454 research outputs found
Mud-mounds : do they still constitute an enigma ?
No full textBourque P.A. Mud-mounds : do they still constitute an enigma ?. In: Géologie Méditerranéenne. Tome 28, numéro 1-2, 2001. Anatomy of Carbonate Bodies / Anatomie des corps carbonates. International Meeting / Colloque international. Marseille, 9-12 mai 2001, France, sous la direction de Marc Floquet, Jérôme Hennuy et Jean-Pierre Masse. pp. 27-32
Bourque PLOS one
No full textNerve conduction studies of median and ulnar nerves at time of cast removal and 6 weeks subsequentlyPublication submitted to PLOS one</div
Lobe-generating centres in the simple leaves of Myriophyllum aquaticum: evidence for KN1-like activity
No full textBackground and Aims
The mature morphology of most plants can usually be said to consist of three mutually exclusive organs: leaves, stems, and roots. The vast majority of mature morphologies may be easily grouped into one of these mutually exclusive categories. However, during very early stages of development and in many instances from inception, the division between organ categories becomes fuzzy due to the overlap in developmental processes that are shared between the aforementioned mutually exclusive categories. One such overlap has been described at the gene level where KNOXI homologues, transcription factors responsible for maintaining indeterminate cell fate, are expressed in the shoot apical meristem and during early stages of compound leaf development. This study characterizes the occurrence and spatial localization of mRNA of a KNOXI homologue, MaKN1, during the early stages of development in the simple leaves of Myriophyllum aquaticum, an aquatic angiosperm from the family Haloragaceae exhibiting pentamerous whorls of finely lobed leaves.
Methods
A 300-bp KNOXI fragment was sequenced from M. aquaticum and used in an RNA localization study to determine the temporal and spatial expression of KNOXI during the early stages of leaf lobe development in M. aquaticum. The developmental sequence of leaves of M. aquaticum was also described using scanning electron microscopy.
Key Results
Lobe development of M. aquaticum occurs in two very distinct regions at the leaf base in an alternating fashion reminiscent of a distichous shoot system. It was discovered that MaKN1 expression is localized to both the shoot apical meristem and early stages of leaf primordia development (P1–P7). Initially, MaKN1 is expressed ubiquitously throughout primordia (P1–P3); however, as lobes develop, MaKN1 becomes localized to recently emerged lobe primordia, and disappears as lobes develop basipetally.
Conclusions
The pattern of gene expression is indicative of shared developmental processes during early development between shoots, compound leaves, highly lobed simple leaves and unifoliate simple leaves which lack KNOXI expression. These findings are supportive of Arber's less rigid ‘partial shoot’ theory, which conceptualizes compound leaves as having shoot-like elements
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Concepteur du Jardin d'Israël : Meyer Chaouat.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005.Au sol, au premier plan: Dallage de pierre datant de l'époque d'Hérode
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Concepteur du Jardin du Québec : Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Concepteur du Jardin du Québec : Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005.Au centre: Maison québécoise construite en pièce sur pièce
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005
Jardins des Floralies, parc Jean-Drapeau, Montréal, 1980
No full textCoordonnateurs de l'aménagement: Pierre Bourque, Raymond Thibaudeau.; Architectes: André Bouchard, André Blain, Paul Melanson.; Architectes-paysagistes: Gaétan Bilodeau, Alain Baillargeon, Carlos Martinez, Jean Landry.; Concepteur du Jardin du Québec : Jean Landry.; Date d'aménagement: 1980.; Jardins hérités des Floralies internationales de Montréal tenues du 17 mai au 1er septembre 1980.; Photographie: Carlos Pineda, 2005.Au centre: Allée menant à l'entrée du jardin
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