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Seasonal dynamics of phloem formation in Silver fir and Norway spruce as affected by drought
Gričar, Jožica (Author), Čufar, Katarina (Author)

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Abstract
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.

Language:English
Keywords:Picea abies, Abies alba, phloem, sieve cells, cambial activity, cell differentiation, light microscopy
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2008
Publisher:Interperiodica: Russian Academy of Sciences
Number of pages:Str. 538-543
Numbering:Vol. 55, no. 4
UDC:630
ISSN on article:1021-4437
DOI:10.1134/S102144370804016X This link opens in a new window
COBISS.SI-ID:1643401 This link opens in a new window
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Downloads:640
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Record is a part of a journal

Title:Russian journal of plant physiology
Shortened title:Russ. j. plant physiol.
Publisher:Interperiodica, Russian Academy of Sciences
ISSN:1021-4437
COBISS.SI-ID:43326721 This link opens in a new window

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