Photosynthetica 1999, 36(1):243-251 | DOI: 10.1023/A:1007051711355

Effects of Micropropagation Conditions of Rose Shootlets on Chlorophyll Fluorescence

C. Genoud1, A. Coudret1, C. Amalric1, H. Sallanon1
1 Laboratoire de Physiologie et Biotechnologies Végétales, Aubière Cedex, France

Rosa hybrida plantlets were rooted on solid sucrosed medium (MS) under an irradiance (PPFD) of 45 μmol m-2 s-1 or on liquid hydroponic solution (MH) at 100 μmol m-2 s-1. Then all plantlets were acclimated without sucrose under 100 μmol m-2 s-1 PPFD. After 7 d in rooting stage, the ratio of variable over maximal chlorophyll fluorescence (Fv/Fm) was significantly higher for plants grown in MH than in MS and hence the higher irradiance at this stage of growth had no photoinhibitory effect. The radiant energy was used by the photochemical process and also by photoprotective mechanisms of photosystem 2, expressed by increases in the rates of electron flux, net photosynthesis, and non-photochemical quenching. This effect on Fv/Fm was maintained during three weeks in acclimation phase. The resistance of plantlets increased as new leaves formed, and after six weeks in acclimation, there was no difference between the two conditions. The study under higher irradiance (100, 150, or 300 μmol m-2 s-1) indicated that photoinhibition might take place at 300 μmol m-2 s-1 whatever the growth conditions.

Additional key words: acclimation; Fv, Fm; irradiance; net photosynthetic rate; nonphotochemical quenching; rooting; Rosa hybrida

Published: June 1, 1999  Show citation

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Genoud, C., Coudret, A., Amalric, C., & Sallanon, H. (1999). Effects of Micropropagation Conditions of Rose Shootlets on Chlorophyll Fluorescence. Photosynthetica, 36(1-2), 243-251. doi: 10.1023/A:1007051711355
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