Hypoxic induction of alcohol and lactate dehydrogenases in lupine seedlings |
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Authors: | Małgorzata Garnczarska |
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Institution: | (1) Department of Plant Physiology, A. Mickiewicz University, Al. Niepodległości 14, 61-713 Poznań, Poland |
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Abstract: | Seedlings of lupine (Lupinus luteus L. cv. Juno) were exposed for up to 96 hours to 1 to 2 kPa partial pressure oxygen (hypoxic treatment) and activities of alcohol
dehydrogenase (ADH), lactate dehydrogenase (LDH) and their isoform profiles were determined. Roots of lupine seedlings were
grown in a nitrogen flushed nutrient solution while their shoots were in air. Prolonged hypoxia led to a reduction of root
elongation. This was accompanied by reduced increase in dry weight suggesting that insufficient carbohydrate supply was the
cause of retarded growth of lupine roots. Hypoxically treated roots showed induction of ADH and LDH acivities. The maximum
increase in LDH activity was low (2-fold) in contrast to ADH activity, which increased up to 7-fold. Hypoxic treatment of
roots did not affect the activities of ADH and LDH in hypocotyls and cotyledons. Analysis of ADH and LDH activity gels indicated
in roots 1 and 2 isoforms, respectively. The level of isozymes of both enzymes increased in roots upon exposure to hypoxic
stress. Differences in isoenzymatic spectrum of ADH and LDH between roots, hypocotyls and cotyledons indicate organ specificity
of isozymes of both enzymes. The importance of alcohol and lactate fermentation in roots to cope with hypoxic stress is discussed. |
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Keywords: | alcohol dehydrogenase fermentation hypoxia lactate dehydrogenase lupine |
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