7 research outputs found

    Arnica montana : évaluation des ressources génétiques françaises en vue du développement de la culture en plaine et en montagne

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    Ce volume regroupe les textes issus du programme Casdar "Innovation et Partenariat" et "Recherche finalisée et innovation" de 2013. Le colloque de restitution s’est déroulé le 6 février 2019 sous l’égide du GIS Relance AgronomiqueArnica montana is a major medicinal specie, which is now mainly produced from wild harvesting,especially in mainland France. As the wild resource is decreasing, and in order to maintain or even Gourlin L. et al. 68 Innovations Agronomiques 71 (2019), 67-80 develop the French production, cultivation is a good option, that is still very limited, because of its difficulty. Finding the right plant material could help to enhance cultivation programs. This project aimed at growing 24 wild populations, which were collected in mainland France, and to compare them with 2 commercial varieties, ‘Arbo’ and ‘Arnimed’. This was set on 4 experimentation spots, chosen for their potential match for Arnica cultivation. The experiment lasted 3 years, and morphological andagronomical subjects were studied on the populations. Sesquiterpene lactones and flavonoidsanalyzed, and a new methodology of evaluation was developed. The results showed extreme variabilityof phenotypic and chemical expression of the different populations. An important death rate has beennoticed on wild populations, but the causes are still unknown. On the set of variables chosen,commercial varieties ‘Arbo’ and ‘Arnimed’ were particularly competitive, and two wild populations standout with promising results. One seems appropriate for starting selection works on a variety that would besuitable for loaw altitude, and the other one could be a local (French) alternative to the cultivation ofselected varieties (‘Arbo’ and ‘Arnimed’ are from Swiss and German selection work).L’arnica des montagnes est une espèce médicinale importante dont la production est principalementissue de la cueillette à l’état sauvage, notamment sur le territoire métropolitain. La ressource étant enrégression, le maintien, voire le développement de la production française passe donc par la mise enculture, actuellement anecdotique car difficile. Certains freins pourraient être levés par la mise enévidence de matériel végétal adapté à la production. L’objectif de ce projet était de mettre en culture 24populations d’origines sauvages (prospectées en France métropolitaine) et de les comparer à deuxvariétés commerciales témoins ‘Arbo’ et ‘Arnimed’, sur 4 sites d’expérimentation aux contextespédoclimatiques variés mais a priori adaptés à la culture de l’espèce. Durant les 3 années d’essai, unsuivi morphologique et agronomique des populations a été réalisé. Des analyses des sesquiterpèneslactones et flavonoïdes ont été effectuées, et une nouvelle méthodologie de dosage de ces composés aété développée. Les résultats mettent en exergue la forte variabilité de l’expression phénotypique etchimique des différentes souches testées. Une forte mortalité globale a pu être constatée surl’ensemble des populations sauvages étudiées sans que les causes aient pu en être identifiées. Surl’ensemble des variables suivies, les variétés commerciales ‘Arbo’ et ‘Arnimed’ sont particulièrementperformantes, et deux populations sauvages se démarquent par leurs résultats intéressants : l’uneparait pertinente pour démarrer des travaux de sélection d’une variété adaptée à la basse altitude,tandis que l’autre, originaire du Massif central, pourrait se proposer comme une alternative d’originelocale (française) à la culture de variétés commerciales sélectionnées (suisse et allemande)

    Oral health in a First Nations and a non-Aboriginal population in Manitoba

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    Objectives: To analyze the prevalence of poor oral health and selected determinants in First Nations (FN) and Caucasian samples in Manitoba, Canada. Study design: Cross-sectional survey, nested in a cohort study. Methods: FN and Caucasian participants completed a questionnaire on socio-demographic variables, oral health symptoms, and oral health-related behaviours as part of a broader cohort study comparing these ethnic groups for different chronic immune mediated diseases. Results: Caucasians reported higher levels of employment, education, and urban dwelling than FNs (p<0.001). FNs reported smoking more, and having poorer oral health-related behaviours than Caucasians (p<0.001). After adjustment for age and sex, FN reported having more oral health symptoms than Caucasians (odds ratio (OR): 2.71; 95% confidence interval (CI): 1.73, 4.52), but the association was reduced and not statistically significant after adjustment for other socio-demographic variables (OR=1.34; 95% CI: 0.58, 3.10). Oral health symptoms were associated with current smoking among FN (adjusted OR=2.67, 95% CI: 1.05, 6.78). Oral hygiene behaviours were significantly related to smoking status, rural living and education for both groups. Conclusions: Oral health-related behaviours and smoking were found to be significant factors explaining poor oral health, which were lower for the FNs cohort than the Caucasian sample. However oral health and related behaviours were less related to their ethnicity than to socio-demographic factors, suggesting that policies to change behaviour will not result in lasting reductions in oral health differences between these groups in Manitoba
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