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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Propagação in vitro da baunilheira (Orchidaceae)

Nunes, José Arcanjo 17 December 2013 (has links)
Made available in DSpace on 2016-08-29T15:36:33Z (GMT). No. of bitstreams: 1 tese_6615_Jose Arcanjo Nunes.pdf: 808121 bytes, checksum: 5388986520723a2d9254b75dde7fd51a (MD5) Previous issue date: 2013-12-17 / Foram realizados dois experimentos com os objetivos de avaliar os efeitos de diferentes concentrações de sacarose no crescimento in vitro de mudas de Vanilla planifolia, e analisar as variáveis morfológicas de mudas de V. planifolia cultivadas em diferentes recipientes e diferentes substratos. Para isso, no experimento 1, mudas provenientes da proliferação de gemas axilares foram cultivadas in vitro em cinco concentrações de sacarose (0, 15, 30, 45 e 60 g L-1), com quatro repetições de dez mudas, em delineamento inteiramente casualizado. Variáveis morfológicas, fluorescência da clorofila a, teor de amido, taxa de perda de água e o pH do meio de cultura foram avaliados 60 dias após a inoculação das mudas. As diferentes concentrações de sacarose influenciaram todas as características morfológicas e os parâmetros fisiológicos estudados. Os dados relativos aos aspectos morfofisiológicos de mudas de V. planifolia provenientes de micropropagação sugerem a viabilidade técnica para a propagação em larga escala de mudas dessa espécie. No experimento 2, estudou-se as variáveis morfológicas de mudas de V. planifolia provenientes da proliferação de gemas axilares e da propagação seminífera in vitro, cultivadas em diferentes recipientes e diferentes substratos. O experimento foi realizado em esquema de parcelas subsubdivididas, constituídas pelas combinações entre os fatores: recipiente (sacola e bandeja), substrato (preparado I e preparado II) e muda (micropropagada e plântula), num delineamento inteiramente casualizado, com quatro repetições de oito mudas. A combinação de recipiente sacola, substrato II (solo, areia, esterco de galinha e serrapilheira de mata) e muda micropropagada de gema axilar pode ser usada na produção de mudas de V. planifolia. Palavras-chave: Vanilla planifolia. Carboidrato. Gema axilar. Substrato.
2

NMR-based metabolomic characterization of Vanilla planifolia / Caractérisation métabolomique par RMN de Vanilla planifolia

Palama, Tony 10 June 2010 (has links)
Vanilla planifolia, orchidée épiphite florifère, est la principale source naturelle de l'arôme de vanille. Largement utilisé dans les produits laitiers, les boissons, les pâtisseries et les parfums, cet arôme est le résultat d'un processus complexe : de huit à neuf mois après la fécondation des fleurs, les gousses matures sont récoltées et traitées pendant environ un an afin de libérer leur bouquet aromatique. Aujourd'hui, plus de la moitié de la production mondiale de vanille provient de Madagascar. Pour faire face à cette concurrence, les producteurs de la Réunion se tournent vers la production de vanille "haut de gamme". L'exploitation des vanilliers les plus intéressants du point de vue aromatique est donc favorisée. Toutefois, les programmes d'amélioration se heurtent au manque de connaissances sur la physiologie de la plante. Il devient alors essentiel de mieux comprendre les mécanismes physiologiques et biochimiques impliqués dans la production aromatique des gousses de V. planifolia. Dans ce travail de thèse, une analyse des métabolites présents dans les gousses vertes et les feuilles de vanille a été effectuée par Résonance Magnétique Nucléaire. Cette technique permet l'évaluation qualitative et quantitative des métabolites primaires (sucres, acides animés et organiques...) et secondaires (composés phénoliques...) présents dans la plante dans diverses conditions physiologiques : au cours du développement de la gousse, lors d'une infection virale, selon les saisons ou encore sur différentes accessions. / Vanilla planifolia, a flowering epiphitic orchid, is the major natural source of vanilla flavour. Largely used in dairy products, beverages, bakeries and perfume, vanilla flavour is obtained after a long process: from eight to nine months after flower pollinisation, mature pods are harvested and then prepered during about one year in order to release the characteristic vanilla aroma. Nowadays, more than half vanilla pods world production comes from Madagascar. To face the concurrence, a solution could be develop higher quality pods. Selection of the most aromatic vanilla plant is then preferred. Nevertheless, amelioration program are facing up to a lack of knowledge in vanilla plant physiology. It is now essential to understand more the physiological and biochemical mechanisms implied in the aromatic production of V. planifolia pods. In this thesis, a metabolomic analysis of vanilla green pods and leaves has been performed by nuclear magnetic resonance. This technique has allowed the qualitative and quantitative analysis of primary (sugar, amino and organic acids...) and secondary metabolites (phenolic compounds...) present in vanilla plant according to various physiological conditions: developing pods, viral infection, inter-accession or seasonal variation.

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