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https://www.readbyqxmd.com/read/28534179/spines-vs-microspines-an-overview-of-the-sculpture-exine-in-selected-basal-and-derived-asteraceae-with-focus-on-asteroideae
#1
María C Tellería
This study presents a detailed examination of the echinate and microechinate sculpturing in relation to the size of pollen grains in 31 selected species of Asteraceae belonging to the subfamilies Barnadesioideae, Mutisioideae, Carduoideae and Asteroideae. The aims were to recognize sculpturing patterns, under LM and SEM, within large and small pollen of both basal and derived species and to explore the features that could have taxonomic value to apply in palynological disciplines. The detailed examination of the exine surface showed both the relevance and limits of sculptural patterns for taxonomy...
May 22, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28532421/glutamate-excitotoxicity-induced-by-orally-administered-propionic-acid-a-short-chain-fatty-acid-can-be-ameliorated-by-bee-pollen
#2
Afaf El-Ansary, Huda S Al-Salem, Alqahtani Asma, Abeer Al-Dbass
BACKGROUND: Rodent models may guide investigations towards identifying either environmental neuro-toxicants or drugs with neuro-therapeutic effects. This work aims to study the therapeutic effects of bee pollen on brain glutamate excitotoxicity and the impaired glutamine-glutamate- gamma amino butyric acid (GABA) circuit induced by propionic acid (PPA), a short chain fatty acid, in rat pups. METHODS: Twenty-four young male Western Albino rats 3-4 weeks of age, and 45-60 g body weight were enrolled in the present study...
May 22, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28532028/newly-isolated-sporopollenin-microcages-from-platanus-orientalis-pollens-as-a-vehicle-for-controlled-drug-delivery
#3
Muhammad Mujtaba, Idris Sargin, Lalehan Akyuz, Talip Ceter, Murat Kaya
Sporopollenin microcages were produced from the pollens of Platanus orientalis. Paracetamol was loaded into the microcages. Pollen, sporopollenin, paracetamol and paracetamol-loaded sporopollenin microcages were characterized with FT-IR, TGA and SEM. The analytical analyses demonstrated that sporopollenin microcages were structurally intact, highly reticulated and thermally stable. The loading efficiency of the sporopollenin microcages was found to be 8.2% using the passive loading technique and 23.7% via evaporating loading technique...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531958/unique-postglacial-evolution-of-the-hornbeam-carpinus-betulus-l-in-the-carpathians-and-the-balkan-peninsula-revealed-by-chloroplast-dna
#4
Dragoş Postolache, Flaviu Popescu, Ladislav Paule, Dalibor Ballian, Peter Zhelev, Sorina Fărcaş, Juraj Paule, Ovidiu Badea
The Balkan Peninsula is one of the largest and most important European glacial refugia. However, the evolutionary history and phylogeographic pattern of temperate tree species that survived in the Balkans glacial refugia and their contribution to the genetic structure of the current population in the Carpathian Mountains remains poorly understood. Using polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP), and extensive population sampling, we explored the phylogeographic pattern of Carpinus betulus in both the Balkan Peninsula and the Carpathian region...
May 17, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28531293/effect-of-expanded-variation-in-anther-position-on-pollinator-visitation-to-wild-radish-raphanus-raphanistrum
#5
Yuval Sapir, Keith Karoly, Vanessa A Koelling, Heather F Sahli, Frances N Knapczyk, Jeffrey K Conner
Background and Aims: Plant-pollinator interactions shape the evolution of flowers. Floral attraction and reward traits have often been shown to affect pollinator behaviour, but the possible effect of efficiency traits on visitation behaviour has rarely been addressed. Anther position, usually considered a trait that influences efficiency of pollen deposition on pollinators, was tested here for its effect on pollinator visitation rates and visit duration in flowers of wild radish, Raphanus raphanistrum ...
May 22, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28528483/fossil-record-of-ephedra-in-the-lower-cretaceous-aptian-argentina
#6
Gabriela G Puebla, Ari Iglesias, María A Gómez, Mercedes B Prámparo
Fossil plants from the Lower Cretaceous (upper Aptian) of the La Cantera Formation, Argentina, are described. The fossils studied represent a leafy shooting system with several orders of articulated and striated axes and attached leaves with unequivocal ephedroid affinity. We also found associated remains of ovulate cones with four whorls of sterile bracts, which contain two female reproductive units (FRU). Ovulate cone characters fit well within the genus Ephedra. Special characters in the ovulate cones including an outer seed envelope with two types of trichomes, allowed us to consider our remains as a new Ephedra species...
May 20, 2017: Journal of Plant Research
https://www.readbyqxmd.com/read/28527153/the-rise-of-phenology-with-climate-change-an-evaluation-of-ijb-publications
#7
Alison Donnelly, Rong Yu
In recent decades, phenology has become an important tool by which to measure both the impact of climate change on ecosystems and the feedback of ecosystems to the climate system. However, there has been little attempt to date to systematically quantify the increase in the number of scientific publications with a focus on phenology and climate change. In order to partially address this issue, we examined the number of articles (original papers, reviews and short communications) containing the terms 'phenology' and 'climate change' in the title, abstract or keywords, published in the International Journal of Biometeorology in the 60 years since its inception in 1957...
May 19, 2017: International Journal of Biometeorology
https://www.readbyqxmd.com/read/28526911/dynamics-of-post-translationally-modified-histones-during-barley-pollen-embryogenesis-in-the-presence-or-absence-of-the-epi-drug-trichostatin-a
#8
Pooja Pandey, Diaa S Daghma, Andreas Houben, Jochen Kumlehn, Michael Melzer, Twan Rutten
Improving pollen embryogenesis. Despite the agro-economic importance of pollen embryogenesis, the mechanisms underlying this process are still poorly understood. We describe the dynamics of chromatin modifications (histones H3K4me2, H3K9ac, H3K9me2, and H3K27me3) and chromatin marks (RNA polymerase II CDC phospho-Ser5, and CENH3) during barley pollen embryogenesis. Immunolabeling results show that, in reaction to stress, immature pollen rapidly starts reorganizing several important chromatin modifications indicative of a change in cell fate...
May 19, 2017: Plant Reproduction
https://www.readbyqxmd.com/read/28520767/ms26-cyp704b-is-required-for-anther-and-pollen-wall-development-in-bread-wheat-triticum-aestivum-l-and-combining-mutations-in-all-three-homeologs-causes-male-sterility
#9
Manjit Singh, Manish Kumar, Katherine Thilges, Myeong-Je Cho, A Mark Cigan
Development of anthers and pollen represents an important aspect of the life cycle in flowering plants. Genes contributing to anther and pollen development have been widely studied in many plant species. Ms26/CYP704B genes play an important role in pollen development through biosynthesis of sporopollenin for pollen exine formation. To investigate the role of Ms26/CYP704B genes in anther and pollen development of bread wheat, mutations in the A-, B-, and D-homeologs of the putative Ms26/CYP704B gene were analyzed...
2017: PloS One
https://www.readbyqxmd.com/read/28518538/how-does-the-pattern-of-aeroallergen-sensitization-change-over-time-across-all-ages
#10
Ji-Hyeon Shin, Dong-Hee Lee
BACKGROUND: Identification of aeroallergen sensitization is important for diagnosis and management of allergic diseases. Immunoglobulin E (IgE) sensitization status is known to change over time. However, few studies have explored changes in sensitization patterns across all age groups. The aim of the present study was to evaluate the changing patterns of in vitro IgE sensitization tests in allergic rhinitis patients across all age groups. METHODS: We recruited all patients who were diagnosed as having rhinitis and who underwent in vitro IgE sensitization testing from 2007 to 2016...
May 18, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28515735/time-course-transcriptome-analysis-of-compatible-and-incompatible-pollen-stigma-interactions-in-brassica-napus-l
#11
Tong Zhang, Changbin Gao, Yao Yue, Zhiquan Liu, Chaozhi Ma, Guilong Zhou, Yong Yang, Zhiqiang Duan, Bing Li, Jing Wen, Bin Yi, Jinxiong Shen, Jinxing Tu, Tingdong Fu
Brassica species exhibit both compatible and incompatible pollen-stigma interactions, however, the underlying molecular mechanisms remain largely unknown. Here, RNA-seq technology was applied in a comprehensive time-course experiment (2, 5, 10, 20, and 30 min) to explore gene expression during compatible/incompatible pollen-stigma interactions in stigma. Moderate changes of gene expression were observed both in compatible pollination (PC) and incompatible pollination (PI) within 10 min, whereas drastic changes showed up by 30 min, especially in PI...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28515146/transcriptome-of-wheat-inflorescence-development-from-spikelet-initiation-to-floral-patterning
#12
Nan Feng, Gaoyuan Song, Jiantao Guan, Kai Chen, Meiling Jia, Dehua Huang, Jiajie Wu, Lichao Zhang, Xiuying Kong, Shuaifeng Geng, Jun Liu, Aili Li, Long Mao
Early reproductive development in cereals is crucial for final grain number per spike, and hence the yield potential of the crop. To date, however, no systematic analyses of gene expression profiles during this important process have been conducted for common wheat (Triticum aestivum). Here, we studied the transcriptome profiles at four stages of early wheat reproductive development, from spikelet initiation to floral organ differentiation. K-means clustering and stage-specific transcript identification detected dynamically expressed homoeologs of important transcription regulators in spikelet and floral meristems that may be involved in spikelet initiation, floret meristem specification, and floral organ patterning, as inferred from their homologs in model plants...
May 17, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28512086/two-loci-contribute-epistastically-to-heterospecific-pollen-rejection-a-postmating-isolating-barrier-between-species
#13
Jennafer A P Hamlin, Natasha A Sherman, Leonie C Moyle
Recognition and rejection of heterospecific male gametes occurs in a broad range of taxa, although the complexity of mechanisms underlying these components of postmating cryptic female choice is poorly understood. In plants, the arena for postmating interactions is the female reproductive tract (pistil), within which heterospecific pollen tube growth can be arrested via active molecular recognition and rejection. Unilateral incompatibility (UI) is one such postmating barrier in which pollen arrest occurs in only one direction of an interspecific cross...
May 16, 2017: G3: Genes—Genomes—Genetics
https://www.readbyqxmd.com/read/28510185/morphological-physiological-cytological-and-phytochemical-studies-in-diploid-and-colchicine-induced-tetraploid-plants-of-fagopyrum-tataricum-l-gaertn
#14
Lin-Jiao Wang, Mao-Yin Sheng, Pei-Cai Wen, Jia-Ying Du
BACKGROUND: Tartary buckwheat are very popular as an important functional food material and its cultivation is very widespread in our whole world, but there obviously lack works in the researches of genetic breeding for agricultural and medicinal utilization. The aim of this study is to obtain good germplasm resources for agricultural and medicinal use of tartary buckwheat (Fagopyrum tataricum) by inducing the tetraploid plants. RESULTS: Four cultivars of F. tataricum, that is, Qianwei 2#, Jinku 2#, Chuanqiao 1#, and Liuqiao 1# were selected to experiment...
December 2017: Botanical Studies (Taipei, Taiwan)
https://www.readbyqxmd.com/read/28509898/modern-pollen-data-from-the-canadian-arctic-1972-1973
#15
Harvey Nichols, Susann Stolze
This data descriptor reports results of a 1972-73 baseline study of modern pollen deposition in the Canadian Arctic to originally aid interpretation of Holocene pollen diagrams from that region, especially focussed on the arctic tree-line. The data set is geographically unique due to its extent, and allows the assessment of the effects of modern climate change on northern ecosystems, including fluctuations of the a arctic tree-line. Repeated sampling was conducted along an interior transect at 29 sites from the Boreal Forest to the High Arctic, with five additional coastal sites covering a total distance of 3,200 km...
May 16, 2017: Scientific Data
https://www.readbyqxmd.com/read/28508929/untargeted-metabolomic-analysis-of-tomato-pollen-development-and-heat-stress-response
#16
Marine J Paupière, Florian Müller, Hanjing Li, Ivo Rieu, Yury M Tikunov, Richard G F Visser, Arnaud G Bovy
Pollen development metabolomics. Developing pollen is among the plant structures most sensitive to high temperatures, and a decrease in pollen viability is often associated with an alteration of metabolite content. Most of the metabolic studies of pollen have focused on a specific group of compounds, which limits the identification of physiologically important metabolites. To get a better insight into pollen development and the pollen heat stress response, we used a liquid chromatography-mass spectrometry platform to detect secondary metabolites in pollen of tomato (Solanum lycopersicum L...
May 16, 2017: Plant Reproduction
https://www.readbyqxmd.com/read/28508789/propose-of-standards-based-it-architecture-to-enrich-the-value-of-allergy-data-by-telemonitoring-data
#17
Philipp Urbauer, Maximilian Kmenta, Matthias Frohner, Alexander Mense, Stefan Sauermann
Interoperability is a key requirement for any IT-System to be future proof and cost efficient, due to the increasing interaction of IT-Systems in Healthcare. This feasibility study is part of a larger project focusing on the conceptualization and evaluation of interoperable and modular IT-Framework components for exchanging big data information sets. Hence, this project investigates the applicability of a standard based IT-Architecture for the integration of Personal Health Devices data and open data sources...
2017: Studies in Health Technology and Informatics
https://www.readbyqxmd.com/read/28507558/zmdof30-negatively-regulates-the-promoter-activity-of-the-pollen-specific-gene-zm908
#18
Jing Peng, Xin Qi, Xiyang Chen, Nan Li, Jingjuan Yu
The maize (Zea mays) pollen-predominant gene Zm908, a novel small-peptide gene, was reported to play critical roles in pollen germination and pollen tube growth in our previous work. In this study, we aimed to explore the regulatory mechanism of Zm908. The putative promoter of Zm908 was cloned and analyzed. The activity analysis of a series of promoter truncations in different tissues of transgenic tobacco plants indicated that the Zm908 promoter is pollen-specific and that the -126 to -68 region is crucial for pollen expression...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28506423/a-case-of-recurrent-facial-angioedema-associated-with-elevated-tree-pollen-counts
#19
Divya Jayaraman, Donna L Bratton, Ronald J Harbeck, Molly Wolf, Nathan Rabinovitch
No abstract text is available yet for this article.
May 11, 2017: Journal of Allergy and Clinical Immunology in Practice
https://www.readbyqxmd.com/read/28505483/the-effects-of-ingested-aqueous-aluminum-on-floral-fidelity-and-foraging-strategy-in-honey-bees-apis-mellifera
#20
Ana M Chicas-Mosier, Bree A Cooper, Alexander M Melendez, Melina Pérez, Devrim Oskay, Charles I Abramson
Pollinator decline is of international concern because of the economic services these organisms provide. Commonly cited sources of decline are toxicants, habitat fragmentation, and parasites. Toxicant exposure can occur through uptake and distribution from plant tissues and resources such as pollen and nectar. Metals such as aluminum can be distributed to pollinators and other herbivores through this route especially in acidified or mined areas. A free-flying artificial flower patch apparatus was used to understand how two concentrations of aluminum (2mg/L and 20mg/L) may affect the learning, orientation, and foraging behaviors of honey bees (Apis mellifera) in Turkey...
May 12, 2017: Ecotoxicology and Environmental Safety
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