Major rhythms modulation during Arabidopsis thaliana floral stem growth
Jouve, L., Greppin, H., Degli Agosti, R.
Plant Physiology and Biochemistry Laboratory, University of Geneva, 3 place de l'Université, CH-1211 Geneva 4, Switzerland.
Floral stem extension rate (FSER) of Arabidopsis thaliana Landsberg erecta ecotypes was studied. Elongation was measured in L:D (7:7) by the LVDT (Linear Voltage Differential Transformer) method. It appeared that two major FSER oscillations could be detected: a first one with maxima during the light period and a second one with maxima during the dark span period. These oscillations are, in some way, probably independent because in homogenous populations (clone, synchronised for flowering time initiation) and standard environmental measurement conditions the physiological FSER could be clearly separated in two distinct classes. In 79.2 %, dark FSER oscillation have lower maxima than light oscillations. The other remaining 20.8 % showed, after the middle of the whole stem growth period, greater maxima during dark span than during light. It also appeared that the rosette was aproximatively 1.5 time bigger in the second case. This suggest that, in an homogenous clone population, and in the same environmental conditions, the amplitudes of the FSER rhythms could be modulated according to the importance of the vegetative part of the plant.
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