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

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 reserv...

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Bibliographic Details
Published in:Annals of botany 2002-05, Vol.89 (5), p.551-558
Main Authors: KOLB, ROSANA MARTA, RAWYLER, ANDRÉ, BRAENDLE, ROLAND
Format: Article
Language:English
Subjects:
Adenosine Monophosphate - metabolism
Adenosine Triphosphate - metabolism
Alcohol Dehydrogenase - biosynthesis
Anaerobiosis
Anoxia
Carbohydrate Metabolism
Energy Metabolism - physiology
Ethanol
Ethanol - metabolism
Euphorbiaceae - growth & development
Euphorbiaceae - metabolism
Fabaceae - growth & development
Fabaceae - metabolism
Fatty Acids - metabolism
Fermentation
Fermentation - physiology
Germination - physiology
Lactic Acid - metabolism
Lipids
Nonesterified fatty acids
Original
Oxygen
Oxygen - metabolism
Plant physiology
Plants
RNA, Messenger - metabolism
Seedlings
Seeds - growth & development
Seeds - metabolism
Sugars
Time Factors
Trees - growth & development
Trees - metabolism
Tropical Climate
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Summary: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.
ISSN:0305-7364
1095-8290
DOI:10.1093/aob/mcf092