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Literature summary for 1.14.18.1 extracted from

  • Olcer, H.; Kocacaliskan, I.
    Excess boron reduces polyphenol oxidase activities in embryo and endosperm of maize seed during germination (2007), Z. Naturforsch. C, 62, 111-115.
    View publication on PubMed
Search for more literature for 1.14.18.1

Application

Application Comment Organism
agriculture application of boron at high concentrations (10 and 20 mM) to maize seeds or even application very near to the seeds is not advisable Zea mays

Metals/Ions

Metals/Ions Comment Organism Structure
boron boron in an essential micronutrient required for growth and development of plants. Boron treatments: Germination of maize seeds is not effected by boron concentrations up to 10 mM but decreased by 20 mM boron. Excess boron lowers the PPO activity in seed tissues during germination of maize. Time course of PPO activities in embryo and endosperm of maize seeds treated with boron during and following germination is shown Zea mays

Organism

Organism UniProt Comment Textmining
Zea mays
-
 cv. Arifiye
-

Source Tissue

Source Tissue Comment Organism Textmining
embryo of maize seeds Zea mays
-
endosperm of maize seeds Zea mays
-
seed
-
 Zea mays
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
additional information
-
 time course of PPO activities in embryo and endosperm of maize seeds treated with boron during and following germination is shown Zea mays

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
caffeic acid + 1/2 O2
-
 Zea mays caffeoyl quinone + H2O
-
 ?
catechol + 1/2 O2
-
 Zea mays 1,2-benzoquinone + H2O
-
 ?
dopa + 1/2 O2
-
 Zea mays dopaquinone + H2O
-
 ?
additional information catalyse the hydroxylation of monophenols to o-dihydroxyphenols (E.C. 1.14.18.1), and the oxidation of o-dihydroxyphenols to o-quinones (E.C. 1.10.3.2). PPO activities with diphenolic substrates are higher than with monophenolic substrate (tyrosine) in both embryo and endosperm tissues. Time course of PPO activities in embryo and endosperm of maize seeds treated with boron during and following germination is shown Zea mays ?
-
 ?
tyrosine + O2 + AH2
-
 Zea mays dopa + H2O + A
-
 ?

Synonyms

Synonyms Comment Organism
polyphenol oxidase
-
 Zea mays
PPO
-
 Zea mays