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At least 127 records · Page 7Linked to original sources
PubMed2006

Application of plant DNA markers in forensic botany: genetic comparison of Quercus evidence leaves to crime scene trees using microsatellites.

As highly polymorphic DNA markers become increasingly available for a wide range of plant and animal species, there will be increasing opportunities for applications to forensic investigations. To date, however, relatively few studies have reported using DNA profiles of non-human species to place suspects at or near crime scenes. Here we describe an investigation of a double homicide of a female and her near-term fetus. Leaf material taken from a suspect's vehicle was identified to be that of sand live oak, Quercus geminata, the same tree species that occurred near a shallow grave where the victims were found. Quercus-specific DNA microsatellites were used to genotype both dried and fresh material from trees located near the burial site and from the material taken from the suspect's car. Samples from the local population of Q. geminata were also collected and genotyped in order to demonstrate that genetic variation at four microsatellite loci was sufficient to assign leaves to an individual tree with high statistical certainty. The cumulative average probability of identity for these four loci was 2.06x10(-6). DNA was successfully obtained from the dried leaf material although PCR amplification was more difficult than amplification of DNA from fresh leaves. The DNA profiles of the dried leaves from the suspect's car did not match those of the trees near the crime scene. Although this investigation did not provide evidence that could be used against the suspect, it does demonstrate the potential for plant microsatellite markers providing physical evidence that links plant materials to live plants at or near crime scenes.

DNA, Plant↗
PubMed1970

Three hundred years of botany in Edinburgh.

This week the tercentenary of the Royal Botanic Garden, Edinburgh, is being celebrated with, among other things, the opening of an exhibition hall given by an anonymous donor. This article traces the fortunes of the Garden during the past three hundred years.

Journal Article↗
PubMed2004

Botany: a new self-pollination mechanism.

Pollen grains from most flowering plants are transported by wind or animals and deposited on the receptive surface of the stigma of a different individual, but self-pollination is also common. We have discovered a new process for self-pollination in the laterally orientated flowers of a Chinese herb, in which a film of pollen is transported from the anther (pollen sacs) by an oily emulsion that slides sideways along the flower's style and into the individual's own stigma. This mode of self-pollination is a new addition to the broad range of genetic and morphological mechanisms that have evolved in flowering plants (angiosperms), and may be common in species growing in shady, windless and insect-poor habitats.

Animals↗
PubMed2005

Botany: specialized bird perch aids cross-pollination.

Birds may hover over or perch on flowers when feeding on nectar, and this assists cross-pollination if they then visit other plants. Here we investigate the curious sterile inflorescence axis of the South African Cape endemic 'rat's tail' plant (Babiana ringens, Iridaceae), whose function--unlike in other bird-pollinated plants--is exclusively to provide a perch for foraging birds. We find that this structure promotes the plant's mating success by causing the malachite sunbird (Nectarinia famosa), its main pollinator, to adopt a position ideal for the cross-pollination of its unusual ground-level flowers.

Animals↗
PubMed2005

Botany: a record-breaking pollen catapult.

The release of stored elastic energy often drives rapid movements in animal systems, and plant components employing this mechanism should be able to move with similar speed. Here we describe how the flower stamens of the bunchberry dogwood (Cornus canadensis) rely on this principle to catapult pollen into the air as the flower opens explosively. Our high-speed video observations show that the flower opens in less than 0.5 ms--to our knowledge, the fastest movement so far recorded in a plant.

Cornus↗
PubMed2005

Botany: floral fluorescence effect.

The way flowers appear to insects is crucial for pollination. Here we describe an internal light-filtering effect in the flowers of Mirabilis jalapa, in which the visible fluorescence emitted by one pigment, a yellow betaxanthin, is absorbed by another, a violet betacyanin, to create a contrasting fluorescent pattern on the flower's petals. This finding opens up new possibilities for pollinator perception as fluorescence has not previously been considered as a potential signal in flowers.

Animals↗
PubMed2001

Zoology meets Botany: establishing intracellular organelles by endosymbiosis.

One of the most citated characteristics of eukaryotic cells are mitochondria and in the case of phototrophic cells, the plastids. These organelles are of eubacterial origin and contain a remnant genome. Here, we present hypotheses concerning the origin of the first mitochondrium-harboring cell and show the evolution of primary, secondary and tertiary plastids. Furthermore we discuss models explaining why plastids have to maintain their own genome.

Journal Article↗
PubMed2002

A darker shade of green: medical botany, homeopathy, and cultural politics in interwar Germany.

In 1941 a proposal was made to Nazi SS Reichsführer, Heinrich Himmler, that extracts of a South American plant, Dieffenbachia seguine, might be used for the mass sterilization of racially undesirable war prisoners. The proposal was based on published animal fertility research conducted by Dr Gerhard Madaus, co-founder of a firm that produced and marketed natural medicinals. His fertility experiments were part of a broader series aimed at evaluating the scientific validity of ethnobotanical folk-knowledge. This article traces the historical background to the Madaus research: first, the role of homeopathy in the introduction of Dieffenbachias to western medicine; secondly, the social context of German 'alternative' medicine in the interwar period; and finally, the role of Madaus himself, whose homeopathically-oriented research on botanical medicinals inadvertently initiated the chain of events described here.

Abortion, Eugenic↗