Oraleou Sangue Djandja, Linxin Yin, Zhicong Wang, Yao Guo, Xiaoxiao Zhang, Peigao Duan
Summary: Duckweed processing has been recognized as a promising pathway for biofuels production due to its simple harvesting method and high protein or starch content. Biofuels production from duckweed not only addresses energy and environmental issues, but also promotes the effective utilization of duckweed. This critical review focuses on producing bio-oil from duckweed via pyrolysis and hydrothermal liquefaction processes, and discusses the impacts of various parameters on bio-oil properties and distribution.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Candie Xie, Ye Xiao, Chao He, Wen-Shen Liu, Ye-Tao Tang, Shizhong Wang, Antony van der Ent, Jean Louis Morel, Marie-Odile Simonnot, Rong-Liang Qiu
Summary: In this study, a sulfuric acid assisted ethanol fractionation method was developed to separate and purify REE compounds from D. linearis bio-ore and produce value-added chemicals, opening up the possibility for simultaneous recovery of REEs and production of value-added chemicals from REE bio-ore refining.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Cell Biology
Jared J. Stewart, William W. Adams, Marina Lopez-Pozo, Naiara Doherty Garcia, Maureen McNamara, Christine M. Escobar, Barbara Demmig-Adams
Summary: The study demonstrates that duckweed has unique functional characteristics, being able to adapt to different light conditions and exhibiting a combination of traits of fast-growing annuals and slow-growing evergreens.
Article
Chemistry, Multidisciplinary
Xiaoqiang Cui, Xiangming Li, Jianwei Zhang, Qiang Lin, Hui Xiao, Zhanjun Cheng, Beibei Yan, Xiaoe Yang, Guanyi Chen
Summary: The study demonstrated that hydrothermal conversion can achieve the harmless treatment of heavy metal hyperaccumulators and production of bio-oil; high temperature promotes bio-oil yield, and bio-oils derived from S. alfredii have considerable higher heating values.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Environmental Sciences
Ibrahim Ilker Ozyigit, Lutfi Arda, Bestenur Yalcin, Ibrahim Ertugrul Yalcin, Bihter Ucar, Asli Hocaoglu-Ozyigit
Summary: The study found that Lemna minor has high accumulation capability for Cd and Ni, with changes in mineral nutrient status during Cd-Ni treatments. Low genetic polymorphism and high genomic template stability suggest that Lemna minor is a versatile hyperaccumulator.
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
(2021)
Article
Agronomy
Oliva Atiaga, Jenny Ruales, Luis Miguel Nunes, Xose Luis Otero
Summary: In Ecuador's main rice-producing provinces, concentrations of trace toxic metals in soil and rice plants were measured. Some soil samples exceeded legal thresholds for Cr, Cu, and Ni, while concentrations of As, Pb, and Cd were below the established values. Metal concentrations in rice plants did not correlate linearly with soil metal concentrations or their bioavailability. Bioaccumulation factors for As, Cd, Cu, Ni, and Zn could be predicted from bioavailability with power law exponents typical of accumulator plants.