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Mélanie Rich, Pierre-Marc Delaux
No abstract text is available yet for this article.
May 2018: New Phytologist
Siwen Li, Huanmin Niu, Yanan Qiao, Rongxiu Zhu, Yong Sun, Zhaojie Ren, Huiqing Yuan, Yun Gao, Yi Li, Wang Chen, Jinchuan Zhou, Hongxiang Lou
Five new terpenoids (1-5) including two dollabellane-type, one ent-kaurane-type diterpenoids and two sesquiterpenoids were isolated from the Chinese liverwort Lepidozia reptans (L.) Dumort., together with nine known terpenoids (6-14). Their structures were determined on the basis of analysis of MS and NMR spectroscopic data, single-crystal X-ray diffraction and electronic circular dichroism calculations. The selected compounds 1, 2, 6, 7, 9 and 14 were screened for anti-inflammatory activities by the model of LPS-induced nitric oxide (NO) production with macrophage cells, and the mechanism of the active compounds 1 and 2 were further explored...
March 27, 2018: Bioorganic & Medicinal Chemistry
Philip Carella, Anna Gogleva, Marta Tomaselli, Carolin Alfs, Sebastian Schornack
The expansion of plants onto land was a formative event that brought forth profound changes to the earth's geochemistry and biota. Filamentous eukaryotic microbes developed the ability to colonize plant tissues early during the evolution of land plants, as demonstrated by intimate, symbiosis-like associations in >400 million-year-old fossils. However, the degree to which filamentous microbes establish pathogenic interactions with early divergent land plants is unclear. Here, we demonstrate that the broad host-range oomycete pathogen Phytophthora palmivora colonizes liverworts, the earliest divergent land plant lineage...
April 3, 2018: Proceedings of the National Academy of Sciences of the United States of America
Matthew A Gitzendanner, Pamela S Soltis, Gane K-S Wong, Brad R Ruhfel, Douglas E Soltis
PREMISE OF THE STUDY: For the past one billion years, green plants (Viridiplantae) have dominated global ecosystems, yet many key branches in their evolutionary history remain poorly resolved. Using the largest analysis of Viridiplantae based on plastid genome sequences to date, we examined the phylogeny and implications for morphological evolution at key nodes. METHODS: We analyzed amino acid sequences from protein-coding genes from complete (or nearly complete) plastomes for 1879 taxa, including representatives across all major clades of Viridiplantae...
March 30, 2018: American Journal of Botany
Marcelo Pedrosa Gomes, Júlio César Moreira de Brito, Elisa Monteze Bicalho, Janaína Guernica Silva, Maria de Fátima Gomides, Queila Souza Garcia, Cleber Cunha Figueredo
The physiological responses of the aquatic liverwort Ricciocarpus natans to ciprofloxacin (Cipro) exposure under different growth temperatures were investigated. Cipro appears to act as an inhibitor of mitochondrial Complex III by blocking the oxidation of quinol, resulting in the formation of hydrogen peroxide (H2 O2 ). H2 O2 accumulation upon Cipro exposure is responsible for decreased photosynthesis in plants. The amount of H2 O2 in plants is kept under control by antioxidant enzymes, whose activities are central to the responses of plants to Cipro yet are influenced by temperature...
March 19, 2018: Chemosphere
Yuxia Gao, Wenqiang Wang, Tian Zhang, Zhen Gong, Huayao Zhao, Guan-Zhu Han
During plant-pathogen interactions, plants use intracellular proteins with nucleotide-binding site and leucine-rich repeat (NBS-LRR) domains to detect pathogens. NBS-LRR proteins represent a major class of plant disease resistance genes (R-genes). Whereas R-genes have been well characterized in angiosperms, little is known about their origin and early diversification. Here we perform comprehensive evolutionary analyses of R-genes in plants and report the identification of R-genes in basal-branching streptophytes, including charophytes, liverworts, and mosses...
March 21, 2018: Plant Physiology
Keigo Nakamura, Tetsuya Hisanaga, Koichi Fujimoto, Keiji Nakajima, Hirofumi Wada
The female sex organ of the liverwort ( Marchantia polymorpha ) has a characteristic parasol-like form highly suitable for collecting water droplets containing sperm for fertilization. Motivated by this observation and using three-dimensional printing techniques, we develop a parasol-like rigid object that can grab, transport and release water droplets of a maximum size of about 1 cm. By combining experiments and scaling theory, we quantify the object's fundamental wetting and fluid dynamical properties. We construct a stability phase diagram and suggest that it is largely insensitive to properties of liquids such as surface tension and viscosity...
March 2018: Journal of the Royal Society, Interface
Michael Song, Li-Yaung Kuo, Layne Huiet, Kathleen M Pryer, Carl J Rothfels, Fay-Wei Li
PREMISE OF THE STUDY: Gene space in plant plastid genomes is well characterized and annotated, yet we discovered an unrecognized open reading frame (ORF) in the fern lineage that is conserved across flagellate plants. METHODS: We initially detected a putative uncharacterized ORF by the existence of a highly conserved region between rps16 and matK in a series of matK alignments of leptosporangiate ferns. We mined available plastid genomes for this ORF, which we now refer to as ycf94, to infer evolutionary selection pressures and assist in functional prediction...
January 2018: American Journal of Botany
Yi-Feng Wu, Yu Zhao, Xin-Yan Liu, Shuai Gao, Ai-Xia Cheng, Hong-Xiang Lou
Liverworts, a section of the bryophyte plants which pioneered the colonization of terrestrial habitats, produce cyclic bisbibenzyls as a secondary metabolite. These compounds are generated via the phenylpropanoid pathway, similar with flavonoid biosynthesis for which bHLH transcription factors have been identified as one of the improtant regulators in higher plants. Here, a bHLH homolog (PabHLH) was isolated from the liverwort species Plagiochasma appendiculatum and its contribution to bisbibenzyl biosynthesis was explored...
March 8, 2018: Plant & Cell Physiology
Mira Park, Hyun Park, Hyoungseok Lee, Byeong-Ha Lee, Jungeun Lee
Organellar genomes of bryophytes are poorly represented with chloroplast genomes of only four mosses, four liverworts and two hornworts having been sequenced and annotated. Moreover, while Antarctic vegetation is dominated by the bryophytes, there are few reports on the plastid genomes for the Antarctic bryophytes. Sanionia uncinata (Hedw.) Loeske is one of the most dominant moss species in the maritime Antarctic. It has been researched as an important marker for ecological studies and as an extremophile plant for studies on stress tolerance...
March 1, 2018: International Journal of Molecular Sciences
Marko S Sabovljević, Marieluise Weidinger, Aneta D Sabovljević, Wolfram Adlassnig, Ingeborg Lang
Bryophytes are usually taken as good bioindicators. However, they represent a large group of terrestrial plants and they express an enormous range of peculiarities within the plant kingdom. With the aim to search for a common pattern of zinc binding, we established axenical in vitro cultures of a dozen bryophyte species that include hornworts, thallose, and leafy liverworts, as well as acrocarp and pleurocarp mosses. The species were grown free of contaminants for many years prior to the application of different treatments, i...
February 2018: Microscopy and Microanalysis
Huiping Liu, Guoning Li, Bin Zhang, Deqing Sun, Jing Wu, Fang Chen, Feng Kong, Yun Luan, Wen Jiang, Rongmei Wang, Xia Xue
Colorectal cancer (CRC) is a major cause of mortality and morbidity. Chronic inflammation is closely associated with the development, progression and prognosis of the majority of intestinal malignancies. In recent years, targeting the nuclear factor (NF)‑κB signaling pathway for CRC therapy has become an attractive strategy. Riccardin D, a novel macrocyclicbis (bibenzyl) compound, was isolated from the Chinese liverwort plant. Previous studies have suggested that Riccardin D exerted chemo‑preventative effects against the intestinal malignancy formation...
February 16, 2018: Molecular Medicine Reports
Catherine Reeb, Jaap Kaandorp, Fredrik Jansson, Nicolas Puillandre, Jean-Yves Dubuisson, Raphaël Cornette, Florian Jabbour, Yoan Coudert, Jairo Patiño, Jean-François Flot, Alain Vanderpoorten
Morphometrics, the assignment of quantities to biological shapes, is a powerful tool to address taxonomic, evolutionary, functional and developmental questions. We propose a novel method for shape quantification of complex modular architecture in thalloid plants, whose extremely reduced morphologies, combined with the lack of a formal framework for thallus description, have long rendered taxonomic and evolutionary studies extremely challenging. Using graph theory, thalli are described as hierarchical series of nodes and edges, allowing for accurate, homologous and repeatable measurements of widths, lengths and angles...
February 22, 2018: New Phytologist
Mark N Puttick, Jennifer L Morris, Tom A Williams, Cymon J Cox, Dianne Edwards, Paul Kenrick, Silvia Pressel, Charles H Wellman, Harald Schneider, Davide Pisani, Philip C J Donoghue
The evolutionary emergence of land plant body plans transformed the planet. However, our understanding of this formative episode is mired in the uncertainty associated with the phylogenetic relationships among bryophytes (hornworts, liverworts, and mosses) and tracheophytes (vascular plants). Here we attempt to clarify this problem by analyzing a large transcriptomic dataset with models that allow for compositional heterogeneity between sites. Zygnematophyceae is resolved as sister to land plants, but we obtain several distinct relationships between bryophytes and tracheophytes...
February 12, 2018: Current Biology: CB
Hanqing Guo, Nu Wang, Tami R McDonald, Anke Reinders, John M Ward
Plant ammonium transporters in the AMT/MEP/Rh superfamily have only been previously characterized in flowering plants (angiosperms). Plant AMT1s are electrogenic, while plant AMT2s are electroneutral and MEP and Rh transporters in other organisms are electroneutral. We analyzed the transport function of MpAMT1;2 from the basal land plant Marchantia polymorpha, a liverwort. MpAMT1;2 was shown to localize to the plasma membrane in Marchantia gametophyte thallus by stable transformation using a C-terminal citrine fusion...
February 12, 2018: Plant & Cell Physiology
Naoki Minamino, Takehiko Kanazawa, Atsuko Era, Kazuo Ebine, Akihiko Nakano, Takashi Ueda
The RAB GTPase is an evolutionarily conserved machinery component of membrane trafficking, which is the fundamental system for cell viability and higher-order biological functions. The composition of RAB GTPases in each organism is closely related to the complexity and organization of the membrane-trafficking pathway, which has been developed uniquely to realize the organism-specific membrane trafficking system. Comparative genomics has suggested that terrestrialization and/or multicellularization were associated with the expansion of membrane trafficking pathways in green plants, which has yet to be validated in basal land plant lineages...
February 10, 2018: Plant & Cell Physiology
Hai-Na Yu, Xin-Yan Liu, Shuai Gao, Bin Sun, Hong-Bo Zheng, Mei Ji, Ai-Xia Cheng, Hong-Xiang Lou
Chalcone synthases (CHSs) of the type III polyketide synthases (PKSs), catalyze the formation of a tetraketide intermediate from a CoA-tethered starter and malonyl-CoA but use different cyclization mechanisms to produce distinct chemical scaffolds. Herein, we characterized CHS and CHS-like enzymes (designated MpCHS and MpCHSL1, 2 and 3) from Marchantia paleacea and determined the crystal structure of MpCHSL1. MpCHS catalyzed a Claisen condensation to form chalcone, while MpCHSLs catalyzed the formation of lactonized α-pyrones in vitro...
January 31, 2018: Plant Physiology and Biochemistry: PPB
Jessica M Nelson, Duncan A Hauser, Rosemary Hinson, A Jonathan Shaw
Fungal symbioses are ubiquitous in plants, but their effects have mostly been studied in seed plants. This study aimed to assess the diversity of fungal endophyte effects in a bryophyte and identify factors contributing to the variability of outcomes in these interactions. Fungal endophyte cultures and axenic liverwort clones were isolated from wild populations of the liverwort, Marchantia polymorpha. These collections were combined in a gnotobiotic system to test the effects of fungal isolates on the growth rates of hosts under laboratory conditions...
February 7, 2018: New Phytologist
Shohei Yamaoka, Ryuichi Nishihama, Yoshihiro Yoshitake, Sakiko Ishida, Keisuke Inoue, Misaki Saito, Keitaro Okahashi, Haonan Bao, Hiroyuki Nishida, Katsushi Yamaguchi, Shuji Shigenobu, Kimitsune Ishizaki, Katsuyuki T Yamato, Takayuki Kohchi
Land plants differentiate germ cells in the haploid gametophyte. In flowering plants, a generative cell is specified as a precursor that subsequently divides into two sperm cells in the developing male gametophyte, pollen. Generative cell specification requires cell-cycle control and microtubule-dependent nuclear relocation (reviewed in [1-3]). However, the generative cell fate determinant and its evolutionary origin are still unknown. In bryophytes, gametophytes produce eggs and sperm in multicellular reproductive organs called archegonia and antheridia, respectively, or collectively called gametangia...
January 17, 2018: Current Biology: CB
Zongwei Yue, Xinhua Xiao, Jinbao Wu, Xiaozhou Zhou, Weilong Liu, Yaxi Liu, Houhua Li, Guoqiang Chen, Yingli Wu, Xiaoguang Lei
Acute myeloid leukemia (AML) is a hematologic malignancy that is characterized by clonal proliferation of myeloid blasts. Despite the progress that has been made in the treatment of various malignant hematopoietic diseases, the effective treatment of AML remains very challenging. Differentiation therapy has emerged as a promising approach for leukemia treatment, and new and effective chemical agents to trigger the differentiation of AML cells, especially drug-resistant cells, are urgently required. Herein, the natural product jungermannenone C, a tetracyclic diterpenoid isolated from liverworts, is reported to induce cell differentiation in AML cells...
February 2, 2018: Journal of Natural Products
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