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Literature summary 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

Application

EC Number Application Comment Organism
1.14.18.1 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

EC Number Metals/Ions Comment Organism Structure
1.14.18.1 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

EC Number Organism UniProt Comment Textmining
1.14.18.1 Zea mays
-
 cv. Arifiye
-

Source Tissue

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

Specific Activity [micromol/min/mg]

EC Number Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
1.14.18.1 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)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
1.14.18.1 caffeic acid + 1/2 O2
-
 Zea mays caffeoyl quinone + H2O
-
 ?
1.14.18.1 catechol + 1/2 O2
-
 Zea mays 1,2-benzoquinone + H2O
-
 ?
1.14.18.1 dopa + 1/2 O2
-
 Zea mays dopaquinone + H2O
-
 ?
1.14.18.1 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 ?
-
 ?
1.14.18.1 tyrosine + O2 + AH2
-
 Zea mays dopa + H2O + A
-
 ?

Synonyms

EC Number Synonyms Comment Organism
1.14.18.1 polyphenol oxidase
-
 Zea mays
1.14.18.1 PPO
-
 Zea mays