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Bud growth on control and heated seedlings. Buds had not yet burst on 1 February (A) and 27 March, when cambial cell divisions were observed in heated and heated plus disbudded seedlings (B). Swelling of buds was observed on 13 April, when natural cambial reactivation and the differentiation of vessel elements were observed (C). Bud burst had occurred by 25 April (D). Scale bars = 0·5 cm.
