ISSN:
1573-5087
Keywords:
polyamine
;
acid stress
;
superoxide dismutase
;
catalase
;
macromolecular synthesis
;
putrescine
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Wheat or oat leaf segments were floated on acid solutions and the changes in several parameters measured. The putrescine content of wheat leaves was 12.8-fold greater at pH 3.5 than at pH 6 after 72 h. The increase in putrescine was accompanied by an increase in the amount of K+ efflux from the leaf tissue to the external solution. The activities of superoxide dismutase and catalase of wheat leaves at pH 3.5 decreased to 51% and 40%, respectively, of their levels at pH 6 by 24 h. [3H]Uridine and [3H]leucine incorporation into macromolecules in oat leaves (with the lower epidermis removed) decreased to 58% and 28% of the control in response to acid stress in 8 h, at the same time as a 5-fold increase in putrescine. When DL-α-difluoro-methyarginine was added to the pH 3.5 buffered solution, the effect of acid was slightly less, with the incorporation into macromolecules being 64% and 35% of the pH 6 control. The results indicated that the putrescine accumulation under acid stress was concomitant with ion efflux, and a decrease in both macromolecular synthesis and the activities of superoxide dismutase and catalase in cereal leaves.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00024134
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