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Fermentative metabolism is induced by inhibiting different enzymes of the branched-chain amino acid biosynthesis pathway in pea plants
- Source :
- Journal of agricultural and food chemistry. 53(19)
- Publication Year :
- 2005
-
Abstract
- The inhibition of branched-chain amino acid (BCAA) biosynthesis was evaluated in pea plants in relation to the ability for induction of fermentative metabolism under aerobic conditions. Chlorsulfuron and imazethapyr (inhibitors of acetolactate synthase, ALS, EC 4.1.3.18) produced a strong induction of pyruvate decarboxylase (PDC, EC 4.1.1.1) and alcohol dehydrogenase (ADH, EC 1.1.1.1) activities and a lesser induction of lactate dehydrogenase (LDH, EC 1.1.1.27) and alanine aminotransferase (AlaAT, EC 2.6.1.2) activities in roots. Inhibition of the second enzyme of the BCAA biosynthesis (ketol-acid reductoisomerase, KARI, EC 1.1.1.86) by Hoe 704 (2-dimethylphosphinoyl-2-hydroxyacetic acid) and CPCA (1,1-cyclopropanedicarboxylic acid) enhanced fermentative enzyme activities including PDC, ADH, and AlaAT. Fermentative metabolism induction occurring with ALS- and KARI-inhibitors was related to a higher expression of PDC. In the case of KARI inhibition, it is proposed that fermentation induction is due to an inhibition of ALS activity resulted from an increase in acetolactate concentration. Fermentative metabolism induction in roots, or at least ethanolic fermentation, appeared to be a general physiological response to the BCAA biosynthesis inhibition.
- Subjects :
- chemistry.chemical_classification
Acetolactate synthase
biology
Branched-chain amino acid
Ketol-Acid Reductoisomerase
Peas
General Chemistry
Metabolism
Plant Roots
chemistry.chemical_compound
Acetolactate Synthase
Alcohol Oxidoreductases
Enzyme
chemistry
Biosynthesis
Biochemistry
Lactate dehydrogenase
Fermentation
biology.protein
Enzyme Inhibitors
General Agricultural and Biological Sciences
Pyruvate decarboxylase
Amino Acids, Branched-Chain
Alcohol dehydrogenase
Subjects
Details
- ISSN :
- 00218561
- Volume :
- 53
- Issue :
- 19
- Database :
- OpenAIRE
- Journal :
- Journal of agricultural and food chemistry
- Accession number :
- edsair.doi.dedup.....7f8b13277fc0daa8f1b0d383d107b988