Photosynthetica 2001, 39(1):67-73 | DOI: 10.1023/A:1012443919022

The Effect of In Vitro Culture Conditions on the Pattern of Photoinhibition during Acclimation of Gardenia Plantlets to Ex Vitro Conditions

M.D. Serret1, M.I. Trillas1, J.L. Araus1
1 Unitat de Fisiologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain

We tested the effect of growing conditions during micropropagation on the fast kinetics of chlorophyll (Chl) fluorescence of Gardenia jasminoides Ellis plantlets during a 4-week acclimation to ex vitro. We studied whether photoautotrophic growing in vitro produced plantlets with less photoinhibition impairment during acclimation. Of the growing conditions stimulating photoautotrophy in vitro, only loose tube caps had a positive effect, whereas low sucrose or sucrose-free content in the medium and high PPFD showed a negative effect. Thus, plantlets cultured with 3 % (m/v) of sucrose were subsequently less photoinhibited throughout acclimation than those cultured with low sucrose (0.5 %) or sucrose-free media. Moreover, at the end of acclimation the former plantlets showed Fv/Fm and Fv/F0 ratios typical of unstressed ex vitro plants as well as a higher Chl content and ratio of Chls to carotenoids. Plantlets cultured at a photosynthetic photon fluence density (PPFD) of 50 µmol m-2 s-1 also showed a better performance at the end of acclimation than those cultured at a higher (110 µmol m-2 s-1) PPFD. Thus except in the case of loose-tube closure, gardenia plantlets cultured in vitro under conventional sucrose concentration and PPFD are the least photoinhibited during acclimation. Nevertheless, significant interactions between the in vitro growing factors were observed at the end of acclimation.

Additional key words: carotenoids; chlorophylls; CO2; fluorescence induction; Gardenia jasminoides; irradiance; micropropagation; photosynthetic pigments; saccharose

Published: March 1, 2001  Show citation

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Serret, M.D., Trillas, M.I., & Araus, J.L. (2001). The Effect of In Vitro Culture Conditions on the Pattern of Photoinhibition during Acclimation of Gardenia Plantlets to Ex Vitro Conditions. Photosynthetica39(1), 67-73. doi: 10.1023/A:1012443919022
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