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- W1979599481 abstract "In Cichorium intybus L. (endive), it has been shown that the transformation of vegetative primordia into floral primordia is controlled by the nature (liquid or solid) of nutrient medium. When root pieces have been put on filter-paper dipped in liquid medium, the tissues were hydrated and produced only vegetative buds. When the medium was solidified by the addition of agar, the meristems produced floral buds. The hypothesis of flower-promoting susbstances being present in agar could be eliminated as it has been possible to obtain floral buds on a different non-agar solid medium. Floral initiation on agar medium can be inhibited also by raising the relative humidity of the sorrounding atmosphere. In this case, the water tissue content can be maintained at a high level and regenerated buds remain vegetative. An increase of free proline and free arginine in agar medium-cultured tissues was shown while, at the same time, these amino acids are decreasing in tissues maintained on liquid medium. Chez Cichorium intybus L., l'influence déterminante de la nature du substrat de culture sur la néoformation de bourgeons floraux a été mise en évidence. Cultivés sur un milieu liquide, les tissus sont trés hydratés et donnent naissance à des bourgeons qui demeurent à l'état végétatif. Par contre, sur le même milie nutritif solidifié par de la gélose, les bourgeons néoformés développent des inflorescences. L'hypothèse de l'effet stimulant de substances éventuellement contenues dans la gélose a pu être rejetée d'une part en déclenchant l'initiation florale sur des milieux non gélosés (dont le milieu liquide), et d'autre part en empêchant la néoformation de fleurs sur milieu gélosé par l'élévation du degré d'humidité de l'atmosphére entourant les cultures. L'influence du degré d'hydratation s'exerce précocement dés la première semaine de culture. L'évolution de certains acides aminés (proline, arginine) est nettement influencée par les conditions de la culture. En particulier, les teneurs en proline libre augmentent dans les tissus cultivés sur milieu gélosé durant la phase de différenciacion des bourgeons floraux, tandis qu'au même moment, une diminution apparaît au contraire dans les tissus cultivés sur milieu liquide." @default.
- W1979599481 created "2016-06-24" @default.
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- W1979599481 date "1974-06-01" @default.
- W1979599481 modified "2023-09-23" @default.
- W1979599481 title "Néoformation de bourgeons floraux in vitro à partir de fragments de racine d'endive cichorium intybus L.: influence du degré d'hydratation des tissus, et ses consequences sur la composition en acides amines" @default.
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- W1979599481 doi "https://doi.org/10.1016/0304-4211(74)90045-5" @default.
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