Back to Search
Start Over
Sugar utilization and anoxia tolerance in rice roots acclimated by hypoxic pretreatment
- Source :
- Journal of Plant Physiology. 161:803-808
- Publication Year :
- 2004
- Publisher :
- Elsevier BV, 2004.
-
Abstract
- Although most cereal roots cannot elongate under anoxic conditions, primary roots of three-day-old rice (Oryza sativa L.) seedlings were able to elongate during a 24-h period of anoxia. Hypoxic pretreatment (H-PT) increased the elongation of their roots. Sucrose synthase (EC 2.4.1.13), glucokinase (EC 2.7.1.2), fructokinase (EC 2.7.1.4), pyruvate decarboxylase (EC 4.1.1.1) and alcohol dehydrogenase (EC 1.1.1.1) activities were increased by anoxia in both H-PT and non-pretreated (N-PT) roots. However, these activities were greater in the H-PT roots than in the N-PT roots. The average rate of production of ethanol for the initial 6h after the onset of anoxia was 3.7 and 1.4 micromolg(-1) fresh weight h(-1) for the H-PT and N-PT roots, respectively, suggesting that ethanolic fermentation may increase more quickly in the H-PT roots than in the N-PT roots. Roots of the seedlings lost ATP and total adenine nucleotides in anoxia, however, the H-PT roots maintained higher levels of ATP and total adenine nucleotides compared to the N-PT roots. These results show that rice roots are able to utilize the set of enzymes involved in the metabolism of soluble sugars under anoxia. The ability to maintain an active fermentative metabolism for production of ATP by fueling the glycolytic pathway with fermentable carbohydrate is probably greater in H-PT than in N-PT roots.
- Subjects :
- Physiology
Acclimatization
Plant Science
Carbohydrate metabolism
Plant Roots
Fructokinase
Fructokinases
Adenosine Triphosphate
Adenine nucleotide
Glucokinase
Botany
Glycolysis
Alcohol dehydrogenase
Ethanol
biology
Alcohol Dehydrogenase
Oryza
Metabolism
Oxygen
Horticulture
Glucosyltransferases
biology.protein
Carbohydrate Metabolism
Sucrose synthase
Pyruvate Decarboxylase
Agronomy and Crop Science
Pyruvate decarboxylase
Subjects
Details
- ISSN :
- 01761617
- Volume :
- 161
- Database :
- OpenAIRE
- Journal :
- Journal of Plant Physiology
- Accession number :
- edsair.doi.dedup.....53bd26b8a0997263442f8612fef4c3a6
- Full Text :
- https://doi.org/10.1016/j.jplph.2003.11.004