NDLI: The Activity of the Peroxidase System in the Course of Stress-Induced CAM Development

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Russian Journal of Plant Physiology : Volume 49, Issue 4, July 2002

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Russian Journal of Plant Physiology : Volume 47

The Activity of the Peroxidase System in the Course of Stress-Induced CAM Development

Content Provider	Springer Nature Link
Author	Shevyakova, N. I. Stetsenko, L. A. Meshcheryakov, A. B. Kuznetsov, Vl. V.
Copyright Year	2002
Abstract	The activity of the peroxidase system in Mesembryanthemum crystallinum L. plants in relation to the shift from C$_{3}$ to CAM photosynthesis was studied. In detached leaves of the fourth and fifth stories treated with NaCl (0.3 M), a rapid (after 30 min) transient induction of the ionically bound peroxidase (the first maximum) was observed followed by a second weak increase in the enzyme activity (90 min after salt treatment). In the leaves of intact plants, which received a longer treatment with NaCl, a two-phase change in the enzyme activity was also observed. It was most pronounced at the early stages of the NaCl-induced plant shift from C$_{3}$ to CAM photosynthesis. In this case, in both detached and intact leaves of juvenile plants, the activity of soluble peroxidase was at a low steady-state level. The situation changed dramatically when M. crystallinum plants transitioned to the reproductive developmental phase and photosynthesis switched from C$_{3}$ to CAM. The time dependence of the activities of both peroxidase types, the soluble ones in particular, was characterized by marked diurnal oscillations (light–dark), which coincided with the fluctuations of the total titratable acidity. In this case, the activity of the soluble enzyme was several orders of magnitude higher than the activity of the ionically bound peroxidase, even though the optimum pH for both isoforms was similar (pH 5.0). Three acid isoforms of soluble peroxidases, which operated more actively when the cytoplasm had a higher acidity, were distinguished by isoelectrofocusing. Their activity increased under salinity. Alkaline and neutral components were predominant in more than 30 molecular forms of the soluble peroxidase detected. We concluded that the operation of the peroxidase system changed substantially when plants shifted from the juvenile to the reproductive state and switched from C$_{3}$ to CAM photosynthesis: the activity of stress-induced ionically bound peroxidase was drastically inhibited with a concurrent increase in the activity of soluble peroxidase and a change in the spectrum of its molecular forms.
Starting Page	598
Ending Page	604
Page Count	7
File Format	PDF
ISSN	10214437
Journal	Russian Journal of Plant Physiology
Volume Number	49
Issue Number	5
e-ISSN	16083407
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Plant Science

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