A study of the ecotypical variability for three plant taxa that are colonising the disturbed milieux of the supra-forest mountain areas in the Maurienne and upper Tarentais regions

• Main Authors: Bédécarrats, A., LUMARET, Roselyne, Gauthier, P.
• Other Authors: Ecosystèmes et paysages montagnards (UR EPGR), Centre national du machinisme agricole, du génie rural, des eaux et forêts (CEMAGREF), irstea
• Format: Report
• Language: French
• Published: HAL CCSD 1997
• Subjects: [SDE]Environmental Sciences; Poa alpina
• Online Access: https://hal.inrae.fr/hal-02578356

In order to determine the criteria for the constitution of a grass plant material adapted to the repopulation of disturbed sites in mountain areas, the infraspecific genetic variation of an adaptive nature determined by the conditions of the supra-forest mountain milieux was studied in Savoy in three taxa. These were two Graminaceae, Dactylis glomerata L and Poa alpina L and one leguminous plant, the "complex" (Lotus corniculatus L./ Lotus alpinus DC. Schleicher). Genetic investigations (isozymic analyses and RFLP of chloroplastic ADN) and experiments to observe the plasticity and phenology of flowering, the morphology, growth and the reproductive capacity to genotypes that are representative of the population at the sub-alpine level were carried out. Suitable behaviour for the reproduction were shown. The existence of an "alpine" complex is shown. These results lead to the favouring of the development of a plant material of very high altitude for Poa alpina based on populations at the alpine level, of a plant material for dry calcicole milieux of sub-alpine regions based on individual "reichenbachii" for Dactyla and for sweet clover, of a "native" plant material based on alpine populations. Afin de déterminer les critères de constitution d'un matériel végétal herbacé adapté pour le repeuplement des sites perturbés en montagne, la variation génétique infraspécifique de nature adaptative déterminée par les conditions de milieux supraforestier d'altitude a été étudiée en Savoie chez trois taxons. Il s'agit de deux graminées : Dactylis glomerata L. et Poa alpina L., et d'une légumineuse : le "complexe" (Lotus corniculatus L. / Lotus alpinus DC Schleicher). Des investigations génétiques (analyses isozymiques et RFLP de l'ADN chloroplastique), et des expérimentations visant à observer la plasticité de la phénologie de la floraison, la morphologie, la croissance et la capacité reproductive de génotypes représentatifs de populations de l'étage subalpin ont été menées. Un comportement adaptatif pour la reproduction a ...