Article
Plant Sciences
Anzu Minami, Xiaojun Kang, Clay J. Carter
Summary: Nectar volume and sugar composition are critical for plant-pollinator interactions. Cell wall invertases play a key role in determining the sugar composition and volume of nectar, with their activity affecting the attractiveness of nectar to pollinators.
Article
Plant Sciences
Brandi Zenchyzen, Stacie Weissner, Jaymie Martin, Ainsley Lopushinsky, Ida John, Ishnoor Nahal, Jocelyn C. Hall
Summary: Floral nectaries have evolved diverse forms and functions in response to animal pollinators. However, their morphological and developmental characteristics are often overlooked. This study examined the floral nectaries of nine Cleomaceae species and found that they are commonly receptacular, supplied by vasculature, and exhibit significant diversity in size and shape. Floral nectaries contribute to the morphological diversity of Cleomaceae flowers and warrant further investigation into their role in floral evolution.
Article
Plant Sciences
Thomas Goettlinger, Gertrud Lohaus
Summary: The composition of floral nectar varies between different plant species and is influenced by factors such as pollination type and photosynthesis type. The main sugars in nectar and nectaries are glucose, fructose, and sucrose, with higher sugar concentration in nectar compared to nectaries. Amino acids and inorganic ions are selectively retained in nectaries during nectar secretion. Pollination type has a stronger impact on nectar composition than photosynthesis type. Nitrate concentration in leaves is correlated with amino acid concentration in nectaries and nectar of trochilophilous C3 plants.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Evin T. Magner, Rahul Roy, Katrina Freund Saxhaug, Amod Zambre, Kaitlyn Bruns, Emilie C. Snell-Rood, Marshall Hampton, Adrian D. Hegeman, Clay J. Carter
Summary: The black nectar produced by Melianthus flowers is attractive to bird pollinators. The black pigment in the nectar is composed of ellagic acid and iron, and its synthesis involves several chemical reactions. The presence of the black nectar is highly visually attractive to avian pollinators.
Article
Plant Sciences
Elder Antonio Sousa Paiva, Igor Ballego-Campos, Marc Gibernau
Summary: The study found nectaries on tepals and confirmed true nectar secretion in Anthurium andraeanum for the first time. Stigmatic secretion appears to be a distinct substance, challenging previous beliefs, and the often-reported sugar content in stigmatic secretions was likely due to sample contamination. Nectar and stigmatic secretions have been frequently confused in other Anthurium species, warranting a revision for this genus.
AMERICAN JOURNAL OF BOTANY
(2021)
Article
Forestry
Axel Martinsson, Merima Hasani, Hans Theliander
Summary: Oxidation of kraft pulp using hydrogen peroxide can create new functionality of the fibres, but the concentration of hydrogen peroxide must be higher than consumed by the oxidation reactions. This study investigates the consequences of recirculating the oxidation liquid, which leads to an accumulation of transition metal ions. These metal ions can cause the degradation of carbohydrates and rapid consumption of hydrogen peroxide, making it important to carefully control their concentration in the industrial context.
Article
Biochemistry & Molecular Biology
Aura L. C. Parra, Cleverson D. T. Freitas, Pedro F. N. Souza, Patrick von Aderkas, Christoph H. Borchers, Gwyn A. Beattie, Fredy D. A. Silva, Robert W. Thornburg
Summary: This study conducted an extensive peptidomic analysis on the floral nectar of ornamental tobacco and identified several peptides with antimicrobial activity. These peptides, along with proteins and hydrogen peroxide, contribute to plant defense against microorganisms during pollination.
Article
Biochemistry & Molecular Biology
Luis Gutierrez-Rus, Gloria Gamiz-Arco, J. A. Gavira, Eric A. Gaucher, Valeria A. Risso, Jose M. Sanchez-Ruiz
Summary: Enzymes catalyze the chemical reactions of life, and for nearly half of known enzymes, catalysis requires the binding of cofactors. This study identifies heme binding as a potential driver for the formation of ancestral polypeptide-cofactor complexes. Binding of heme to a flexible region in the ancestral structure enhances peroxidation catalysis by protecting the bound heme from degradation processes, resulting in a longer lifetime and higher effective concentration for the catalyst. This finding suggests that the protection of catalytic cofactors by polypeptides is a general mechanism to enhance catalysis and may have benefited primordial polypeptide-cofactor associations.
MOLECULAR BIOLOGY AND EVOLUTION
(2023)
Article
Chemistry, Applied
Haotian Liu, Zhi Wang, Iftikhar Hussain Badar, Qian Liu, Qian Chen, Baohua Kong
Summary: This study found that high-intensity ultrasound combined with hydrogen peroxide can significantly inhibit the thermal aggregation behavior of myofibrillar proteins in water, mainly through H2O2-mediated conversion of cysteine and changes in the myosin structure.
Article
Plant Sciences
Muhammad Ahsan Asghar, Eszter Balogh, Mohamed Ahres, Gabriella Szalai, Orsolya Kinga Gondor, Eva Darko, Peter Borbely, Kitti Kulman, Zsuzsa Mednyanszky, Livia Simon-Sarkadi, Gabor Kocsy
Summary: The study found that the effects of ascorbate and hydrogen peroxide on metabolite profile in wheat differ, leading to changes in the redox environment. Ascorbate inhibits the oxidative pentose phosphate pathway and induces accumulation of certain amino acids, while hydrogen peroxide generates reducing power.
JOURNAL OF PLANT GROWTH REGULATION
(2022)
Article
Plant Sciences
Pavel Pashkovskiy, Yury Ivanov, Alexandra Ivanova, Alexander Kartashov, Ilya Zlobin, Valery Lyubimov, Aleksandr Ashikhmin, Maksim Bolshakov, Vladimir Kreslavski, Vladimir Kuznetsov, Suleyman I. Allakhverdiev
Summary: The effect of different light qualities on the antioxidant system in Pinus sylvestris L. was investigated. Red light increased hydrogen peroxide content and flavonoid accumulation, as well as enhanced the expression of pathogen-related genes. White fluorescent light increased phenol content and overall activity of low-molecular antioxidants. Blue light increased ascorbate and glutathione content but decreased peroxidase activity. These findings suggest that light quality can regulate the accumulation of secondary metabolites, affecting resistance to biotic and abiotic stressors in pines.
Article
Plant Sciences
Mohammad Nur Alam, Li Yang, Xue Yi, Qingfeng Wang, Arif Hasan Khan Robin
Summary: Under heat stress, tall fescue seedlings treated with melatonin exhibited higher physiological indicators and antioxidant enzyme activities, while showing lower production of hydrogen peroxide and malondialdehyde compared to control seedlings. This suggests that exogenous melatonin application can enhance the defense system of tall fescue under heat stress, reduce oxidative damage, and improve growth and physiological activities.
JOURNAL OF PLANT GROWTH REGULATION
(2022)
Article
Physiology
Daniela Esteves Ferreira dos Reis Costa, Ana Leticia Malheiros Silveira, Gianne Paul Campos, Natalia Ribeiro Cabacinha Nobrega, Natalia Ferreira de Araujo, Luciano de Figueiredo Borges, Luciano dos Santos Aggum Capettini, Adaliene Versiani Matos Ferreira, Daniella Bonaventura
Summary: The consumption of a high-carbohydrate diet can lead to increased adiposity, affecting the regulation of vascular tone by perivascular adipose tissue. This effect may be mediated by the activation of the renin-angiotensin system and increased production of nitric oxide and hydrogen peroxide, leading to the opening of potassium channels.
FRONTIERS IN PHYSIOLOGY
(2021)
Article
Plant Sciences
Wenxu Wang, Jiaojiao Zhang, Lijuan Ai, Dan Wu, Bing Li, Lingang Zhang, Liqun Zhao
Summary: This study demonstrates the relationship between CNGC6 and H2O2 in plant responses to heat shock, showing that CNGC6 may stimulate the accumulation of H2O2 in a manner dependent on an increase in cytosolic Ca2+. Additionally, CNGC6 enhances the gene transcription of HS factors and the accumulation of HS proteins via H2O2 to improve plant thermotolerance.
FRONTIERS IN PLANT SCIENCE
(2021)
Article
Multidisciplinary Sciences
Paul T. Morse, Gonzalo Perez-Mejias, Junmei Wan, Alice A. Turner, Inmaculada Marquez, Hasini A. Kalpage, Asmita Vaishnav, Matthew P. Zurek, Philipp P. Huettemann, Katherine Kim, Tasnim Arroum, Miguel A. de la Rosa, Dipanwita Dutta Chowdhury, Icksoo Lee, Joseph S. Brunzelle, Thomas H. Sanderson, Moh H. Malek, David Meierhofer, Brian F. P. Edwards, Irene Diaz-Moreno, Maik Huettemann
Summary: The acetylation of cytochrome c on K39 in ischemic skeletal muscle increases respiration and prevents apoptosis, providing robust resilience to ischemia and ischemia-reperfusion injury. This mechanism is exclusive to skeletal muscle.
NATURE COMMUNICATIONS
(2023)
Article
Biochemistry & Molecular Biology
Dyely C. O. Campos, Andrea S. Costa, Amanda D. R. Lima, Fredy D. A. Silva, Marina D. P. Lobo, Ana Cristina O. Monteiro-Moreira, Renato A. Moreira, Luzia K. A. M. Leal, Diogo Miron, Ilka M. Vasconcelos, Hermogenes D. Oliveira
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2016)
Article
Plant Sciences
Pedro F. N. Souza, Fredy D. A. Silva, Fabricio E. L. Carvalho, Joaquim A. G. Silveira, Ilka M. Vasconcelos, Jose T. A. Oliveira
PLANT CELL REPORTS
(2017)
Article
Plant Sciences
Thiago F. Martins, Ilka M. Vasconcelos, Rodolpho G. G. Silva, Fredy D. A. Silva, Pedro F. N. Souza, Anna L. N. Varela, Louise M. Albuquerque, Jose T. A. Oliveira
JOURNAL OF NATURAL PRODUCTS
(2018)
Article
Plant Sciences
Fredy D. A. Silva, Ilka M. Vasconcelos, Katia D. C. Saraiva, Jose H. Costa, Cleberson F. Fernandes, Jose T. A. Oliverira
JOURNAL OF PLANT PHYSIOLOGY
(2019)
Article
Plant Sciences
Tarcymara B. Garcia, Arlete A. Soares, Jose H. Costa, Helen P. S. Costa, Joao X. S. Neto, Lady Clarissa B. Rocha-Bezerra, Fredy Davi A. Silva, Mariana R. Arantes, Daniele O. B. Sousa, Ilka M. Vasconcelos, Jose T. A. Oliveira
Article
Plant Sciences
Pedro Filho Noronha Souza, Jose Tadeu Abreu Oliveira, Ilka Maria Vasconcelos, Vladimir Goncalves Magalhaes, Fredy Davi Albuquerque Silva, Rodolpho Glauber Guedes Silva, Kleber Sousa Oliveira, Octavio Luis Franco, Joaquim Albenisio Gomes Silveira, Fabricio Eulalio Leite Carvalho
JOURNAL OF PLANT PHYSIOLOGY
(2020)
Article
Biochemical Research Methods
Fredy A. Silva, Adel Guirgis, Patrick von Aderkas, Christoph H. Borchers, Robert Thornburg
JOURNAL OF PROTEOMICS
(2020)
Article
Plant Sciences
Thiago F. Martins, Pedro F. N. Souza, Murilo S. Alves, Fredy Davi A. Silva, Mariana R. Arantes, Ilka M. Vasconcelos, Jose T. A. Oliveira
PLANT CELL REPORTS
(2020)
Article
Biochemistry & Molecular Biology
Fredy A. Silva, Elizabeth C. Chatt, Siti-Nabilla Mahalim, Adel Guirgis, Xingche Guo, Daniel S. Nettleton, Basil J. Nikolau, Robert W. Thornburg
Review
Plant Sciences
Fredy D. A. Silva, Elizabeth P. B. Fontes
Summary: This paper presents recent advances in engineering resistance against plant viruses using the CRISPR/Cas system, as well as the potential of the CRISPR/Cas system for targeting host factors, achieving broad-range resistance, and enhancing immunity. It also outlines the applications, challenges, and perspectives of the CRISPR/Cas system for crop protection.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Biotechnology & Applied Microbiology
Fredy A. Silva, Louise M. Albuquerque, Thiago F. Martins, Jonnanthan A. de Freitas, Ilka M. Vasconcelos, David Queiroz de Freitas, Frederico B. M. B. Moreno, Ana C. O. Monteiro-Moreira, Jose T. A. Oliveira
Summary: A class III peroxidase, Vu-RPOX, was purified from cowpea roots and characterized. Vu-RPOX showed high stability at various temperatures and inhibited the growth of specific fungi.
BIOCATALYSIS AND AGRICULTURAL BIOTECHNOLOGY
(2022)
Review
Virology
Samera S. Breves, Fredy A. Silva, Nivea C. Euclydes, Thaina F. F. Saia, James Jean-Baptiste, Eugenio R. Andrade Neto, Elizabeth P. B. Fontes
Summary: Begomoviruses are intracellular parasites transmitted by whiteflies to dicotyledonous plants, causing significant damage to crops. The transport proteins of the viruses play a crucial role in viral movement within and between cells and in suppressing the host's immune defense. Recent research has focused on viral movement proteins and their interactions with the host transport machinery, expanding our understanding of viral infection pathways.
Article
Biochemistry & Molecular Biology
Patricia G. Castro Landim, Tuana O. Correia, Fredy D. A. Silva, Denise R. Nepomuceno, Helen P. S. Costa, Humberto M. Pereira, Marina D. P. Lobo, Frederico B. M. B. Moreno, Jose Brandao-Neto, Suelen C. Medeiros, Ilka M. Vasconcelos, Jose T. A. Oliveira, Bruno L. Sousa, Ito L. Barroso-Neto, Valder N. Freire, Cristina P. S. Carvalho, Ana C. O. Monteiro-Moreira, Thalles B. Grangeiro