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https://www.readbyqxmd.com/read/28299575/phylogenetic-constrains-on-mycorrhizal-specificity-in-eight-dendrobium-orchidaceae-species
#1
Xiaoke Xing, Xueting Ma, Jinxin Men, Yanhong Chen, Shunxing Guo
Plant phylogeny constrains orchid mycorrhizal (OrM) fungal community composition in some orchids. Here, we investigated the structures of the OrM fungal communities of eight Dendrobium species in one niche to determine whether similarities in the OrM fungal communities correlated with the phylogeny of the host plants and whether the Dendrobium-OrM fungal interactions are phylogenetically conserved. A phylogeny based on DNA data was constructed for the eight coexisting Dendrobium species, and the OrM fungal communities were characterized by their roots...
March 13, 2017: Science China. Life Sciences
https://www.readbyqxmd.com/read/28280565/predicting-evolution-in-response-to-climate-change-the-example-of-sprouting-probability-in-three-dormancy-prone-orchid-species
#2
Richard P Shefferson, Ryo Mizuta, Michael J Hutchings
Although many ecological properties of species respond to climate change, their evolutionary responses are poorly understood. Here, we use data from long-term demographic studies to predict evolutionary responses of three herbaceous perennial orchid species, Cypripedium parviflorum, C. candidum and Ophrys sphegodes, to predicted climate changes in the habitats they occupy. We focus on the evolution of sprouting probability, because all three species exhibit long-term vegetative dormancy, i.e. individual plants may not emerge above-ground, potentially for several consecutive years...
January 2017: Royal Society Open Science
https://www.readbyqxmd.com/read/28275885/development-of-polyspermic-zygote-and-possible-contribution-of-polyspermy-to-polyploid-formation-in-angiosperms
#3
Takashi Okamoto, Yukinosuke Ohnishi, Erika Toda
Fertilization is a general feature of eukaryotic uni- and multicellular organisms to restore a diploid genome from female and male gamete haploid genomes. In angiosperms, polyploidization is a common phenomenon, and polyploidy would have played a major role in the long-term diversification and evolutionary success of plants. As for the mechanism of formation of autotetraploid plants, the triploid-bridge pathway, crossing between triploid and diploid plants, is considered as a major pathway. For the emergence of triploid plants, fusion of an unreduced gamete with a reduced gamete is generally accepted...
March 8, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28271308/genetic-structure-of-a-regionally-endangered-orchid-the-dark-red-helleborine-epipactis-atrorubens-at-the-edge-of-its-distribution
#4
Hilde Hens, Anne Jäkäläniemi, Kadri Tali, Petr Efimov, Alexey V Kravchenko, Laura Kvist
The genetic structure and diversity of species is determined by both current population dynamics and historical processes. Population genetic structure at the edge of the distribution is often expected to differ substantially from populations at the centre, as these edge populations are often small and fragmented. In addition, populations located in regions that have experienced repeated glaciations throughout the Pleistocene, may still carry imprints from the genetic consequences of frequent distribution shifts...
March 7, 2017: Genetica
https://www.readbyqxmd.com/read/28263365/plasticity-in-n-uptake-among-sympatric-species-with-contrasting-nutrient-acquisition-strategies-in-a-tropical-forest
#5
Kelly M Andersen, Jordan R Mayor, Benjamin L Turner
Nitrogen (N) availability influences the productivity and distribution of plants in tropical montane forests. Strategies to acquire soil N, such as direct uptake of organic compounds or associations with root symbionts to enhance N acquisition in exchange for carbon (C), may facilitate plant species coexistence and ecosystem N retention. Alternatively, rapid microbial turnover of soil N forms in tropical soils might promote flexible plant N-uptake strategies and mediate species coexistence. We tested whether sympatric plant species with divergent root symbiont associations, and therefore potentially different nutrient acquisition strategies, partition chemical forms of N or show plasticity in N uptake in a tropical pre-montane forest in Panama...
March 6, 2017: Ecology
https://www.readbyqxmd.com/read/28258650/concomitant-loss-of-ndh-complex-related-genes-within-chloroplast-and-nuclear-genomes-in-some-orchids
#6
Choun-Sea Lin, Jeremy J W Chen, Chi-Chou Chiu, Han C W Hsiao, Chen-Jui Yang, Xiao-Hua Jin, James Leebens-Mack, Claude W dePamphilis, Yao-Ting Huang, Ling-Hung Yang, Wan-Jung Chang, Ling Kui, Gane Ka-Shu Wong, Jer-Ming Hu, Wen Wang, Ming-Che Shih
Chloroplast NAD(P)H dehydrogenase-like (NDH) complex consists of ~30 subunits from both the nuclear and chloroplast genomes and is ubiquitous across most land plants. In some orchids, such as Phalaenopsis equestris, Dendrobium officinale and D. catenatum, most of the 11 chloroplast genome encoded ndh genes (cp-ndh) have been lost. Here we investigated whether functional cp-ndh genes have been completely lost in these orchids or whether they have been transferred and retained in the nuclear genomes. Further, we assessed whether both cp-ndh genes and nucleus-encoded NDH-related genes can be lost resulting in the absence of the NDH complex...
March 4, 2017: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28250593/assessment-of-genetic-diversity-among-four-orchids-based-on-ddrad-sequencing-data-for-conservation-purposes
#7
Subhas Chandra Roy, Kaushik Moitra, Dilip De Sarker
Genetic diversity was assessed in the four orchid species using NGS based ddRAD sequencing data. The assembled nucleotide sequences (fastq) were deposited in the SRA archive of NCBI Database with accession number (SRP063543 for Dendrobium, SRP065790 for Geodorum, SRP072201 for Cymbidium and SRP072378 for Rhynchostylis). Total base pair read was 1.1 Mbp in case of Dendrobium sp., 553.3 Kbp for Geodorum sp., 1.6 Gbp for Cymbidium, and 1.4 Gbp for Rhynchostylis. Average GC% was 43.9 in Geodorum, 43.7% in Dendrobium, 41...
January 2017: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/28240377/interaction-intensity-and-pollinator-mediated-selection
#8
Judith Trunschke, Nina Sletvold, Jon Ågren
In animal-pollinated plants, the opportunity for selection and the strength of pollinator-mediated selection are expected to increase with the degree of pollen limitation. However, whether differences in pollen limitation can explain variation in pollinator-mediated and net selection among animal-pollinated species is poorly understood. In the present study, we quantified pollen limitation, variance in relative fitness and pollinator-mediated selection on five traits important for pollinator attraction (flowering start, plant height, flower number, flower size) and pollination efficiency (spur length) in natural populations of 12 orchid species...
February 27, 2017: New Phytologist
https://www.readbyqxmd.com/read/28222700/quantitative-evaluation-of-protocorm-growth-and-fungal-colonization-in-bletilla-striata-orchidaceae-reveals-less-productive-symbiosis-with-a-non-native-symbiotic-fungus
#9
Tatsuki Yamamoto, Chihiro Miura, Masako Fuji, Shotaro Nagata, Yuria Otani, Takahiro Yagame, Masahide Yamato, Hironori Kaminaka
BACKGROUND: In nature, orchid plants depend completely on symbiotic fungi for their nutrition at the germination and the subsequent seedling (protocorm) stages. However, only limited quantitative methods for evaluating the orchid-fungus interactions at the protocorm stage are currently available, which greatly constrains our understanding of the symbiosis. Here, we aimed to improve and integrate quantitative evaluations of the growth and fungal colonization in the protocorms of a terrestrial orchid, Blettila striata, growing on a plate medium...
February 21, 2017: BMC Plant Biology
https://www.readbyqxmd.com/read/28217096/gymnadenia-conopsea-l-r-br-a-systemic-review-of-the-ethnobotany-phytochemistry-and-pharmacology-of-an-important-asian-folk-medicine
#10
REVIEW
Xiaofei Shang, Xiao Guo, Yu Liu, Hu Pan, Xiaolou Miao, Jiyu Zhang
Gymnadenia conopsea (L.) R. Br. (Orchidaceae) is a perennial herbaceous orchid plant that grows widely throughout Europe and in temperate and subtropical zones of Asia. In China, its tuber has been used in traditional Chinese medicines, Tibetan medicines, Mongolian medicines and other ethnic medicines, and taken to treat numerous health conditions. The present paper provides a review of the traditional uses, phytochemistry, biological activities, and toxicology to highlight the future prospects of the plant...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28195549/dendrobium-chrysanthum-ethanolic-extract-induces-apoptosis-via-p53-up-regulation-in-hela-cells-and-inhibits-tumor-progression-in-mice
#11
Ritika Prasad, Nishant Kumar Rana, Biplob Koch
Background Dendrobium is one of the diverse genus of orchid plants. It possesses a number of pharmacological activities and has long been used in traditional system of medicine. The goal of this study was to investigate the apoptosis inducing property of the ethanolic extract from the leaves of Dendrobium chrysanthum, a species of Dendrobium whose anticancer role has not been ascertained yet. Methods To evaluate the anticancer activity of the ethanolic extract of D. chrysanthum in vitro in HeLa (human cervical cancer) cells, cytotoxic activity, generation of reactive oxygen species (ROS), induction of apoptosis and effect on cell cycle were determined...
February 14, 2017: Journal of Complementary & Integrative Medicine
https://www.readbyqxmd.com/read/28168103/in-situ-morphometric-survey-elucidates-the-evolutionary-systematics-of-the-eurasian-himantoglossum-clade-orchidaceae-orchidinae
#12
Richard M Bateman, Attila Molnár V, Gábor Sramkó
BACKGROUND AND AIMS: The charismatic Himantoglossum s.l. clade of Eurasian orchids contains an unusually large proportion of taxa that are of controversial circumscriptions and considerable conservation concern. Whereas our previously published study addressed the molecular phylogenetics and phylogeography of every named taxon within the clade, here we use detailed morphometric data obtained from the same populations to compare genotypes with associated phenotypes, in order to better explore taxonomic circumscription and character evolution within the clade...
2017: PeerJ
https://www.readbyqxmd.com/read/28160857/eulophia-macrobulbon-an-orchid-with-significant-anti-inflammatory-and-antioxidant-effect-and-anticancerogenic-potential-exerted-by-its-root-extract
#13
Roswitha Schuster, Laura Zeindl, Wolfgang Holzer, Nattakanwadee Khumpirapang, Siriporn Okonogi, Helmut Viernstein, Monika Mueller
BACKGROUND: The Orchidaceae family is one of the largest families of flowering plants. Orchids are widely used for the traditional herbal medicine, acting as aphrodisiac, antisepic, antimicrobial, anti-cancer agent, etc. PURPOSE: This study was designed to elucidate the anti-inflammatory, antioxidant and cytotoxic potential of a 50% ethanolic extract of Eulophia macrobulbon roots (EME) in vitro, an orchid growing in Southern Asia. Furthermore, the main active compounds were isolated, and the bioactivity of the single constituents was determined...
January 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28146332/effects-of-distance-from-models-on-the-fitness-of-floral-mimics
#14
K J Duffy, S D Johnson
Rewardless plants can attract pollinators by mimicking floral traits of rewarding heterospecific plants. This should result in the pollination success of floral mimics being dependent on the relative abundance of their models, as pollinator abundance and conditioning on model signals should be higher in the vicinity of the models. However, the attraction of pollinators to signals of the models may be partially innate, such that spatial isolation of mimics from model species may not strongly affect pollination success of mimics...
February 1, 2017: Plant Biology
https://www.readbyqxmd.com/read/28144949/blown-by-the-wind-the-ecology-of-male-courtship-display-behavior-in-orchid-bees
#15
Tamara Pokorny, Ira Vogler, René Losch, Patrick Schlütting, Pedro Juarez, Nicolai Bissantz, Santiago R Ramírez, Thomas Eltz
Many insects rely on chemical signals to transmit precise information on the location, identity, and quality of potential mates. Chemical signals are often broadcasted at sites with physical properties that maximize signal propagation and signal transmision. Male neotropical orchid bees (Euglossini) perch and display on vertical branches and tree trunks in the forest to expose volatile blends (perfumes) that they previously collected from their environment. Previous studies have shown that the chemical composition of perfume blends is highly differentiated even between closely related species...
February 1, 2017: Ecology
https://www.readbyqxmd.com/read/28141838/when-it-pays-to-cheat-examining-how-generalized-food-deception-increases-male-and-female-fitness-in-a-terrestrial-orchid
#16
Ryan P Walsh, Helen J Michaels
BACKGROUND: Experimental manipulations of floral nectar in food deceptive species can reveal insights into the evolutionary consequences of the deceptive strategy. When coupled to pollen tracking, the effects of the deceptive pollination syndrome on both male and female reproductive success may be quantified. Attraction of pollinators in deceit-pollinated species often relies on producing a conspicuous floral display which may increase visibility to pollinators, but in-turn may increase within plant selfing...
2017: PloS One
https://www.readbyqxmd.com/read/28131062/anthocyanin-biosynthesis-regulation-of-dhmyb2-and-dhbhlh1-in-dendrobium-hybrids-petals
#17
Chonghui Li, Jian Qiu, Ling Ding, Mingzhong Huang, Surong Huang, Guangsui Yang, Junmei Yin
Dendrobium hybrids orchid are popular throughout the world. They have various floral color and pigmentation patterns that are mainly caused by anthocyanins. It is well established that anthocyanin biosynthesis is regulated by the interplay between MYB and bHLH transcription factors (TF) in most plants. In this study, we identified one R2R3-MYB gene, DhMYB2, and one bHLH gene, DhbHLH1, from a Dendrobium hybrid. Their expression profiles were related to anthocyanin pigmentation in Dendrobium petals. Transient over-expression of these two TF genes showed that both DhMYB2 and DhbHLH1 resulted in anthocyanin production in white petals...
March 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/28111366/orchidstra-2-0-a-transcriptomics-resource-for-the-orchid-family
#18
Ya-Ting Chao, Shao-Hua Yen, Jen-Hau Yeh, Wan-Chieh Chen, Ming-Che Shih
Orchidaceae, the orchid family, encompasses more than 25,000 species and five subfamilies. Due to their beautiful and exotic flowers, distinct biological and ecological features, orchids have aroused wide interest among both researchers and the general public. We constructed the Orchidstra database, a resource for orchid transcriptome assembly and gene annotations. The Orchistra database has been under active development since 2013. To accommodate the increasing amount of orchid transcriptome data and house more comprehensive information, Orchidstra 2...
January 22, 2017: Plant & Cell Physiology
https://www.readbyqxmd.com/read/28100022/mycorrhizal-specificity-does-not-limit-the-distribution-of-an-endangered-orchid-species
#19
Michael Waud, Rein Brys, Wouter Van Landuyt, Bart Lievens, Hans Jacquemyn
What factors determine the distribution of a species is a central question in ecology and conservation biology. In general, the distribution of plant species is assumed to be controlled by dispersal or environmentally controlled recruitment. For plant species which are critically dependent on mycorrhizal symbionts for germination and seedling establishment, specificity in mycorrhizal associations and availability of suitable mycorrhizal fungi can be expected to have a major impact on successful colonization and establishment and thus ultimately on a species distribution...
January 18, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28099773/comparison-of-green-and-albino-individuals-of-the-partially-mycoheterotrophic-orchid-epipactis-helleborine-on-molecular-identities-of-mycorrhizal-fungi-nutritional-modes-and-gene-expression-in-mycorrhizal-roots
#20
Kenji Suetsugu, Masahide Yamato, Chihiro Miura, Katsushi Yamaguchi, Kazuya Takahashi, Yoshiko Ida, Shuji Shigenobu, Hironori Kaminaka
Some green orchids obtain carbon from their mycorrhizal fungi, as well as from photosynthesis. These partially mycoheterotrophic orchids sometimes produce fully achlorophyllous, leaf-bearing (albino) variants. Comparing green and albino individuals of these orchids will help to uncover the molecular mechanisms associated with mycoheterotrophy. We compared green and albino Epipactis helleborine by molecular barcoding of mycorrhizal fungi, nutrient sources based on (15) N and (13) C abundances and gene expression in their mycorrhizae by RNA-seq and cDNA de novo assembly...
January 18, 2017: Molecular Ecology
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