Archives of Biological Sciences 2012 Volume 64, Issue 1, Pages: 85-95
https://doi.org/10.2298/ABS1201085B
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Some characters of the pollen of spring and summer flowering common oak (Quercus robur L.)
Batos Branislava (Institute of Forestry, Belgrade)
Miljković Danijela (Institute for Biological Research ”Siniša Stanković”, Belgrade)
Bobinac M. (Faculty of Forestry, Belgrade)
Summer flowering of the common oak is a natural rarity, considering the large
area of the species natural distribution. This phenomenon can be classified
as an ancestral (atavistic) property. Pollen morphological and physiological
characters from spring flowering male inflorescences collected over the
period 2004 - 2007 and summer flowering male inflorescences collected in 1999
were compared. The analysis included the pollen of a tree with frequent
summer flowering and a control tree with spring flowering only. The size and
form of summer pollen differed from the spring flowering pollen. The
germination percentage and germination energy depended on the pollen growing
medium (0, 5, 10, 15, 20, 25% sucrose solution), year of collection (2004 -
2007), temperature (+5°C and -20°C) and storage period (1 to 24 months). The
study results are significant for the explanation of common oak phylogenetic
development, and they contribute to the knowledge of pollen characters under
the effects of different factors.
Keywords: Quercus robur L., spring and summer flowering, pollen, morphology, germination percentage, germination energy, storage