Journal of Stress Physiology & Biochemistry, Vol. 2, No. 1,
2006, pp. 16-20.
Original Text Copyright (cc) 2006 by Sofronova, Chepalov, Petrov
ORIGINAL
ARTICLE
Data source : Google Scholar
QueryDate : 2016-12-24
Cites : 0 + 1
CAROTENOID
INVOLVEMENT IN THE REGULATION OF Spirodela
polyrhiza (L.) Schleid RESISTANCE TO COLD SHOCK
Sofronova V.E., Chepalov V.A.,
Petrov K.A.
Plant
Physiology Group, Institute for
Biological Problems of Cryolithozone SD RAS, 677980 Yakutsk, Russia e-mail: v_e_sofronova@ibpc.ysn.ru
Received November 21, 2005
Abstract - Effect of short-time (15
sec, 5, 15, 30 min) cold stress
(0,1-0,2oC) at 0,1 μmol photons м-2 s-1 over the Spirodela polyrhiza
(L.) Schleid carotenoid composition cultivated under the laboratory
conditions has been studied. It is found that the sum of carotenoid
pigments of Spirodela polyrhiza (L.) does not change and averages 206,9
± 11,5 mkg/g in fresh weight. Pool increase of lutein+zeaxanthin (by
5-8%) has been observed in response to a short-time Spirodela polyrhiza
cooling with simultaneous decrease of violaxanthin content (by 16%).
Violaxanthin de-epoxidation occurs in the minute time spans and the
depth of conversion does not depend on the cold shock duration. The
data obtained indicate that pigments of the violaxanthin cycle may
participate in realization of transitory emergency protection systems
of photosynthetic apparatus by increasing the share of thermal energy
dissipation of the absorbed light and preventing singlet oxygen
formation.
