Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/195080
Type: Artigo de periódico
Title: Parameters Affecting The Early Seedling Development Of Four Neotropical Trees Under Oxygen Deprivation Stress.
Author: Kolb, Rosana Marta
Rawyler, André
Braendle, Roland
Abstract: 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.
Subject: Adenosine Monophosphate
Adenosine Triphosphate
Alcohol Dehydrogenase
Anaerobiosis
Carbohydrate Metabolism
Energy Metabolism
Ethanol
Euphorbiaceae
Fabaceae
Fatty Acids
Fermentation
Germination
Lactic Acid
Oxygen
Rna, Messenger
Seeds
Time Factors
Trees
Tropical Climate
Rights: fechado
Identifier DOI: 
Address: http://www.ncbi.nlm.nih.gov/pubmed/12099528
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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