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Journal of Plant Research

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https://www.readbyqxmd.com/read/30218232/plant-species-diversity-community-structure-and-invasion-status-in-insular-primary-forests-on-the-sekimon-uplifted-limestone-ogasawara-islands
#1
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
https://www.readbyqxmd.com/read/30203164/mesophyll-conductance-to-co-2-in-leaves-of-siebold-s-beech-fagus-crenata-seedlings-under-elevated-ozone
#2
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
https://www.readbyqxmd.com/read/30167928/phylogenetic-analysis-reveals-the-origins-of-tetraploid-and-hexaploid-species-in-the-japanese-lepisorus-thunbergianus-polypodiaceae-complex
#3
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
https://www.readbyqxmd.com/read/30066035/cryopreservation-of-marchantia-polymorpha-spermatozoa
#4
Taisuke Togawa, Tohru Adachi, Daijiro Harada, Tasuku Mitani, Daisuke Tanaka, Kimitsune Ishizaki, Takayuki Kohchi, Katsuyuki T Yamato
The liverwort Marchantia polymorpha has become one of the model organisms, since it has less genetic redundancy, sexual and asexual modes of reproduction and a range of genomic and molecular genetic resources. Cryopreservation of fertile spermatozoa eliminates time, space and labor for growing and maintaining male plants in reproductive phase, and also provides an optional way to backup lines. Here we report a protocol to cryopreserve spermatozoa of M. polymorpha in liquid nitrogen. A cryoprotective solution containing sucrose, glycerol and egg yolk and controlled cooling and warming processes led to successful recovery of motile M...
July 31, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/30046937/dependence-of-functional-traits-related-to-growth-rates-and-their-co-2-response-on-multiple-habitat-climate-factors-across-arabidopsis-thaliana-populations
#5
Hiroshi Ozaki, Riichi Oguchi, Kouki Hikosaka
The values of many plant traits are often different even within a species as a result of local adaptation. Here, we studied how multiple climate variables influence trait values in Arabidopsis thaliana grown under common conditions. We examined 9 climate variables and 29 traits related to vegetative growth rate in 44 global A. thaliana accessions grown at ambient or elevated CO2 concentration ([CO2 ]) and applied a multiple regression analysis. We found that genetic variations in the traits related to growth rates were associated with various climate variables...
July 25, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/30032395/staminate-flower-of-prunus-s-l-rosaceae-from-eocene-rovno-amber-ukraine
#6
Dmitry D Sokoloff, Michael S Ignatov, Margarita V Remizowa, Maxim S Nuraliev, Vladimir Blagoderov, Amin Garbout, Evgeny E Perkovsky
The late Eocene ambers provide plethora of animal and plant fossils including well-preserved angiosperm flowers from the Baltic amber. The Rovno amber from NW Ukraine resembles in many aspects the Baltic amber; however, only fossilized animals and some bryophytes have yet been studied from the Rovno amber. We provide the first detailed description of an angiosperm flower from Rovno amber. The flower is staminate with conspicuous hypanthium, double pentamerous perianth and whorled androecium of 24 stamens much longer than the petals...
July 21, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/30008133/nutrient-deficiency-promotes-male-biased-apparent-sex-ratios-at-the-ramet-level-in-the-dioecious-plant-myrica-gale-var-tomentosa-in-oligotrophic-environments-in-bogs
#7
Inoue Mizuki, Kiyoshi Ishida, Masaaki Chiwa, Yoshitoshi Uehara, Ken'ichi Shinozuka, Atsushi Kume
In populations of dioecious plants, the differences in the cost of reproduction between male and female plants can promote a male-biased sex ratio. In this study, we examine the macronutrient levels in tissues of the dioecious wetland shrub Myrica gale to identify the cost of reproduction for male and female plants and to examine the effect of nutrients on the apparent sex ratio at the ramet level. We examined plants across 12 populations of M. gale inhabiting bogs and fens in Japan. For each population, we used line transects to estimate the apparent sex ratio and measured the concentrations of nitrogen (N), phosphorus (P), and potassium (K) in the leaves sampled from male and female plants and in the fruits from female plants...
July 14, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/29992395/why-is-chlorophyll-b-only-used-in-light-harvesting-systems
#8
Atsushi Kume, Tomoko Akitsu, Kenlo Nishida Nasahara
Chlorophylls (Chl) are important pigments in plants that are used to absorb photons and release electrons. There are several types of Chls but terrestrial plants only possess two of these: Chls a and b. The two pigments form light-harvesting Chl a/b-binding protein complexes (LHC), which absorb most of the light. The peak wavelengths of the absorption spectra of Chls a and b differ by c. 20 nm, and the ratio between them (the a/b ratio) is an important determinant of the light absorption efficiency of photosynthesis (i...
July 10, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/29967980/salt-tolerance-mechanisms-in-three-irano-turanian-brassicaceae-halophytes-relatives-of-arabidopsis-thaliana
#9
Roghieh Hajiboland, Sara Bahrami-Rad, Hossein Akhani, Charlotte Poschenrieder
Salt tolerance mechanisms were studied in three Irano-Turanian halophytic species from the Brassicaceae ‎‎(Lepidium latifolium, L. perfoliatum and Schrenkiella parvula) and compared with the glycophyte Arabidopsis thaliana. According to seed germination under salt stress, L. perfoliatum was the most tolerant species, while L. latifolium and S. parvula were rather susceptible. Contrastingly, based on biomass production L. perfoliatum was more salt sensitive than the other two species. In S. parvula biomass was increased up to 2...
July 2, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/29936574/suppression-of-growth-and-death-of-meristematic-tissues-in-abies-sachalinensis-under-strong-shading-comparisons-between-the-terminal-bud-the-terminally-lateral-bud-and-the-stem-cambium
#10
Yuko Yasuda, Yasuhiro Utsumi, Xianfang Tan, Naoaki Tashiro, Kenji Fukuda, Shinya Koga
The suppression of apical growth and radial trunk growth in trees under shade is a key factor in the competition mechanism among individuals in natural and artificial forests. However, the timing of apical and radial growth suppression after shading and the physiological processes involved have not been evaluated precisely. Twenty-one Abies sachalinensis seedlings of 5-years-old were shaded artificially under a relative light intensity of 5% for 70 days from August 1, and the histological changes of the terminal bud and terminally lateral bud of terminal leader and the cambial zone of the trunk base were analyzed periodically...
June 23, 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/30083843/2018-awards-in-the-journal-of-plant-research
#11
EDITORIAL
Kouki Hikosaka
No abstract text is available yet for this article.
September 2018: Journal of Plant Research
https://www.readbyqxmd.com/read/30022268/correction-to-space-time-analysis-of-gravitropism-in-etiolated-arabidopsis-hypocotyls-using-bioluminescence-imaging-of-the-iaa19-promoter-fusion-with-a-destabilized-luciferase-reporter
#12
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
https://www.readbyqxmd.com/read/30022267/correction-to-a-hypergravity-environment-increases-chloroplast-size-photosynthesis-and-plant-growth-in-the-moss-physcomitrella-patens
#13
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
https://www.readbyqxmd.com/read/29948488/the-cellular-machineries-responsible-for-the-division-of-endosymbiotic-organelles
#14
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
https://www.readbyqxmd.com/read/29948487/comparison-of-aboveground-vegetation-and-soil-seed-bank-composition-at-sites-of-different-grazing-intensity-around-a-savanna-woodland-watering-point-in-west-africa
#15
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
https://www.readbyqxmd.com/read/29948486/low-assimilation-efficiency-of-photorespiratory-ammonia-in-conifer-leaves
#16
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
https://www.readbyqxmd.com/read/29948485/polyphyletic-origin-in-pimpinella-apiaceae-evidence-in-western-europe
#17
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
https://www.readbyqxmd.com/read/29948484/identification-of-a-new-mating-group-and-reproductive-isolation-in-the-closterium-peracerosum-strigosum-littorale-complex
#18
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
https://www.readbyqxmd.com/read/29855747/comparative-proteomic-analysis-reveals-the-roots-response-to-low-root-zone-temperature-in-malus-baccata
#19
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
https://www.readbyqxmd.com/read/29845372/biosynthesis-of-riccionidins-and-marchantins-is-regulated-by-r2r3-myb-transcription-factors-in-marchantia-polymorpha
#20
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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