Abstract
Endogenous gibberellins (GAs) were extracted from flushing (expanding) vegetative buds of river alder (Alnus tenuifolia), European white birch (Betula pendula), and aspen (Populus tremuloides) and identified by gas chromatography-mass spectrometry with full scans and/or selected ion monitoring. Five 13-hydroxylated GAs were detected from the three trees: GA1, 8, and 20 from alder, GA1, 8, 19 and 20 from aspen and GA1, 8, 19, 20, and 29 from birch. Thirteen other GAs previously detected in Salix or common in other plants were specifically investigated but not detected. The presence of GA1, its probable precursors GA19 and GA20, and its probable metabolite, GA8, suggests that the early 13-hydroxylated GA biosynthetic pathway is dominant in vegetative buds of these trees. Abundant endogenous GAs of these trees are similar to the principal GAs of willows (various Salix spp.) and poplars (various Populus spp.). This suggests similarities in the GA physiology and is consistent with a common role of GA1 as a regulator of shoot growth in woody angiosperms.
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Zanewich, K.P., Rood, S.B. Endogenous gibberellins in flushing buds of three deciduous trees: Alder, aspen, and birch. J Plant Growth Regul 13, 159–162 (1994). https://doi.org/10.1007/BF00196381
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DOI: https://doi.org/10.1007/BF00196381