biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 45:189-195, 2002 | DOI: 10.1023/A:1015180219628

Impact of in vitro Cultivation Conditions on Stress Responses and on Changes in Thylakoid Membrane Proteins and Pigments of Tobacco during ex vitro Acclimation

P. Hofman1, D. Haisel1, J. Komenda2, M. Vágner1, I. Tichá3, C. Schäfer4, V. Čapková1
1 Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 6, Czech Republic
2 Institute of Microbiology, Academy of Sciences of the Czech Republic, Třeboň, Czech Republic
3 Praha 2, Czech Republic
4 Lehrstuhl für Pflanzenphysiologie, Universität Bayreuth, Bayreuth, Germany

Four physiologically and phenotypically diversified tobacco (Nicotiana tabacum L. cv. Samsun) plantlet variants had been generated by cultivation on media either lacking or containing sucrose (0 and 3 %, m/v) under two different photon flux densities (PFD), 50 µmol m-2 s-1 (LL) and 200 µmol m-2 s-1 (HL). Plantlets were transferred into soil without any pre-acclimation and grown either under PFD of 200 µmol m-2 s-1 or 700 µmol m-2 s-1. Sucrose feeding in vitro resulted in reduced degree and duration of wilting after transfer. The highest readiness for ex vitro acclimation was found in 3 % HL plants, in which changes of photosynthetic apparatus and stress responses were the smallest. On the contrary, the steepest decline of Fv/Fm ratio on the first day after transplantation, doubled chlorophyll content and almost tripled D1/LHC 2 ratio after 7 d of ex vitro growth under 700 µmol m-2 s-1 characterized 0 % HL plants, which had suffered chronic photoinhibition in vitro. Remarkably high abscisic acid content at the end of in vitro cultivation and during acclimation as well as increased synthesis of both D1 and LHC 2 proteins even at the end of analyzed acclimation period were found only in 0 % LL plants. Increase of D1/LHC 2 ratio and chlorophyll contents demonstrate that in vitro developed leaves of all plant variants are able to acclimate to new environment. The most surprising result in the whole study is the drop of D1 protein synthesis in all plants on the 3rd day. Five times decline of photoprotection level of xanthophylls in plants after ex vitro transfer into the same PFD showed stress character of in vitro cultures.

Keywords: abscisic acid; chlorophyll; D1 protein; fluorescence; Nicotiana tabacum; photoautotrophy; photoinhibition; photomixotrophy; stress; xanthophyll cycle
Subjects: abscisic acid; acclimation from in vitro to ex vitro culture; chlorophyll, in vitro cultivation conditions; fluorescence, chlorophyll, in vitro cultivation conditions; high-irradiance stress; in vitro culture, ex vitro acclimation, rooting; Nicotiana tabacum; photochemical activities; photoinhibition; photon flux density; photosystem 2, photochemical activity; thylakoid membrane proteins, in vitro cultivation ,conditions; tobacco, in vitro cultivation conditions; xanthophyll cycle

Published: June 1, 2002  Show citation

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Hofman, P., Haisel, D., Komenda, J., Vágner, M., Tichá, I., Schäfer, C., & Čapková, V. (2002). Impact of in vitro Cultivation Conditions on Stress Responses and on Changes in Thylakoid Membrane Proteins and Pigments of Tobacco during ex vitro Acclimation. Biologia plantarum, 45(2), 189-195. doi: 10.1023/A:1015180219628
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