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Journal of Plant Research

Noriaki Tanabe, Masahiro Noshi, Daisuke Mori, Kotaro Nozawa, Masahiro Tamoi, Shigeru Shigeoka
Iron (Fe) is a micronutrient that is essential for plant development and growth. Basic helix-loop-helix (bHLH) transcription factors are a superfamily of transcription factors that are important regulatory components in transcriptional networks in plants. bHLH transcription factors have been divided into subclasses based on their amino acid sequences and domain structures. Among the members of clade IVb (PYE, bHLH121, and bHLH11), the functions of bHLH11 remain unclear. In the present study, we characterized bHLH11 as a negative regulator of Fe homeostasis...
November 11, 2018: Journal of Plant Research
Yasutomo Hoshika, Takayoshi Koike
No abstract text is available yet for this article.
November 7, 2018: Journal of Plant Research
Huanfa Sun, Quan Li, Zhaofeng Lei, Junbo Zhang, Xuzhong Song, Xinzhang Song
The ecological stoichiometry of Moso bamboo (Phyllostachys edulis) during the "explosive growth period" (EGP) remains unknown. In a previous study, we showed that the carbon (C) required by shoots during the EGP is derived from attached mature bamboos. In this study, we attempted to answer the following two questions: (1) Is the nitrogen (N) and phosphorus (P) required by shoots during the EGP also derived from attached mature bamboos? (2) Is the ecological stoichiometry of Moso bamboo during the EGP consistent with the growth rate hypothesis (GRH)? We simultaneously investigated changes in the N and P concentrations and N:P ratios of shoots (young bamboos) and attached mature bamboo over an 11-month period...
November 1, 2018: Journal of Plant Research
Weiwei Wang, Deborah Page-Dumroese, Martin Jurgensen, Joanne Tirocke, Yong Liu
The effects of forest thinning and wood quality on wood decomposition in the mineral soil were investigated in a Chinese pine (Pinus tabuliformis Carriére) plantation in northern China by measuring mass loss and changes in wood properties (carbohydrates, lignin and nitrogen (N) concentrations) in wood stakes of two tree species-loblolly pine (Pinus taeda L.) and trembling aspen (Populus tremuloides Michx.). Stakes were inserted to a 20 cm soil depth in stands with three thinning levels (low, moderate, and heavy) and an unharvested control and removed after 1 year...
October 30, 2018: Journal of Plant Research
Iqmal Asyraf Ilias, Kohei Negishi, Keito Yasue, Naohiro Jomura, Kengo Morohashi, Syarul Nataqain Baharum, Hoe-Han Goh
Expansin is a non-enzymatic protein which plays a pivotal role in cell wall loosening by inducing stress relaxation and extension in the plant cell wall. Previous studies on Arabidopsis, Petunia × hybrida, and tomato demonstrated that the suppression of expansin gene expression reduced plant growth but expansin overexpression does not necessarily promotes growth. In this study, both expansin gene suppression and overexpression in dark-grown transgenic Arabidopsis seedlings resulted in reduced hypocotyl length at late growth stages with a more pronounced effect for the overexpression...
October 19, 2018: Journal of Plant Research
Koichi Takahashi
Natural plant communities are exposed to environmental changes such as global warming and increased human activities. It is thought that alpine and subalpine ecosystems with cool climatic conditions are sensitive to environmental changes. This virtual issue introduces multidisciplinary research at alpine and subalpine plant communities. The articles include research on (1) species diversity, vegetation and biomass, (2) species assembly, (3) climate and growth of alpine plants, (4) reproduction of alpine plants, (5) differences of growth traits among coexisting species, (6) vegetation changes by human activities and overgrazing of deer, and (7) differentiation of growth traits among ecotypes in relation to climatic conditions...
September 27, 2018: Journal of Plant Research
Mark Jonas, Dania Navarro
A key step toward predicting responses to climate change is characterizing genetic variation in populations. While short-term responses will likely be shaped by currently available genetic variation, longer-term evolutionary responses will depend on the supply of novel variation by, ultimately, mutation. Studying mutational contributions to phenotypic variation can provide insights into the extent of potential variation on which selection may operate in future human-altered environments. Here we used the chemical mutagen ethyl methanesulfonate (EMS) to explore mutational contributions to phenotypic variation, integration, and plasticity to elevated carbon dioxide (eCO2 ) in three accessions of Arabidopsis thaliana...
September 25, 2018: Journal of Plant Research
Tetsuto Abe, Nobuyuki Tanaka, Yoshikazu Shimizu
Native forests on oceanic islands are among the most threatened ecosystems. The forests formed on Sekimon uplifted limestone in Haha-jima Island (Ogasawara Islands) have not yet been destroyed by human activities and remain as primary forests harboring several narrow endemic endangered plants. In this paper, we described the plant species diversity, community structure, and status of invasion by alien plants in the mesic forests of Sekimon. The Sekimon forest was characterized by low tree diversity (37 species), high stem density (1731 ha-1 ), and high basal area (63...
September 14, 2018: Journal of Plant Research
Makoto Watanabe, Yu Kamimaki, Marino Mori, Shigeaki Okabe, Izumi Arakawa, Yoshiyuki Kinose, Satoshi Nakaba, Takeshi Izuta
Ozone is an air pollutant that negatively affects photosynthesis in woody plants. Previous studies suggested that ozone-induced reduction in photosynthetic rates is mainly attributable to a decrease of maximum carboxylation rate (Vcmax ) and/or maximum electron transport rate (Jmax ) estimated from response of net photosynthetic rate (A) to intercellular CO2 concentration (Ci ) (A/Ci curve) assuming that mesophyll conductance for CO2 diffusion (gm ) is infinite. Although it is known that Ci -based Vcmax and Jmax are potentially influenced by gm , its contribution to ozone responses in Ci -based Vcmax and Jmax is still unclear...
September 10, 2018: Journal of Plant Research
Tao Fujiwara, Shunsuke Serizawa, Yasuyuki Watano
The Japanese Lepisorus thunbergianus complex contains diploid and tetraploid races of L. thunbergianus and a hexaploid species, L. mikawanus. Here, we performed molecular phylogenetic analysis on this complex to delimit species and to elucidate the evolutionary origins of tetraploid and hexaploid species. Chloroplast DNA (cpDNA) phylogeny supported the monophyly of the complex. Based on a single-copy nuclear gene (PgiC) tree, the tetraploid L. thunbergianus samples could be classified into two variants: an allotetraploid of hybrid origin between diploid L...
August 25, 2018: Journal of Plant Research
Kouki Hikosaka
No abstract text is available yet for this article.
September 2018: Journal of Plant Research
Kotaro T Yamamoto, Masaaki K Watahiki, Jun Matsuzaki, Soichirou Satoh, Hisayo Shimizu
The article Space-time analysis of gravitropism in etiolated Arabidopsis hypocotyls using bioluminescence imaging of the IAA19 promoter fusion with a destabilized luciferase reporter, written by Kotaro T. Yamamoto, Masaaki K. Watahiki, Jun Matsuzaki, Soichirou Satoh and Hisayo Shimizu, was originally published electronically on the publisher's internet portal (currently SpringerLink) on 10 April 2017 without open access.
September 2018: Journal of Plant Research
Kaori Takemura, Hiroyuki Kamachi, Atsushi Kume, Tomomichi Fujita, Ichirou Karahara, Yuko T Hanba
The original article can be found online.
September 2018: Journal of Plant Research
Yamato Yoshida
Chloroplasts (plastids) and mitochondria evolved from endosymbiotic bacteria. These organelles perform vital functions in photosynthetic eukaryotes, such as harvesting and converting energy for use in biological processes. Consistent with their evolutionary origins, plastids and mitochondria proliferate by the binary fission of pre-existing organelles. Here, I review the structures and functions of the supramolecular machineries driving plastid and mitochondrial division, which were discovered and first studied in the primitive red alga Cyanidioschyzon merolae...
September 2018: Journal of Plant Research
Lassina Sanou, Didier Zida, Patrice Savadogo, Adjima Thiombiano
Grazing removes a plant's aboveground vegetative and reproductive tissues and can modify the soil seed bank, potentially impacting the restoration of preferred species. Knowledge about aboveground vegetation and species composition of soil seed bank and the processes that contribute to vegetation recovery on and surrounding watering points subjected to grazing is lacking. Successful restoration strategies hinge on addressing these knowledge gaps. We assessed the effects of livestock grazing on aboveground vegetation and soil seed bank characteristics along a river bank and surrounding areas subject to different grazing intensities and draw implications for restoration...
September 2018: Journal of Plant Research
Shin-Ichi Miyazawa, Mitsuru Nishiguchi, Norihiro Futamura, Tomohisa Yukawa, Mitsue Miyao, Tsuyoshi Emilio Maruyama, Takayuki Kawahara
Glutamine synthetase (GS) localized in the chloroplasts, GS2, is a key enzyme in the assimilation of ammonia (NH3 ) produced from the photorespiration pathway in angiosperms, but it is absent from some coniferous species belonging to Pinaceae such as Pinus. We examined whether the absence of GS2 is common in conifers (Pinidae) and also addressed the question of whether assimilation efficiency of photorespiratory NH3 differs between conifers that may potentially lack GS2 and angiosperms. Search of the expressed sequence tag database of Cryptomeria japonica, a conifer in Cupressaceae, and immunoblotting analyses of leaf GS proteins of 13 species from all family members in Pinidae revealed that all tested conifers exhibited only GS1 isoforms...
September 2018: Journal of Plant Research
José Antonio Fernández Prieto, Mauro Sanna, Álvaro Bueno Sánchez, Joaquín Molero-Mesa, Leonardo Llorens García, Eduardo Cires
The genus Pimpinella L. comprises about 150 species, being one of the largest genera within the family Apiaceae (subfamily Apioideae). Previous molecular phylogenetic studies have shown that Pimpinella is a taxonomically complex group. In this study, evolutionary relationships among representatives from Western Europe have been inferred from phylogenetic analyses of nuclear ribosomal DNA internal transcribed spacer (ITS 1 and ITS 2) and plastid sequences (trnL intron and the trnL-F spacer), with a representative sampling included (168 accessions in the ITS analysis, representing 158 species; and 42 accessions in the cpDNA analysis representing 35 taxa of Pimpinella and closely related species)...
September 2018: Journal of Plant Research
Yuki Tsuchikane, Hiroka Kobayashi, Machi Kato, Juri Watanabe, Jiunn-Tzong Wu, Hiroyuki Sekimoto
Reproductive isolation is essential for the process of speciation. In order to understand speciation, it is necessary to compare one mating group with other phylogenetically related but reproductively isolated groups. The Closterium peracerosum-strigosum-littorale (C. psl.) complex is a unicellular isogamous zygnematophycean alga, which is believed to share a close phylogenetic relationship with the land plants. In this study, we identified a new mating group, named group G, of C. psl. complex and compared its physiological and biochemical characteristics with the mating group I-E, which was closely related to the mating group G...
September 2018: Journal of Plant Research
Li-Jie Li, Xiao-Chen Lu, Huai-Yu Ma, De-Guo Lyu
Soil temperature is known to affect plant growth and productivity. In this study we found that low root-zone temperature (LRT) inhibited the growth of apple (Malus baccata Borkh.) seedlings. To elucidate the molecular mechanism of LRT response, we performed comparative proteome analysis of the apple roots under LRT for 6 days. Total proteins of roots were extracted and separated by two-dimensional gel electrophoresis (2-DE) and 29 differentially accumulated proteins were successfully identified by MALDI-TOF/TOF mass spectrometry...
September 2018: Journal of Plant Research
Hiroyoshi Kubo, Shunsuke Nozawa, Takuma Hiwatashi, Youichi Kondou, Ryo Nakabayashi, Tetsuya Mori, Kazuki Saito, Kojiro Takanashi, Takayuki Kohchi, Kimitsune Ishizaki
R2R3-MYB transcription factors constitute the largest gene family among plant transcription factor families. They became largely divergent during the evolution of land plants and regulate various biological processes. The functions of R2R3-MYBs are mostly characterized in seed plants but are poorly understood in non-seed plants. Here, we examined the function of two R2R3-MYB genes of Marchantia polymorpha (Mapoly0073s0038 and Mapoly0006s0226) that are closely related to subgroup 4 of the R2R3-MYB family. We performed LC/MS/MS metabolomics, RNA-seq analysis and expression analysis in overexpressors and knockout mutants of MpMYB14 and MpMYB02...
September 2018: Journal of Plant Research
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