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Sunday - Mars 13 |
Abstracts |
The
Evolution of the Orchid Hobbyist Through the Centuries
*Norito Hasegawa. Undoubtedly
orchids have been admired for centuries. It is inconceivable that native
people of many countries have not admired orchids as they grew and flowered
in their habitat. However, whether they were collected and successfully
grown as pet plants over the millennia has not necessarily been recorded. During
the last years several Bulbophyllum species came to the collections
of orchid growers and amateurs. Some of them are old friends but some
are really new, they have fantasy names just to identify them. The
difficulty for scientists is, without any origin their is no chance
to describe them. The plants came from collectors and breeders in
Vietnam and the countries around. Some of them are very exciting,
they produce lovely colours and unusual flowerforms. For the reason
that Bulbophyllum has somewhat as a renaissance some showy hybrids
will also be shown. Examples for these new members of genus Bulbophyllum
are Bulbophyllum lepidum rot, Bulbophyllum pectenveneris, Bulbophyllum
retusiusculum and Bulbophyllum frostii. Comparative
analysis between Orchis species and their hybrid Hybridization
is commonly regarded as one of the leading mechanisms in plant evolution.
Its widespread occurrence within Orchidaceae suggests that it may
play a significant role in orchid speciation and in their evolution.
Ecological observations and studies of odours emitted by plants can
yield information on the causes and consequences of hybridization.
We studied the parental species Orchis simia and O. anthropophora
and their hybrid O. bergonii in the region of “Grands Causses”
north of Montpellier, France. We compared floral morphology, the suite
of flower visitors and (using head-space technique) the volatile compounds
emitted by flowers of the three taxa. Hybrids were intermediate in
floral morphology between their two parents. We distinguished among
confirmed pollinators, potential pollinators and non-pollinating among
insects observed on the inflorescences. One species of beetle was
a confirmed pollinator of the two parental species. Interestingly,
the habitat in which the hybrid occurs is also that in which this
beetle occurs. The volatile compounds emitted by O. bergonii were
quantitatively very different from those emitted by O. simia and O.
anthropophora. This difference can explain why only few insects were
observed on the inflorescences of hybrids, whereas insects were more
numerous on inflorescences of the two parental species. This case
then constitutes a promising model for understanding the ecology of
pollination in hybrid orchids. Bertrand Schatz is a young researcher in the French CNRS, where he investigates several insects-orchids interactions in the Mediterranean region. He is in charge of the scientific commission “Insects-orchids interactions” of SFO (French Society of Orchidophily). |
Stands |
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Plants |
![]() Polystachya galeandra |
![]() Bulbophyllum sulawesi |
![]() Paphiopedilum Wössner Leguant |
![]() Odontioda Picasso 'Rubia' |
![]() Chysis bractensis |
![]() Cyrtochilum macrantum |
![]() Epidendrum corifolium |
![]() Drts Nobby`s Purple (Splash) |