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Plant Biol (Stuttg) 2003; 5(5): 557-566
DOI: 10.1055/s-2003-44791
Original Paper

Georg Thieme Verlag Stuttgart · New York

Antioxidant and Pigment Composition during Autumnal Leaf Senescence in Woody Deciduous Species Differing in their Ecological Traits

J. I. García-Plazaola 1 , A. Hernández 1 , J. M. Becerril 1
  • 1Department of Plant Biology and Ecology, Universidad del País Vasco-EHU, Bilbao, Spain
Further Information

Publication History

Publication Date:
27 November 2003 (online)

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Abstract

Photoprotection mechanisms have been studied during autumnal senescence in sun and shade leaves of woody plants with different ecological characteristics and senescence patterns. Three of them belonging to the same family, Betulaceae: the shade-intolerant and early successional species (Betula alba L.), the shade-tolerant and late successional species (Corylus avellana L.), and an N-fixing tree with low N resorption efficiency (Alnus glutinosa L.). The other two species: a shade-intolerant (Populus tremula L.) and a shade-tolerant (Cornus sanguinea L.), were chosen because of their ability to accumulate anthocyanins during autumnal leaf senescence. The study of plants with different ecological strategies allowed us to establish general trends in photoprotection mechanisms during autumnal senescence, when nutrient remobilisation occurs, but also during whole leaf ontogeny. We have not found a clear relationship between shade tolerance and the level of photoprotection; the main difference between both groups of species being the presence of α-carotene in shade leaves of shade-tolerant species. Preceding autumn, nitrogen resorption started in mid-summer and occurred in parallel with a slight and continuous ascorbate, chlorophyll and carotenoid degradation. However, the ascorbate pool remained highly reduced and lipid oxidation did not increase at this time. Contrasting with ascorbate, α-tocopherol accumulated progressively in all species. Only during the last stages of senescence was chlorophyll preferentially degraded with respect to carotenoids, leading to the yellowing of leaves, except in A. glutinosa in which a large retention of chlorophyll and N took place. Senescing leaves were characterised, except in C. sanguinea, by a relative increase in the proportion of de-epoxidised xanthophylls: zeaxanthin, antheraxanthin and lutein. The light-induced accumulation of anthocyanins in C. sanguinea could play an additional protective role, compensating for the low retention of de-epoxidised xanthophylls. These different strategies among deciduous species are consistent with a role for photoprotective compounds in enhancing nitrogen remobilization and storage for the next growing season.

Key words

Anthocyanins - ascorbate - carotenoids - nitrogen remobilization - α-tocopherol - shade tolerance - xanthophyll cycle

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J. I. García-Plazaola

Department of Plant Biology and Ecology
Universidad del País Vasco-EHU

Apdo 644

48080 Bilbao

Spain

Email: gvpgaplj@lg.ehu.es

Section Editor: M. C. Ball