Induction of PEP carboxylase and crassulacean acid metabolism by gibberellic acid in Mesembryanthemum crystallinum.
The induction of Crassulacean acid metabolism in M:esembryanthemum crystallinum was investigated in response to foliar application of gibberellic acid (GA). After 5 weeks of treatment, GA-treated plants showed 1.7- to almost a 4-fold increase of phosphoenolpyruvate carboxylase (PEPcase) activity with a concomitant increase in acid metabolism when compared to control plants. Immunoblot analysis indicated an increase in the PEPcase protein similar to that of salt treatment while Rubisco did not show a similar rise. The results indicate that exogenously applied GA accelerates plant developmental expression of PEPcase and Crassulacean acid metabolism in M: crystallinum.
Division of Natural Science and Mathematics, Western Oregon University, Monmouth, OR 97361, USA. guralnl@wou.edu
L J
LJ
Guralnick
M S
MS
Ku
G E
GE
Edwards
D
D
Strand
B
B
Hockema
J
J
Earnest
D004790:Enzyme Induction; D005875:Gibberellins / Q000378:metabolism*; D010730:Phosphoenolpyruvate Carboxylase / Q000096:biosynthesis*; D018515:Plant Leaves / Q000378:metabolism; D010944:Plants / Q000201:enzymology* / Q000378:metabolism; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism
D005875:Gibberellins; C007842:gibberellic acid; D010730:Phosphoenolpyruvate Carboxylase; D012273:Ribulose-Bisphosphate Carboxylase