Modifications of abscisic acid level in winter oilseed rape leaves during acclimation of plants to freezing temperatures

An almost twofold increase in abscisic acid (ABA) content was observed in the leaves of winter oilseed rape plants (Brassica napus L., var. oleifera L., cv. Jantar) grown in the cold (> 0 degrees C). This ABA increase took place during the first three days of cold treatment. After 6 days of plant...

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Bibliographic Details
Published in:Plant growth regulation 1995-07, Vol.17 (1), p.61-65
Main Authors: Smolenska-Sym, G, Gawronska, H, Kacperska, A
Format: Article
Language:English
Subjects:
abscisic acid
acclimation
Brassica napus var. napus
chemical constituents of plants
freezing
frost resistance
growth
leaf water potential
leaves
quantitative analysis
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Summary:An almost twofold increase in abscisic acid (ABA) content was observed in the leaves of winter oilseed rape plants (Brassica napus L., var. oleifera L., cv. Jantar) grown in the cold (> 0 degrees C). This ABA increase took place during the first three days of cold treatment. After 6 days of plant growth in the cold, the level of ABA started to decline or remained constant, depending on the calculation basis: dry weight or disc area units, respectively. The exposure of cold-acclimated plants to night frost (-5 degrees C for 18 h) induced a further increase (65%) in the ABA level, which begun during the first few hours after thawing. The comparison of time courses of frost resistance increments and ABA content changes showed that modifications of ABA level in the cold-treated leaves preceded those of frost resistance, whereas in the frost-pretreated tissues the ABA increase occurred later than that of frost tolerance. Possible interrelations between ABA content, frost tolerance and tissue water potential modifications in the low temperature-affected tissues are discussed.
ISSN:0167-6903
1573-5087
DOI:10.1007/bf00024496