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    Wyświetlanie 1-2 z 2
    Tytuł:
    Pattern of carbohydrate changes in maturing xylem and phloem during growth to dormancy transition phase in Picea abies (L.) Karst.
    Autorzy:
    Traversari, S.
    Emiliani, G.
    Traversi, M.L.
    Anichini, M.
    Giovannelli, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078285.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Cell wall biosynthesis
    latewood
    starch
    sugars
    wood formation
    wood quality
    Opis:
    Wood production is a metabolic process requiring high amount of soluble carbohydrates as source of carbon skeletons, energy, or signalling molecules. Nevertheless, the role of soluble sugars and starch has been rarely investigated in the growth to dormancy transition phase. The aim of this work was to investigate the carbohydrate concentrations and the transcription level of some candidate genes involved in cellulose and starch metabolisms in competitive carbon sinks such as phloem, maturing xylem, and xylem during the active growth to dormancy transition phase in Picea abies (L.) Karst. Stems were sampled every two weeks between July and October from potted eight-year-old Norway spruce plants. Results highlight that the cel- lulose biosynthesis regulated the pattern of carbohydrate changes in the phloem and maturing xylem during the transition to dormancy. In particular, the cessation of CesA (α-cellulose synthase) mRNA accumulation in maturing xylem determined a shift in the carbohydrate partitioning from the utilization sinks to the storage compartment. The content of carbohydrates was modulated in the maturing xylem by cellulose metabolism during the xylogenesis and by starch metabolism during the cambium dormancy. On the contrary, the carbon competition between utilization and storage sinks seemed to be less connected within the phloem. Since the amount of soluble carbohydrates within the maturing xylem and phloem has never been limited during the growth to dormancy transition phase, the cessation of the CesA transcription was probably determined by environmental conditions rather than by carbon limitation or sink competition.
    Źródło:
    Dendrobiology; 2018, 80; 12-23
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seasonal dynamics in cambial activity and the formation of xylem and phloem in the branches of Cinnamomum camphora
    Autorzy:
    Dong, M.
    Xu, Y.M.
    Lin, H.
    Li, X.Q.
    Xia, Q.Q.
    Powiązania:
    https://bibliotekanauki.pl/articles/41385.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    seasonal dynamics
    cambial activity
    formation
    xylem
    phloem
    branch formation
    tree
    tropical tree
    Cinnamomum camphora
    wood formation
    phenology
    Opis:
    The cambial activity and periodicity of secondary xylem and phloem formation have been less studied in tropical tree species than in temperate ones. Cambium activity is the only source of timber production. Studies on its activity and xylem formation can provide helpful data for dendrochronology and possible factors that control tree growth, the yield and quality of wood. Cinnamomum camphora is an important fast-growing tree for furniture and sculpture wood in South China. Its dynamics of cambial activity was not reported. During the growth season in 2011, five trees of Cinnamomum camphora plantation were monitored on the campus of Huazhong Agricultural University in central china (located on 113°41’ to 115°05’ E and 29°58’ to 31°22’ N). Sampling time was from 13, February 2011 to 13, February 2012. Some small stems of 15–20 cm length were selected to sample in the middle of 2–3 years old health branches in the central crown of these trees. The observational study found that the cambium of camphor trees was active from March to October and dormant from November to February. Onset of cambial cell division was observed in early March, one week after sprouting of new buds. The morphology of the cells and number of cell layers in the cambium zone varied throughout the year. In early March, cambium reactivated with the rising of temperature, the cell wall was relative thick. The number of cell layers increased from 2–3 in middle Feb. to 3–5. In June, the number of cell layers in cambium reached the maximum of 5–7 in a radial direction. In mid March, phloem cells began to differentiate, followed by xylem three weeks later. The number of cell layers in immature phloem and xylem increased dramatically before mid June and the increment of cell layers in xylem was almost fifth times of phloem in the differentiating process. The phloem cells mainly stopped dividing new cells in end of October, but xylem cells were still in the activity a week later. The annual activities of cambium was in accordance with the air mean temperature change in 2011–2012. The results showed that the cambial activity and formation of xylem and phloem were related to the environmental factors, especially the temperature.
    Źródło:
    Dendrobiology; 2016, 75
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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