Open AccessAbscisic acid as a factor in regulation of photosynthetic carbon metabolism of pea seedlings
Author(s) -
M. Faltynowicz,
Waldemar Lechowicz,
J. Poskuta
Publication year - 2014
Publication title -
acta societatis botanicorum poloniae
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 29
eISSN - 2083-9480
pISSN - 0001-6977
DOI - 10.5586/asbp.1982.020
Subject(s) - abscisic acid , phosphoenolpyruvate carboxylase , photosynthesis , pyruvate carboxylase , fructose , sugar phosphates , phosphoenolpyruvate carboxykinase , metabolism , biochemistry , rubisco , sucrose , carboxylation , sugar , fructose 2,6 bisphosphate , chemistry , biology , enzyme , glycolysis , phosphofructokinase , gene , catalysis
The influence of abscisic acid (ABA) on carbon metabolism and the activity of ribulosebisphosphate (RuBP) and phosphoenolpyruvate (PEP) carboxylases in 8-day-old pea seedlings was investigated. It was endeavoured to correlate the changes observed in metabolic processes with the endogenous ABA level. In plants treated with ABA incorporation of labeled carbon into sucrose, glucose, fructose and sugar phosphates was depressed, while 14C incorporation into starch, ribulose and malic acid was enhanced. The activity of RuBP carboxylase was considerably lowered, whereas that of PEP carboxylase was slightly increased. It is considered that inhibition of photosynthesis due to the action of ABA is caused to a great extent by the obstruction of the C-3 pathway and reduced activity of RuBP carboxylase, whereas (β-carboxylation was not blocked