Journal of Stress Physiology & Biochemistry, Vol. 2, No.
2-4, 2006, pp. 4-9
Original Text Copyright (cc) 2006 by Еprintsev, Fedorina
ORIGINAL
ARTICLE
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QueryDate : 2016-12-24
Cites : 2 + 4
FUNCTION OF
MALATDEHYDROGENASE COMPLEX OF MAIZE
MESOPHYLL AND BUNDLE SHEATH CELLS UNDER SALT STRESS CONDITION
Еprintsev А.Т., Fedorina О.S.
Voronezh State
University, Voronezh.
394006, Voronezh, University square, 1, Voronezh State University.
Russia fax: (4732) 20-87-55, e-mail: bc366@bio.vsu.ru
Received March 6, 2006
Abstract - Salt-induced changes in
malatdehydrogenase system activity
make the essential contribution to cell adaptation to stress condition.
The enzyme systems of C4-plants are most interesting due to their
ability for adaptation to environment conditions. The role of separate
components of malatdehydrogenase complex of mesophyll and bundle sheath
cells of corn in formation of adaptive reaction in stressful conditions
is investigated in presented work. The activation of all enzymes of
malatdehydrogenase system and the subsequent decrease in their activity
was observed in mesophyll durring the first stage of adaptation to salt
influence. In bundle sheath cells such parameters are differed from
control less essentially. Fast accumulation of piruvate in cells and
malate in both investigated tissues was induced. The further salinity
led to falling of concentration this intermediate. The concentration of
piruvate was below control level, and it was raised by the end of an
exposition. The results show that sodium chloride causes induction of
Krebs-cycle in mesophyll and bundle sheath cells of corn and
intensification of Hatch-Slack cycle. The described differences in
function malatdehydrogenase systems of mesophyll and bundle sheath
cells of leaves of corn under salinity mainly consist of the activity
of enzymes of a studied complex in bundle sheath cells is subject to
the minimal changes in comparison with mesophyll. Role of this enzyme
system in mechanisms of adaptive reaction of various tissues of corn to
salt stress is discussed.
