The Physiology of Epicormic Bud Emergence in Pedunculate Oak (Quercus robur L.) Responses to Partial Notch Girdling in Thinned and Unthinned Stands

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Abstract
The physiology of epicormic bud development in Quercus robur was studied by recording the effect of partial notch girdles applied at different dates, in the spring and summer of 1985, on epicormic shoot emergence in stands of thinned and unthinned trees. The girdles were applied singly or in tandem pairs one above the other. In one experiment they were applied in combination with the synthetic auxin 1-napthaleneacetic acid (NAA) or were replaced by treatment with 2, 3, 5-triiodobenzoic acid (TIBA), an inhibitor of auxin transport. Thinning had no consistent effect on the numbers of epicormic shoots emerging, only on their later vigour, and did not consistently affect the response to girdling or the growth regulator treatments. Epicormic shoot emergence was stimulated only by girdling treatments applied in April and May, and not in June or August, indicating that the epicormic buds enter dormancy early in the season. The pattern of responses to the single and tandem girdles was consistent with a suppression of the buds in the spring by a basipetally-transported inhibitor, from the inhibitory effect of NAA observed, probably auxin. The development of the buds was not controlled by an acropetafly-transported promoter whose supply could be interrupted by the girdling treatments.

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