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Effect of EGTA on the diurnal leaf movement of Phaseolus vulgaris

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Published in Plant Physiology and Biochemistry. 1997, vol. 35, p. 915-922
Abstract The synchronized 12:12 h (L:D) primary leaf movement of Phaseolus vulgaris was profoundly altered by a calcium chelator (EGTA 10 mM). This effect depended strongly on the phase at which this chemical was administered. When EGTA was sprayed on the leaf 8 h after lights-on the upward movement was advanced by 3-6 h. At a critical time point in the middle of the night, (around 17 h after the light-on, 5 h after light-off respectively) EGTA suppressed circadian rhythmicity and promoted an ultradian rhythm. The period of this ultradian rhythm was significantly longer (4.04 ± 0.09 h) in light than in darkness (3 .20 ± 0.13 h), and the amplitude was also higher in light than in darkness.
Keywords CalciumCircadian rhythmEGTALeaf movementPhaseolus vulgarisRhythmUltradian
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KAYALI, Saad, GREPPIN, Hubert, DEGLI AGOSTI, Robert. Effect of EGTA on the diurnal leaf movement of Phaseolus vulgaris. In: Plant Physiology and Biochemistry, 1997, vol. 35, p. 915-922. https://archive-ouverte.unige.ch/unige:42720

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Deposited on : 2014-12-08

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