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.
Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies
Informacja
SZANOWNI CZYTELNICY!
UPRZEJMIE INFORMUJEMY, ŻE BIBLIOTEKA FUNKCJONUJE W NASTĘPUJĄCYCH GODZINACH:
Wypożyczalnia i Czytelnia Główna: poniedziałek – piątek od 9.00 do 19.00