Correlation between Ornithine Decarboxylase and Putrescine in Tomato Plants Infected by Citrus Exocortis Viroid or Treated with Ethephon | Zendy

José Marı́a Bellés | Zendy; Miguel A. PérezAmador | Zendy; Juan Carbonell | Zendy; Vicente Conejero | Zendy

Open Access

Correlation between Ornithine Decarboxylase and Putrescine in Tomato Plants Infected by Citrus Exocortis Viroid or Treated with Ethephon

Author(s) -

José Marı́a Bellés,

Miguel A. PérezAmador,

Juan Carbonell,

Vicente Conejero

Publication year - 1993

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.102.3.933

Subject(s) - ethephon , putrescine , ornithine decarboxylase , polyamine , viroid , lycopersicon , biology , arginine decarboxylase , nicotiana benthamiana , chemistry , biochemistry , horticulture , ethylene , enzyme , rna , gene , catalysis

We have investigated the arginine decarboxylase (ADC, EC 4.1.1.19) and ornithine decarboxylase (ODC, EC 4.1.1.17) activities and the levels of conjugated polyamines to explain the decrease of free putrescine level caused by citrus exocortis viroid (CEVd) and ethephon treatment in tomato (Lycopersicon esculentum Mill. cv Rutgers) plants (J.M. Belles, J. Carbonell, V. Conejero [1991] Plant Physiol 96: 1053-1059). This decrease correlates with a decrease in ODC activity in CEVd-infected or ethephon-treated plants; ADC activity was not altered. CEVd infection had no effect on polyamine conjugates, and ethephon produced a decrease in putrescine conjugates. Interference with ethylene action by silver ions prevented the decrease in ODC activity and in free and conjugated putrescine. It is suggested that changes in putrescine level after CEVd infection and ethephon treatment are regulated via ODC activity and that conjugation is not involved.

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