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Annals of Botany 89: 551-558, 2002
© 2002 Annals of Botany Company

Parameters Affecting the Early Seedling Development of Four Neotropical Trees under Oxygen Deprivation Stress

ROSANA MARTA KOLB*,1, ANDRÉ RAWYLER2 and ROLAND BRAENDLE2

1Department of Plant Physiology, IB, State University of Campinas/UNICAMP, P.O. Box 6109, 13084–971, Campinas, Brazil and 2Institute of Plant Sciences, University of Berne, Altenbergrain, 21, CH 3013, Berne, Switzerland

* For correspondence. Fax: +55 19 3788 6111, e-mail rkolb{at}unicamp.br

Received: 15 October 2001; Returned for revision: 11 January 2002; Accepted: 4 February 2002.

Some of the parameters that determine flooding resistance—and consequently habitat zonation—were investigated in four neotropical trees (Schizolobium parahyba, Sebastiania commersoniana, Erythrina speciosa and Sesbania virgata). The constitutive parameters of seeds (size, nature and amount of reserves) only partly influenced resistance to flooding, mainly through a high carbohydrate : size ratio. Parameters describing metabolic efficiency under stress conditions were more important. Among them, fermentation capacity and levels of ATP and of total adenylates played a key role. The highest resistance to anoxia was associated with increased availability of free sugars, elevated alcohol dehydrogenase activity and corresponding mRNA levels, more efficient removal of ethanol and lactate, and higher adenylate levels. Finally, as a lethal consequence of energy shortage, free fatty acids were released on a massive scale in the flooding-sensitive species Schizolobium parahyba, whereas lipid hydrolysis did not occur in the most resistant species Sesbania virgata.

Key words: Adenylate levels, energy shortage, fermentation capacity, flooding resistance, habitat zonation, lipid hydrolysis, metabolism, seed reserves, Erythrina speciosa, Schizolobium parahyba, Sebastiania commersoniana, Sesbania virgata.


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