نتایج جستجو برای: orchid

تعداد نتایج: 2578  

Journal: :Molecular ecology 2002
Marc-André Selosse Michael WEIss Jean-Luc Jany Annie Tillier

Several achlorophyllous orchids associate with ectomycorrhizal hymenomycetes deriving carbon from surrounding trees for the plant. However, this has not been shown for achlorophyllous orchids associating with species of Rhizoctonia, a complex of basal lineages of hymenomycetes that are the most common orchid partners. We analysed Neottia nidus-avis, an achlorophyllous orchid symbiotic with a Rh...

2012
Hans Jacquemyn Agnieszka Deja Koen De hert Bruno Cachapa Bailarote Bart Lievens

BACKGROUND Orchid species rely on mycorrhizal symbioses with fungi to complete their life cycle. Although there is mounting evidence that orchids can associate with several fungi from different clades or families, less is known about the actual geographic distribution of these fungi and how they are distributed across different orchid species within a genus. METHODOLOGY/PRINCIPAL FINDINGS We ...

Journal: :Annals of botany 2013
Jonathan R De Long Nigel D Swarts Kingsley W Dixon Louise M Egerton-Warburton

BACKGROUND AND AIMS Mycorrhizal specialization has been shown to limit recruitment capacity in orchids, but an increasing number of orchids are being documented as invasive or weed-like. The reasons for this proliferation were examined by investigating mycorrhizal fungi and edaphic correlates of Microtis media, an Australian terrestrial orchid that is an aggressive ecosystem and horticultural w...

Journal: :The American journal of tropical medicine and hygiene 2013
Meron Haile Zerihun Tadesse Sintayehu Gebreselassie Berhan Ayele Teshome Gebre Sun N Yu Nicole E Stoller Bruce D Gaynor Travis C Porco Paul M Emerson Thomas M Lietman Jeremy D Keenan

Latrine use has been promoted as a component of an integrated strategy for trachoma control. As part of a randomized trial in Ethiopia, 12 communities received a mass azithromycin distribution followed by a latrine promotion intervention. A random sample of children ages 0-9 years in each community was monitored longitudinally for ocular chlamydia. After latrine construction ended, those commun...

Journal: :Brazilian journal of biology = Revista brasleira de biologia 2013
A Nemésio

The orchid-bee faunas of 'Parque Nacional do Monte Pascoal', 'Parque Nacional do Descobrimento' and three other Atlantic Forest remnants ranging from 1 to 300 ha in southern Bahia, eastern Brazil, were surveyed. Baits with seventeen different scents were used to attract orchid-bee males. Four thousand seven hundred and sixty-four males belonging to 36 species were actively collected with insect...

Journal: :The American naturalist 2011
Richard J Waterman Martin I Bidartondo Jaco Stofberg Julie K Combs Gerhard Gebauer Vincent Savolainen Timothy G Barraclough Anton Pauw

Both pollination by animals and mycorrhizal symbioses with fungi are believed to have been important for the diversification of flowering plants. However, the mechanisms by which these above- and belowground mutualisms affect plant speciation and coexistence remain obscure. We provide evidence that shifts in pollination traits are important for both speciation and coexistence in a diverse group...

2001

Until 1804, when Salisbury found that orchid seeds could germinate, the seeds were considered sterile. Much later, in 1889, Bernard's discovery of the special conditions necessary for their growth and development explained the lack of success in previous attempts to obtain plantules, and the success, although mediocre, when sowing of seed took place at the foot of the mother plant. Knowing the ...

2015
Choun-Sea Lin Jeremy J. W. Chen Yao-Ting Huang Ming-Tsair Chan Henry Daniell Wan-Jung Chang Chen-Tran Hsu De-Chih Liao Fu-Huei Wu Sheng-Yi Lin Chen-Fu Liao Michael K. Deyholos Gane Ka-Shu Wong Victor A. Albert Ming-Lun Chou Chun-Yi Chen Ming-Che Shih

The NAD(P)H dehydrogenase complex is encoded by 11 ndh genes in plant chloroplast (cp) genomes. However, ndh genes are truncated or deleted in some autotrophic Epidendroideae orchid cp genomes. To determine the evolutionary timing of the gene deletions and the genomic locations of the various ndh genes in orchids, the cp genomes of Vanilla planifolia, Paphiopedilum armeniacum, Paphiopedilum niv...

Journal: :The American naturalist 2007
Brendan J Borrell

Morphology influences the rate at which foraging bees visit nectar flowers, the quantity of nectar they must consume to fuel their activities, and, consequently, the profitability of flower species. Because feeding time is a major determinant of visitation rate, I used a biomechanical model to examine how energy intake rate (E) varies with sucrose concentration, body mass (M), and proboscis len...

2017
Oscar Alejandro Pérez‐Escobar Guillaume Chomicki Fabien L. Condamine Adam P. Karremans Diego Bogarín Nicholas J. Matzke Daniele Silvestro Alexandre Antonelli

The Andean mountains of South America are the most species-rich biodiversity hotspot worldwide with c. 15% of the world's plant species, in only 1% of the world's land surface. Orchids are a key element of the Andean flora, and one of the most prominent components of the Neotropical epiphyte diversity, yet very little is known about their origin and diversification. We address this knowledge ga...

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