Jožica Gričar (Avtor), Katarina Čufar (Avtor)

Povzetek

The dynamics of phloem growth ring formation in silver fir (Abies alba Mill.) and Norway spruce (Picea abies Karst.) at different sites in Slovenia during the droughty growing season of 2003 was studied. We also determined the timing of cambial activity, xylem and phloem formation, and counted the number of cells in the completed phloem and xylem growth rings. Light microscopy of cross-sections revealed that cambial activity started on the phloem and xylem side simultaneously at all 3 plots. However, prior to this, 1-2 layers of phloem derivatives near the cambium differentiated without previous divisions.The structure of the early phloem was similar in silver fir and Norway spruce. Differences in the number of late phloem cells were found among sites. Phloem growth rings were the widest in Norway spruce growing at the lowland site. In all investigated trees, the cambium produced 5-12 times more xylem cells than phloem ones. In addition, the variability in the number of cells in the 2003 growth ring around the stem circumference of the same tree and among different trees was higher on the xylem side than on the phloem side. Phloem formation is presumably less dependent on environmental factors but is more internally driven than xylem formation.

Ključne besede

Picea abies;Abies alba;phloem;sieve cells;cambial activity;cell differentiation;light microscopy;

Podatki

Jezik: Angleški jezik
Leto izida:
Tipologija: 1.01 - Izvirni znanstveni članek
Organizacija: UL BF - Biotehniška fakulteta
Založnik: Interperiodica: Russian Academy of Sciences
UDK: 630
COBISS: 1643401 Povezava se bo odprla v novem oknu
ISSN: 1021-4437
Št. ogledov: 1242
Št. prenosov: 681
Ocena: 0 (0 glasov)
Metapodatki: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Ostali podatki

Sekundarni jezik: Neznan jezik
Vrsta datoteke: application/pdf
Vrsta dela (COBISS): Delo ni kategorizirano
Strani: str. 538-543
Letnik: ǂVol. ǂ55
Zvezek: ǂno. ǂ4
Čas izdaje: 2008
DOI: 10.1134/S102144370804016X
ID: 8631680