Blar i forfatter "Samkumar, Amos"

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    • Effect of light quality on the biosynthesis of flavonoids and sugars in bilberry (Vaccinium myrtillus L.) 

      Samkumar, Amos (Doctoral thesis; Doktorgradsavhandling, 2021-12-09)
      Berries are abundant in bioactive compounds. Bilberry or European blueberry (<i>Vaccinium myrtillus</i> L.) is in particular gaining worldwide attention being one of the best natural sources of antioxidant rich phenolics that accumulate in both skin and flesh during fruit ripening. Alongside, the ubiquitous presence of anthocyanins and related flavonoids, it also contains other compounds such as ...

    • Flavonoid biosynthesis is differentially altered in detached and attached ripening bilberries in response to spectral light quality 

      Samkumar, Amos; Karppinen, Katja; McGhie, Tony K.; Espley, Richard V.; Martinussen, Inger; Jaakola, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-22)
      Light spectral quality is known to affect flavonoid biosynthesis during fruit ripening. However, the response of fruits to different light conditions, when ripening autonomously from the parent plant (detached), has been less explored. In this study, we analyzed the effect of light quality on detached and naturally ripening (attached) non-climacteric wild bilberry (Vaccinium myrtillus L.) fruits ...

    • Influence of Arctic light conditions on crop production and quality 

      Mølmann, Jørgen A; Dalmannsdottir, Sigridur; Hykkerud, Anne Linn; Hytönen, Timo; Samkumar, Amos; Jaakola, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-10)
      The natural light conditions above the Arctic Circle are unique in terms of annual variation creating special growth conditions for crop production. These include low solar elevations, very long daily photosynthetic light periods, midnight sun/absence of dark nights, and altered spectral distribution depending on solar elevation. All these factors are known to affect the growth and the metabolism ...

    • Insights into sugar metabolism during bilberry (Vaccinium myrtillus L.) fruit development 

      Samkumar, Amos; Karppinen, Katja; Dhakal, Binita; Martinussen, Inger; Jaakola, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-03)
      Bilberry fruit is regarded as one of the best natural sources of anthocyanins and iswidely explored for its health-beneficial compounds. Besides anthocyanins, one of themajor attributes that determine the berry quality is the accumulation of sugars thatprovide sweetness and flavor to ripening fruit. In this study, we have identified 25 sugarmetabolism-related genes in bilberry, including invertases ...

    • Red and blue light treatments of ripening bilberry fruits reveal differences in signalling through abscisic acid-regulated anthocyanin biosynthesis 

      Samkumar, Amos; Jones, Dan; Karppinen, Katja; Dare, Andrew P.; Sipari, Nina; Espley, Richard V.; Martinussen, Inger; Jaakola, Laura (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-08-01)
      The biosynthesis of anthocyanins has been shown to be influenced by light quality. However, the molecular mechanisms underlying the light-mediated regulation of fruit anthocyanin biosynthesis are not well understood. In this study, we analysed the effects of supplemental red and blue light on the anthocyanin biosynthesis in non-climacteric bilberry (<i>Vaccinium myrtillus</i> L.). After 6 days of ...