Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"orchids"”.
-
Assessment of the microbiome associated with endangered orchids
… While certain mycorrhizal fungi are required for orchids to germinate, these mycorrhizae form just part of a microbial community that interacts with the plant. In this study, we sought a broader picture of the microbiome associated with these plants. A major motivation for our work is the concern …
-
PRODUCTION OF VIRUS-FREE ORCHIDS VIA TISSUE CULTURE TECHNIQUES
Due to constant handling and vegetative propagation, most commercially cultivated orchid hybrids are systemically infected with cymbidium mosaic virus (CyMV) and/or odontoglossum ringspot virus (ORSV). Two tissue culture techniques were employed in this project to eliminate the viral pathogens from …
-
Diversity of mycorrhizal fungi and carbon nutrition in tropical epiphytic orchids
Orchids, in the nature, depend on the interaction with mycorrhizal fungi to complete the life cycle. At the center of the interaction, different fungi are involved which promote the exchange of compounds, mainly carbon, with the host orchid. However, the diversity of mycorrhizal fungi, mainly those …
-
Evaluating the Evolutionary and Genetic Relationships of the Andean Orchids of Northwestern Ecuador
<p>DNA barcoding is a molecular based technique used to separate and identify individual species. Here we establish a DNA Barcode library for the orchid flora of an Andean cloud forest in Northwestern Ecuador. The library contains 135 <em>matK</em> and 136 <em>rbcL</em> DNA Barcodes representing …
-
Synthetic and ecological chemistry of natural products and analogues from sexually deceptive Chiloglottis orchids
… speciation of sexually deceptive Chiloglottis orchids. Pollination by deception is a well documented phenomenon, particularly in the Orchidaceae, however only in recent decades has the chemical mimicry that so often drives these pollination syndromes become the subject of enquiry. This report …
-
Synthetic and ecological chemistry of natural products and analogues from sexually deceptive Chiloglottis orchids
… speciation of sexually deceptive Chiloglottis orchids. Pollination by deception is a well documented phenomenon, particularly in the Orchidaceae, however only in recent decades has the chemical mimicry that so often drives these pollination syndromes become the subject of enquiry. This report …
-
Orchid Care: an exploration in experiential and theoretical environmental care practice shown to orchids through the Anthropocene
… theoretical environmental care practice shown to orchids through the Anthropocene. It revolves around two African orchid species, one in Cape Town and one in Zimbabwe, and the care practices shown to these plants. The thesis explores the question: in what way does an orchid's status generate a …
-
Phenological responses of British orchids and their pollinators to climate change: an assessment using herbarium and museum collections
… responses to temperature of flowering in British orchids and flight in their pollinators. Herbarium specimens of O. sphegodes collected in the UK between 1848 and 1958 were compared to direct observation of peak flowering time in one population located in Southern England between 1975 and 2006. …
-
Investigating the ecology of partial and full myco-heterotrophy among Orchidaceae and Ericaceae using the stable isotope natural abundance analysis approach
… family among myco-heterotrophic plants. All orchids are myco-heterotrophic during their juvenile belowground phases but most species develop green leaves as adults. A similar situation occurs in the tribe Pyroleae (Ericaceae), consisting of mostly photosynthetic species that, as like as …
-
EFFECTS OF FOREST SUCCESSION ON RAM'S HEAD LADY'S SLIPPER (CYPRIPEDIUM ARIETINUM) POPULATIONS IN THE GRAND SABLE DUNES, MI
… since Bozic (2015) first surveyed GSD. I counted orchids, flowers, and fruit set in 741 1-m radius plots using stratified random sampling across 44 islands. I also resurveyed three 4 x 4-m permanent plots established by Bozic. The estimated C . ari e t i n u mpopulation declined by 65% in the …
-
Pengaruh pupuk majemuk NPK 32-10-10 dalam media agar pada subkultur anggrek bulan raksasa (Phalaenopsis gigantea)
… gigantea is endemic on the island of Borneo orchids, so it is classified as rare and endangered orchids. Cultivation of orchid seeds do not like the seeds of plants in general, the seeds can be grown in vivo, orchid seeds are not equipped with the endosperm, therefore subculture cultivated …
-
HABITAT CHARACTERISTICS AND DEMOGRAPHY OF CALYPSO BULBOSA AND CYPRIPEDIUM ARIETINUM IN THE GRAND SABLE DUNES, MICHIGAN
… it is strongly associated with several other orchids, and occurs primarily in moist swales. Climate change may have a tremendous impact on the Grand Sable Dunes and its plant communities. The long-term effects of climate change on these orchids and their associated mycorrhizae are unknown.</p>
-
The structure of the perennial growth of Disa uniflora Berg. (Orchidaceae)
The perennation of orchids is poorly understood, in particular that of the Orchidoidae. The understanding of perennation in the Orchidoidae is important because the root-stem tuberoid is used as the one character defining the Orchidoidae as a monophyletic group. The root-stem tuberoid has never …
-
Cytogenetic Studies in the Genus Cymbidium
<p>The orchids known today make up one of the largest Angiospermous families in the world. Recent estimates place the number of genera at about 450 which estimates between 10,000 and 15,000 species (some authorities go as high as 20,000). They are without doubt one of the most highly specialized …
-
Discerning Patterns of Floral Sugar-Feeding: Dynamics of the Mosquito Culex antillummagnorum in Puerto Rico
… because it belongs to the same subtribe of orchids as <em>Platanthera</em> and <em>Pterostylus</em>, genera fed upon and pollinated by mosquitoes. Among <em>Habenaria</em> species in Puerto Rico <em>H. amalfitana</em> emerged as the strongest candidate due to its relatively short nectar …
-
Characterization of two genes, trehalose-6-phosphate synthase/phosphatase and nucleotide binding protein, shown to be differentially regulated in roots of Cypripedium parviflorum var. pubescens grown with a mycorrhizal fungus Thanatephorus pennatus
… Fungi associated with North American terrestrial orchids were once included in the pathogenic genus Rhizoctonia. This suggests that orchids are able to overcome or utilize normally pathogenic pathways to establish symbioses. A differential display technique was employed to analyze gene changes in …
-
Isolating and Identifying Fungal Endophytes from Roots of Rare Orchid Cypripedium arietinum in Grand Sable Dunes, Michigan
… year’s roots from 75 <em>C. arietinum</em> orchids at 75 locations within 4 jack pine forests in the Grand Sable Dunes, Pictured Rocks National Lakeshore, Michigan. Fungal endophyte cultures were obtained from roots and subcultured for DNA extraction. DNA was PCR amplified with primers that …
-
Expression and Function of the Chloroplast-encoded Gene matK
… that an out-of-frame matK start codon in some orchids compensates for these otherwise deleterious indels. This research represents the first in-depth analysis of matK gene expression and contributes to several fields of biology including plant systematics, genetics and gene expression.
-
Effects of Vernalization Duration, Light Intensity during Vernalization and Low Temperature Holding after Vernalization on Flowering of Nobile Dendrobium Hybrids
… strategy to defer flowering of nobile dendrobium orchids by holding them under low temperature. Mature Den. Red Emperor 'Prince' and Den. Sea Mary 'Snow King' were held at 10 degrees C for various durations (0, 4, 8, 12 or 16 weeks) after vernalization (4 weeks at 10 degrees C). Plants were forced …
Page 1 of 2