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© 1992 Oxford University Press

RESEARCH-ARTICLE

Arrested Leaf Abscission in the Non-Abscising Variety of Pubescent Birch: Developmental,Morphological and Hormonal Aspects

PÄIVI RINNE1,4, HANNELE TUOMINEN2 and OLAVI JUNTTILA3

1Department of Botany, University of Oulu Lmnanmaa, SF–90570 Oulu, Finland
2Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences S–90183 Umeâ, Sweden
3Department of Plant Physiology and Microbiology University of Tromso N–9000 Tromsø, Norway

4To whom correspondence should be addressed.

A novel type of abscission development, arrested abscission, is described for a rare variety of pubescent birch (Betula pubescens Ehrh. f. hibernifolia Ulvinen), the leaves of which dehydrate and remain attached to the plant. Anatomical examination of the abscission zone revealed that its development is temporally and spatially similar to that of normal leaves of Betula pubescens.Flooding and exogenous ethylene were effective in inducing shedding of the leaves at the beginning of the growing season, butthis effect was lost in senescing leaves. Leaf hydration and abscission were retained in the presence of external abscisic acid (ABA)in the non-abscising variety, which also had a lower level of endogenous ABA. The observed responses together with the alteredhormonal level in this variety suggest that apart from ethylene, ABA is involved in autumnal abscission indirectly by regulatingthe leaf water status.

Key words: ABA deficiency, abscisic acid, abscission zone, ethylene, senescenc


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